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#1
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Whats the deal with 24pin ATX PSU connectors
I have just bought a Ultra Xconnect power supply 400watts to use in
conjunction with a AMD 3500+ and skt 939 board. Here it is: http://www.ultraproducts.com/product...roductID=3 04 It says it supports Pentium 4 and AMD CPUs and meets ATX version 2.03 and ATX 12V version 1.2 specification. When I bought it I thought it was the dogs ******** but now I see motherboards with 24 pin PSU connectors and wonder what's going on. Have I bought a lemon? Is it out of date? Has the ATX spec moved on? Can you plug a 20pin ATX connector from the power supply onto a 24pin connector on the motherboard and then use a 4 pin lead for the remaining 4 pins or would I need a convertor? The motherboard I want to use it with has the following connectors: 24-pin ATX Power connector 4-pin ATX 12V Power connector Would I need to buy extra cables / convertors to use it with this board? Thanks Pete |
#2
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Whats the deal with 24pin ATX PSU connectors
Pete wrote:
I have just bought a Ultra Xconnect power supply 400watts to use in conjunction with a AMD 3500+ and skt 939 board. Here it is: http://www.ultraproducts.com/product...roductID=3 04 It says it supports Pentium 4 and AMD CPUs and meets ATX version 2.03 and ATX 12V version 1.2 specification. When I bought it I thought it was the dogs ******** but now I see motherboards with 24 pin PSU connectors and wonder what's going on. Have I bought a lemon? Is it out of date? Has the ATX spec moved on? Can you plug a 20pin ATX connector from the power supply onto a 24pin connector on the motherboard and then use a 4 pin lead for the remaining 4 pins or would I need a convertor? The motherboard I want to use it with has the following connectors: 24-pin ATX Power connector 4-pin ATX 12V Power connector Would I need to buy extra cables / convertors to use it with this board? Thanks Pete 20 + 4 = 24, or so the manufacturer suggests. It appears that you are expected to use the standard 20-pin cable plus the 4-pin "P4" connector to do the job. -- John McGaw [Knoxville, TN, USA] http://johnmcgaw.com |
#3
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Whats the deal with 24pin ATX PSU connectors
In article , "Pete"
wrote: I have just bought a Ultra Xconnect power supply 400watts to use in conjunction with a AMD 3500+ and skt 939 board. Here it is: http://www.ultraproducts.com/product...roductID=3 04 It says it supports Pentium 4 and AMD CPUs and meets ATX version 2.03 and ATX 12V version 1.2 specification. When I bought it I thought it was the dogs ******** but now I see motherboards with 24 pin PSU connectors and wonder what's going on. Have I bought a lemon? Is it out of date? Has the ATX spec moved on? Can you plug a 20pin ATX connector from the power supply onto a 24pin connector on the motherboard and then use a 4 pin lead for the remaining 4 pins or would I need a convertor? The motherboard I want to use it with has the following connectors: 24-pin ATX Power connector 4-pin ATX 12V Power connector Would I need to buy extra cables / convertors to use it with this board? Thanks Pete ----- ATX 2.0+ main connector ----- --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 +3.3VDC Orange 13 +3.3VDC Orange 1 +3.3VDC Orange 11 +3.3VDC Orange 2 +3.3VDC Orange 14 -12VDC Blue 2 +3.3VDC Orange 12 -12VDC Blue 3 COM Black 15 COM Black 3 COM Black 13 COM Black 4 +5VDC Red 16 PS_ON# Green 4 +5VDC Red 14 PS_ON# Green 5 COM Black 17 COM Black 5 COM Black 15 COM Black 6 +5VDC Red 18 COM Black 6 +5VDC Red 16 COM Black 7 COM Black 19 COM Black 7 COM Black 17 COM Black 8 PWR_OK Gray 20 Reserved N/C 8 PWR_OK Gray 18 Reserved N/C (-5V) 9 +5VSB Purple 21 +5VDC Red 9 +5VSB Purple 19 +5VDC Red 10 +12V1DC Yellow 22 +5VDC Red 10 +12VDC Yellow 20 +5VDC Red 11 +12V1DC Yellow 23 +5VDC Red 12 +3.3 VDC Orange 24 COM Black --- ATX 2.0+ 12V for proc ------ --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 COM Black 3 +12V2DC Yellow/Black 1 COM Black 3 +12VDC Yellow 2 COM Black 4 +12V2DC Yellow/Black 2 COM Black 4 +12VDC Yellow Changes: 1) -5V removed, prev supplies probably had it. Usually not an issue. 2) Four addition pins on main connector. Extra +3.3V, +5V, +12V, GND Helps with PCI Express motherboards. For SLI boards, 24 pin recommended (to get two 6 amp pins to feed the two video cards via PCI Express slot connectors). For single video card, 20 pin is generally enough. 6600GT for example, draws 4 amps. Xbitlabs.com has measured many cards. If in doubt, do a detailed calculation. 3) 12V output split into two separate 12V circuits. No advantage to customer, due to need to allocate extra "slack" when buying. Perhaps intended to meet IEC60950 ? (To limit max power per 12V output) 12V1 feeds disks and motherboard (and video card) 12V2 used exclusively for processor (in your computer, that would be 8.24A) * 24 pin can plug to 20 pin mobo, as long as pins don't bump 20 pin can plug to 24 pin mobo (same pinout) - use the right holes. Some 24 pin are detachable, into a 20 pin part and a detached 4 pin part. At least one guy has managed to plug the detached 4 pin, into the processor Vcore input. (I haven't checked to see how hard that is to do.) PCI Express slots have 12V pins on them and allow up to 5 amps. Video cards (not overclocked) seem to be designed to draw about 4 amps or a tiny bit more, through the PCI Express x16 slot. The single 12V wire on the 20 pin connector carries at least 6 amps, so using a 20 pin connector on a non-SLI board seems reasonable. The fan header current also flows through the single 12V pin on the 20 pin connector. Main connector rated for 6 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=98716 12V processor power connect pins rated at 8 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=76873 Molex disk drive connector rated at 8 amps per pin (based on assuming a right angle PCB mount connector, and 18 gauge wire - Amp 82181 catalog) Enjoy your new power supply. No need for adapters. The Ultra you have selected, has 12V @ 16A. If you had an 89W AMD processor, that is (89W/12V)/0.90 = 8.24A. A midrange video card like 6600GT is 4A. That is 12.24 amps so far. A disk drive idles at 0.5A. A CDROM can draw 1.5A according to the rating on the label. Allocate 0.5A for some fans. We are now at 14.74 amps of 16A. Your new Ultra is suitable for a midrange gamer with minimal storage devices. More than 16 amps is required if your PC has more toys in it. For example, if you bought an ATI X1900XTX, it draws 10 amps (part through the PCI Express slot, part through the 2x3 PCI Express connector), and you would need about 12V @ 23A to have a stable computer. So, enjoy your new Ultra, but do not overload it. HTH, Paul |
#4
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Whats the deal with 24pin ATX PSU connectors
John McGaw wrote:
" 20 + 4 = 24, or so the manufacturer suggests. It appears that you are expected to use the standard 20-pin cable plus the 4-pin "P4" connector to do the job. " I'd like to see you try that one. A few years ago motherboards only needed a 20-pin connector. The 4-pin 12V connector then became necessary for the Pentium 4. AMD eventually caught up with its use of the 4-pin connector, yet it is still often known today as a "P4 connector". Then, with the introduction of PCI-Express chipsets, motherboards began to need separation of the 12V rails through the main connector, so a 24-pin connector was introduced to replace the 20-pin one. You will often see PSUs advertised as having a 20-pin and a 4-pin connector, which usually means a 20-pin main connector and a 4-pin 12V "P4" connector. You also see some advertised as having a 20+4-pin connector. You can't take the 4-pin "P4" connector and fill up the missing slots on a 24-pin socket. Not only will it not fit (unless considerably forced), but you will invariably need to plug in the 4-pin connector elsewhere on the motherboard anywhere. When you see a PSU advertised as 20+4-pin, it usually means that it has a snap-away connector for use with either a 20-pin or a 24-pin main socket. The 4-pin part here is not the same as the 4-pin "P4" connector. You can see one of these 20+4-pin connectors he http://www.highpowersupply.com/icon/20+4main2.jpg This quide from November 2005 explains it all a bit further, but came before the introduction of the new 8-pin 12V connector. http://tomshardware.co.uk/2005/11/23...uk/page19.html Most motherboards will soon move on from the 4-pin 12V connector to the new 8-pin 12V connector. Like many new motherboards, this Gigabyte GA-965P-DQ6 will need both a 24-pin main connector and an 8-pin 12V connector. http://www.hexus.net/content/item.php?item=6233&page=4 You can get 20-to-24-pin adapters and 4-to-8-pin adapters, but there is no guarantee that either will be able to supply a stable draw along the new rail splits. http://www.newegg.com/Product/Produc...82E16812183045 Some motherboards don't like them, so you are invariably better off with a PSU that handles the relevant splits itself. |
#5
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Whats the deal with 24pin ATX PSU connectors
Paul wrote:
In article , "Pete" wrote: I have just bought a Ultra Xconnect power supply 400watts to use in conjunction with a AMD 3500+ and skt 939 board. Here it is: http://www.ultraproducts.com/product...roductID=3 04 It says it supports Pentium 4 and AMD CPUs and meets ATX version 2.03 and ATX 12V version 1.2 specification. When I bought it I thought it was the dogs ******** but now I see motherboards with 24 pin PSU connectors and wonder what's going on. Have I bought a lemon? Is it out of date? Has the ATX spec moved on? Can you plug a 20pin ATX connector from the power supply onto a 24pin connector on the motherboard and then use a 4 pin lead for the remaining 4 pins or would I need a convertor? The motherboard I want to use it with has the following connectors: 24-pin ATX Power connector 4-pin ATX 12V Power connector Would I need to buy extra cables / convertors to use it with this board? Thanks Pete ----- ATX 2.0+ main connector ----- --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 +3.3VDC Orange 13 +3.3VDC Orange 1 +3.3VDC Orange 11 +3.3VDC Orange 2 +3.3VDC Orange 14 -12VDC Blue 2 +3.3VDC Orange 12 -12VDC Blue 3 COM Black 15 COM Black 3 COM Black 13 COM Black 4 +5VDC Red 16 PS_ON# Green 4 +5VDC Red 14 PS_ON# Green 5 COM Black 17 COM Black 5 COM Black 15 COM Black 6 +5VDC Red 18 COM Black 6 +5VDC Red 16 COM Black 7 COM Black 19 COM Black 7 COM Black 17 COM Black 8 PWR_OK Gray 20 Reserved N/C 8 PWR_OK Gray 18 Reserved N/C (-5V) 9 +5VSB Purple 21 +5VDC Red 9 +5VSB Purple 19 +5VDC Red 10 +12V1DC Yellow 22 +5VDC Red 10 +12VDC Yellow 20 +5VDC Red 11 +12V1DC Yellow 23 +5VDC Red 12 +3.3 VDC Orange 24 COM Black --- ATX 2.0+ 12V for proc ------ --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 COM Black 3 +12V2DC Yellow/Black 1 COM Black 3 +12VDC Yellow 2 COM Black 4 +12V2DC Yellow/Black 2 COM Black 4 +12VDC Yellow Changes: 1) -5V removed, prev supplies probably had it. Usually not an issue. 2) Four addition pins on main connector. Extra +3.3V, +5V, +12V, GND Helps with PCI Express motherboards. For SLI boards, 24 pin recommended (to get two 6 amp pins to feed the two video cards via PCI Express slot connectors). For single video card, 20 pin is generally enough. 6600GT for example, draws 4 amps. Xbitlabs.com has measured many cards. If in doubt, do a detailed calculation. 3) 12V output split into two separate 12V circuits. No advantage to customer, due to need to allocate extra "slack" when buying. Perhaps intended to meet IEC60950 ? (To limit max power per 12V output) 12V1 feeds disks and motherboard (and video card) 12V2 used exclusively for processor (in your computer, that would be 8.24A) * 24 pin can plug to 20 pin mobo, as long as pins don't bump 20 pin can plug to 24 pin mobo (same pinout) - use the right holes. Some 24 pin are detachable, into a 20 pin part and a detached 4 pin part. At least one guy has managed to plug the detached 4 pin, into the processor Vcore input. (I haven't checked to see how hard that is to do.) PCI Express slots have 12V pins on them and allow up to 5 amps. Video cards (not overclocked) seem to be designed to draw about 4 amps or a tiny bit more, through the PCI Express x16 slot. The single 12V wire on the 20 pin connector carries at least 6 amps, so using a 20 pin connector on a non-SLI board seems reasonable. The fan header current also flows through the single 12V pin on the 20 pin connector. Main connector rated for 6 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=98716 12V processor power connect pins rated at 8 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=76873 Molex disk drive connector rated at 8 amps per pin (based on assuming a right angle PCB mount connector, and 18 gauge wire - Amp 82181 catalog) Enjoy your new power supply. No need for adapters. The Ultra you have selected, has 12V @ 16A. If you had an 89W AMD processor, that is (89W/12V)/0.90 = 8.24A. A midrange video card like 6600GT is 4A. That is 12.24 amps so far. A disk drive idles at 0.5A. A CDROM can draw 1.5A according to the rating on the label. Allocate 0.5A for some fans. We are now at 14.74 amps of 16A. Your new Ultra is suitable for a midrange gamer with minimal storage devices. More than 16 amps is required if your PC has more toys in it. For example, if you bought an ATI X1900XTX, it draws 10 amps (part through the PCI Express slot, part through the 2x3 PCI Express connector), and you would need about 12V @ 23A to have a stable computer. So, enjoy your new Ultra, but do not overload it. HTH, Paul Thanks for the detailed reply Paul. Just to confirm what you have said: 1. Plug the 20 pin ATX motherboard power cable into the 24pin socket on the MB then... Sorry to be thick Thanks Pete |
#6
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Whats the deal with 24pin ATX PSU connectors
Pete wrote:
Paul wrote: In article , "Pete" wrote: I have just bought a Ultra Xconnect power supply 400watts to use in conjunction with a AMD 3500+ and skt 939 board. Here it is: http://www.ultraproducts.com/product...roductID=3 04 It says it supports Pentium 4 and AMD CPUs and meets ATX version 2.03 and ATX 12V version 1.2 specification. When I bought it I thought it was the dogs ******** but now I see motherboards with 24 pin PSU connectors and wonder what's going on. Have I bought a lemon? Is it out of date? Has the ATX spec moved on? Can you plug a 20pin ATX connector from the power supply onto a 24pin connector on the motherboard and then use a 4 pin lead for the remaining 4 pins or would I need a convertor? The motherboard I want to use it with has the following connectors: 24-pin ATX Power connector 4-pin ATX 12V Power connector Would I need to buy extra cables / convertors to use it with this board? Thanks Pete ----- ATX 2.0+ main connector ----- --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 +3.3VDC Orange 13 +3.3VDC Orange 1 +3.3VDC Orange 11 +3.3VDC Orange 2 +3.3VDC Orange 14 -12VDC Blue 2 +3.3VDC Orange 12 -12VDC Blue 3 COM Black 15 COM Black 3 COM Black 13 COM Black 4 +5VDC Red 16 PS_ON# Green 4 +5VDC Red 14 PS_ON# Green 5 COM Black 17 COM Black 5 COM Black 15 COM Black 6 +5VDC Red 18 COM Black 6 +5VDC Red 16 COM Black 7 COM Black 19 COM Black 7 COM Black 17 COM Black 8 PWR_OK Gray 20 Reserved N/C 8 PWR_OK Gray 18 Reserved N/C (-5V) 9 +5VSB Purple 21 +5VDC Red 9 +5VSB Purple 19 +5VDC Red 10 +12V1DC Yellow 22 +5VDC Red 10 +12VDC Yellow 20 +5VDC Red 11 +12V1DC Yellow 23 +5VDC Red 12 +3.3 VDC Orange 24 COM Black --- ATX 2.0+ 12V for proc ------ --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 COM Black 3 +12V2DC Yellow/Black 1 COM Black 3 +12VDC Yellow 2 COM Black 4 +12V2DC Yellow/Black 2 COM Black 4 +12VDC Yellow Changes: 1) -5V removed, prev supplies probably had it. Usually not an issue. 2) Four addition pins on main connector. Extra +3.3V, +5V, +12V, GND Helps with PCI Express motherboards. For SLI boards, 24 pin recommended (to get two 6 amp pins to feed the two video cards via PCI Express slot connectors). For single video card, 20 pin is generally enough. 6600GT for example, draws 4 amps. Xbitlabs.com has measured many cards. If in doubt, do a detailed calculation. 3) 12V output split into two separate 12V circuits. No advantage to customer, due to need to allocate extra "slack" when buying. Perhaps intended to meet IEC60950 ? (To limit max power per 12V output) 12V1 feeds disks and motherboard (and video card) 12V2 used exclusively for processor (in your computer, that would be 8.24A) * 24 pin can plug to 20 pin mobo, as long as pins don't bump 20 pin can plug to 24 pin mobo (same pinout) - use the right holes. Some 24 pin are detachable, into a 20 pin part and a detached 4 pin part. At least one guy has managed to plug the detached 4 pin, into the processor Vcore input. (I haven't checked to see how hard that is to do.) PCI Express slots have 12V pins on them and allow up to 5 amps. Video cards (not overclocked) seem to be designed to draw about 4 amps or a tiny bit more, through the PCI Express x16 slot. The single 12V wire on the 20 pin connector carries at least 6 amps, so using a 20 pin connector on a non-SLI board seems reasonable. The fan header current also flows through the single 12V pin on the 20 pin connector. Main connector rated for 6 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=98716 12V processor power connect pins rated at 8 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=76873 Molex disk drive connector rated at 8 amps per pin (based on assuming a right angle PCB mount connector, and 18 gauge wire - Amp 82181 catalog) Enjoy your new power supply. No need for adapters. The Ultra you have selected, has 12V @ 16A. If you had an 89W AMD processor, that is (89W/12V)/0.90 = 8.24A. A midrange video card like 6600GT is 4A. That is 12.24 amps so far. A disk drive idles at 0.5A. A CDROM can draw 1.5A according to the rating on the label. Allocate 0.5A for some fans. We are now at 14.74 amps of 16A. Your new Ultra is suitable for a midrange gamer with minimal storage devices. More than 16 amps is required if your PC has more toys in it. For example, if you bought an ATI X1900XTX, it draws 10 amps (part through the PCI Express slot, part through the 2x3 PCI Express connector), and you would need about 12V @ 23A to have a stable computer. So, enjoy your new Ultra, but do not overload it. HTH, Paul Thanks for the detailed reply Paul. Just to confirm what you have said: 1. Plug the 20 pin ATX motherboard power cable into the 24pin socket on the MB then... Sorry to be thick Thanks Pete Sorry Paul, I just noticed that the spec on the side of the box is different to the spec on their website. This is what it says on the box, is this better for me or worse? Thanks Pete +3.3VDC=16A +5vDC=30A +12vdc=19A 228W -12vdc=0.6A -5vdc=0.6A +5vsb=2.0A +3.3V AC INPUT 115V/230V 10A/6A 60/50Hz DC OUTPUT +3.3V +5V +12V -12V -5V +5VSB 500W Max Combined Watts 28A 30A 34A 0.8A 0.3A 2A 500W |
#7
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Whats the deal with 24pin ATX PSU connectors
Cuzman wrote:
John McGaw wrote: " 20 + 4 = 24, or so the manufacturer suggests. It appears that you are expected to use the standard 20-pin cable plus the 4-pin "P4" connector to do the job. " I'd like to see you try that one. A few years ago motherboards only needed a 20-pin connector. The 4-pin 12V connector then became necessary for the Pentium 4. AMD eventually caught up with its use of the 4-pin connector, yet it is still often known today as a "P4 connector". Then, with the introduction of PCI-Express chipsets, motherboards began to need separation of the 12V rails through the main connector, so a 24-pin connector was introduced to replace the 20-pin one. You will often see PSUs advertised as having a 20-pin and a 4-pin connector, which usually means a 20-pin main connector and a 4-pin 12V "P4" connector. You also see some advertised as having a 20+4-pin connector. You can't take the 4-pin "P4" connector and fill up the missing slots on a 24-pin socket. Not only will it not fit (unless considerably forced), but you will invariably need to plug in the 4-pin connector elsewhere on the motherboard anywhere. When you see a PSU advertised as 20+4-pin, it usually means that it has a snap-away connector for use with either a 20-pin or a 24-pin main socket. The 4-pin part here is not the same as the 4-pin "P4" connector. You can see one of these 20+4-pin connectors he http://www.highpowersupply.com/icon/20+4main2.jpg This quide from November 2005 explains it all a bit further, but came before the introduction of the new 8-pin 12V connector. http://tomshardware.co.uk/2005/11/23...uk/page19.html Most motherboards will soon move on from the 4-pin 12V connector to the new 8-pin 12V connector. Like many new motherboards, this Gigabyte GA-965P-DQ6 will need both a 24-pin main connector and an 8-pin 12V connector. http://www.hexus.net/content/item.php?item=6233&page=4 You can get 20-to-24-pin adapters and 4-to-8-pin adapters, but there is no guarantee that either will be able to supply a stable draw along the new rail splits. http://www.newegg.com/Product/Produc...82E16812183045 Some motherboards don't like them, so you are invariably better off with a PSU that handles the relevant splits itself. Yes. You are right. I went back and looked at the actual power supply in question and see that what I took as the "snap on" connector clearly isn't. Oh well, that is what happens when I jump in... I guess that in this case one of the 20 - 24 adapters might be the next logical thing for the OP to try if a new PS is not in the budget. I've only used them twice, both times on modest MBs, and had no problems. -- John McGaw [Knoxville, TN, USA] http://johnmcgaw.com |
#8
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Whats the deal with 24pin ATX PSU connectors
On Wed, 02 Aug 2006 10:11:06 GMT, "Pete"
wrote: I have just bought a Ultra Xconnect power supply 400watts to use in conjunction with a AMD 3500+ and skt 939 board. Here it is: http://www.ultraproducts.com/product...roductID=3 04 It says it supports Pentium 4 and AMD CPUs and meets ATX version 2.03 and ATX 12V version 1.2 specification. When I bought it I thought it was the dogs ******** but now I see motherboards with 24 pin PSU connectors and wonder what's going on. Have I bought a lemon? Yes, but it has nothing to do with above issue of 24 pins or not. It's a lemon because it's a junk PSU dressed up with frivolous things. This is also why many of them are about $10 after rebate as recurring specials at Radio Shack, etc... but are =500 pseudo-watts instead of 400. If your system has integrated video, a very low powered card, and not too many hard drives, you may find the psu acceptible for the described system. I tend to feel Paul's itemization of power consumption may miss a larger issue, that we'd have to assume the PSU was capable of sustaining that output first, and I mean sustain long term rather than the day (if that) some website reviews try to use when qualifying PSU. |
#9
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Whats the deal with 24pin ATX PSU connectors
In article , "Pete"
wrote: Pete wrote: Paul wrote: In article , "Pete" wrote: I have just bought a Ultra Xconnect power supply 400watts to use in conjunction with a AMD 3500+ and skt 939 board. Here it is: http://www.ultraproducts.com/product...roductID=3 04 It says it supports Pentium 4 and AMD CPUs and meets ATX version 2.03 and ATX 12V version 1.2 specification. When I bought it I thought it was the dogs ******** but now I see motherboards with 24 pin PSU connectors and wonder what's going on. Have I bought a lemon? Is it out of date? Has the ATX spec moved on? Can you plug a 20pin ATX connector from the power supply onto a 24pin connector on the motherboard and then use a 4 pin lead for the remaining 4 pins or would I need a convertor? The motherboard I want to use it with has the following connectors: 24-pin ATX Power connector 4-pin ATX 12V Power connector Would I need to buy extra cables / convertors to use it with this board? Thanks Pete ----- ATX 2.0+ main connector ----- --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 +3.3VDC Orange 13 +3.3VDC Orange 1 +3.3VDC Orange 11 +3.3VDC Orange 2 +3.3VDC Orange 14 -12VDC Blue 2 +3.3VDC Orange 12 -12VDC Blue 3 COM Black 15 COM Black 3 COM Black 13 COM Black 4 +5VDC Red 16 PS_ON# Green 4 +5VDC Red 14 PS_ON# Green 5 COM Black 17 COM Black 5 COM Black 15 COM Black 6 +5VDC Red 18 COM Black 6 +5VDC Red 16 COM Black 7 COM Black 19 COM Black 7 COM Black 17 COM Black 8 PWR_OK Gray 20 Reserved N/C 8 PWR_OK Gray 18 Reserved N/C (-5V) 9 +5VSB Purple 21 +5VDC Red 9 +5VSB Purple 19 +5VDC Red 10 +12V1DC Yellow 22 +5VDC Red 10 +12VDC Yellow 20 +5VDC Red 11 +12V1DC Yellow 23 +5VDC Red 12 +3.3 VDC Orange 24 COM Black --- ATX 2.0+ 12V for proc ------ --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 COM Black 3 +12V2DC Yellow/Black 1 COM Black 3 +12VDC Yellow 2 COM Black 4 +12V2DC Yellow/Black 2 COM Black 4 +12VDC Yellow Changes: 1) -5V removed, prev supplies probably had it. Usually not an issue. 2) Four addition pins on main connector. Extra +3.3V, +5V, +12V, GND Helps with PCI Express motherboards. For SLI boards, 24 pin recommended (to get two 6 amp pins to feed the two video cards via PCI Express slot connectors). For single video card, 20 pin is generally enough. 6600GT for example, draws 4 amps. Xbitlabs.com has measured many cards. If in doubt, do a detailed calculation. 3) 12V output split into two separate 12V circuits. No advantage to customer, due to need to allocate extra "slack" when buying. Perhaps intended to meet IEC60950 ? (To limit max power per 12V output) 12V1 feeds disks and motherboard (and video card) 12V2 used exclusively for processor (in your computer, that would be 8.24A) * 24 pin can plug to 20 pin mobo, as long as pins don't bump 20 pin can plug to 24 pin mobo (same pinout) - use the right holes. Some 24 pin are detachable, into a 20 pin part and a detached 4 pin part. At least one guy has managed to plug the detached 4 pin, into the processor Vcore input. (I haven't checked to see how hard that is to do.) PCI Express slots have 12V pins on them and allow up to 5 amps. Video cards (not overclocked) seem to be designed to draw about 4 amps or a tiny bit more, through the PCI Express x16 slot. The single 12V wire on the 20 pin connector carries at least 6 amps, so using a 20 pin connector on a non-SLI board seems reasonable. The fan header current also flows through the single 12V pin on the 20 pin connector. Main connector rated for 6 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=98716 12V processor power connect pins rated at 8 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=76873 Molex disk drive connector rated at 8 amps per pin (based on assuming a right angle PCB mount connector, and 18 gauge wire - Amp 82181 catalog) Enjoy your new power supply. No need for adapters. The Ultra you have selected, has 12V @ 16A. If you had an 89W AMD processor, that is (89W/12V)/0.90 = 8.24A. A midrange video card like 6600GT is 4A. That is 12.24 amps so far. A disk drive idles at 0.5A. A CDROM can draw 1.5A according to the rating on the label. Allocate 0.5A for some fans. We are now at 14.74 amps of 16A. Your new Ultra is suitable for a midrange gamer with minimal storage devices. More than 16 amps is required if your PC has more toys in it. For example, if you bought an ATI X1900XTX, it draws 10 amps (part through the PCI Express slot, part through the 2x3 PCI Express connector), and you would need about 12V @ 23A to have a stable computer. So, enjoy your new Ultra, but do not overload it. HTH, Paul Thanks for the detailed reply Paul. Just to confirm what you have said: 1. Plug the 20 pin ATX motherboard power cable into the 24pin socket on the MB then... Sorry to be thick Thanks Pete Sorry Paul, I just noticed that the spec on the side of the box is different to the spec on their website. This is what it says on the box, is this better for me or worse? Thanks Pete +3.3VDC=16A +5vDC=30A +12vdc=19A 228W -12vdc=0.6A -5vdc=0.6A +5vsb=2.0A +3.3V AC INPUT 115V/230V 10A/6A 60/50Hz DC OUTPUT +3.3V +5V +12V -12V -5V +5VSB 500W Max Combined Watts 28A 30A 34A 0.8A 0.3A 2A 500W If the link in question is this one, the 34A rating on 12V is plenty. Just plug it in and use it :-) http://www.ultraproducts.com/product...roductID=2 98 HTH, Paul |
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Whats the deal with 24pin ATX PSU connectors
Paul wrote:
In article , "Pete" wrote: Pete wrote: Paul wrote: In article , "Pete" wrote: I have just bought a Ultra Xconnect power supply 400watts to use in conjunction with a AMD 3500+ and skt 939 board. Here it is: http://www.ultraproducts.com/product...roductID=3 04 It says it supports Pentium 4 and AMD CPUs and meets ATX version 2.03 and ATX 12V version 1.2 specification. When I bought it I thought it was the dogs ******** but now I see motherboards with 24 pin PSU connectors and wonder what's going on. Have I bought a lemon? Is it out of date? Has the ATX spec moved on? Can you plug a 20pin ATX connector from the power supply onto a 24pin connector on the motherboard and then use a 4 pin lead for the remaining 4 pins or would I need a convertor? The motherboard I want to use it with has the following connectors: 24-pin ATX Power connector 4-pin ATX 12V Power connector Would I need to buy extra cables / convertors to use it with this board? Thanks Pete ----- ATX 2.0+ main connector ----- --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 +3.3VDC Orange 13 +3.3VDC Orange 1 +3.3VDC Orange 11 +3.3VDC Orange 2 +3.3VDC Orange 14 -12VDC Blue 2 +3.3VDC Orange 12 -12VDC Blue 3 COM Black 15 COM Black 3 COM Black 13 COM Black 4 +5VDC Red 16 PS_ON# Green 4 +5VDC Red 14 PS_ON# Green 5 COM Black 17 COM Black 5 COM Black 15 COM Black 6 +5VDC Red 18 COM Black 6 +5VDC Red 16 COM Black 7 COM Black 19 COM Black 7 COM Black 17 COM Black 8 PWR_OK Gray 20 Reserved N/C 8 PWR_OK Gray 18 Reserved N/C (-5V) 9 +5VSB Purple 21 +5VDC Red 9 +5VSB Purple 19 +5VDC Red 10 +12V1DC Yellow 22 +5VDC Red 10 +12VDC Yellow 20 +5VDC Red 11 +12V1DC Yellow 23 +5VDC Red 12 +3.3 VDC Orange 24 COM Black --- ATX 2.0+ 12V for proc ------ --- ATX previous versions --- Pin Signal Color Pin Signal Color Pin Signal Color Pin Signal Color 1 COM Black 3 +12V2DC Yellow/Black 1 COM Black 3 +12VDC Yellow 2 COM Black 4 +12V2DC Yellow/Black 2 COM Black 4 +12VDC Yellow Changes: 1) -5V removed, prev supplies probably had it. Usually not an issue. 2) Four addition pins on main connector. Extra +3.3V, +5V, +12V, GND Helps with PCI Express motherboards. For SLI boards, 24 pin recommended (to get two 6 amp pins to feed the two video cards via PCI Express slot connectors). For single video card, 20 pin is generally enough. 6600GT for example, draws 4 amps. Xbitlabs.com has measured many cards. If in doubt, do a detailed calculation. 3) 12V output split into two separate 12V circuits. No advantage to customer, due to need to allocate extra "slack" when buying. Perhaps intended to meet IEC60950 ? (To limit max power per 12V output) 12V1 feeds disks and motherboard (and video card) 12V2 used exclusively for processor (in your computer, that would be 8.24A) * 24 pin can plug to 20 pin mobo, as long as pins don't bump 20 pin can plug to 24 pin mobo (same pinout) - use the right holes. Some 24 pin are detachable, into a 20 pin part and a detached 4 pin part. At least one guy has managed to plug the detached 4 pin, into the processor Vcore input. (I haven't checked to see how hard that is to do.) PCI Express slots have 12V pins on them and allow up to 5 amps. Video cards (not overclocked) seem to be designed to draw about 4 amps or a tiny bit more, through the PCI Express x16 slot. The single 12V wire on the 20 pin connector carries at least 6 amps, so using a 20 pin connector on a non-SLI board seems reasonable. The fan header current also flows through the single 12V pin on the 20 pin connector. Main connector rated for 6 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=98716 12V processor power connect pins rated at 8 amps per pin. http://www.molex.com/cgi-bin/bv/mole...roductID=76873 Molex disk drive connector rated at 8 amps per pin (based on assuming a right angle PCB mount connector, and 18 gauge wire - Amp 82181 catalog) Enjoy your new power supply. No need for adapters. The Ultra you have selected, has 12V @ 16A. If you had an 89W AMD processor, that is (89W/12V)/0.90 = 8.24A. A midrange video card like 6600GT is 4A. That is 12.24 amps so far. A disk drive idles at 0.5A. A CDROM can draw 1.5A according to the rating on the label. Allocate 0.5A for some fans. We are now at 14.74 amps of 16A. Your new Ultra is suitable for a midrange gamer with minimal storage devices. More than 16 amps is required if your PC has more toys in it. For example, if you bought an ATI X1900XTX, it draws 10 amps (part through the PCI Express slot, part through the 2x3 PCI Express connector), and you would need about 12V @ 23A to have a stable computer. So, enjoy your new Ultra, but do not overload it. HTH, Paul Thanks for the detailed reply Paul. Just to confirm what you have said: 1. Plug the 20 pin ATX motherboard power cable into the 24pin socket on the MB then... Sorry to be thick Thanks Pete Sorry Paul, I just noticed that the spec on the side of the box is different to the spec on their website. This is what it says on the box, is this better for me or worse? Thanks Pete +3.3VDC=16A +5vDC=30A +12vdc=19A 228W -12vdc=0.6A -5vdc=0.6A +5vsb=2.0A +3.3V AC INPUT 115V/230V 10A/6A 60/50Hz DC OUTPUT +3.3V +5V +12V -12V -5V +5VSB 500W Max Combined Watts 28A 30A 34A 0.8A 0.3A 2A 500W If the link in question is this one, the 34A rating on 12V is plenty. Just plug it in and use it :-) http://www.ultraproducts.com/product...roductID=2 98 HTH, Paul No, the link shows the 500watt psu, mine is the 400watt one but all the specs on the site differ from those on my box, that's why I typed them in. R the specs I listed OK? Thanks Pete |
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