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Whats the deal with 24pin ATX PSU connectors
In article , "Pete"
wrote: 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 Is it out of date?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 OK. You copied two chunks of text. You show this one, which looks like it might be copied from the label: +3.3VDC=16A +5vDC=30A +12vdc=19A 228W -12vdc=0.6A -5vdc=0.6A +5vsb=2.0A and then you show a second chunk of stuff, which looks like it is a copy/paste from the web page for a _500W_ power supply. Notice how the "500W" text string occurs twice he 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 So while it looks to me like two power supply specifications, I guess you're telling me to ignore the second, longer chunk of text, and pay attention to the first chunk ? In my original reply to you, the last paragraph in the reply, attempted to show you that I need to know the hardware in the box to work out the power. I still do not know what video card you are using. I picked as an example card, since I don't know your video card, the 6600GT, and demonstrated how to total up a few current consumption numbers. My example calculation showed 14.74 amps of load on the +12V. Since you are telling me the label on the side of the supply shows 12V @ 19A , that is enough for the _sample_ hardware configuration I made up. Either provide a complete hardware inventory of your computer, so I can work out the _real_ number, or continue to not supply the information, and work it out for yourself. My guess right now is, you have enough power, at least until you tell me about the X1900XTX you just plugged in. Paul |
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