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#1
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power supply replacement
On Thu, 08 Nov 2007 16:49:26 -0800, Robin wrote:
Came home the other nightto find everything quiet, too quiet because I'd left the PC on downloading. Noone noticed anything but it is dead. The PSU doesnt even flash the keyboard LED so I think it's a gonner. My old one was a 600W PSU with a 120mm fan. It ran silently on a mates PC but mine always seemed to have it howling. Was the load on it so high that this caused the noise and premature failure. Most have overload protection. Normally unplugging them for a minute and plugging them back in will start them again. If it starts be sure and make sure the fan(s) are running. If not then check the fans being stuck. This will also cause the PSU not to start. What size do I need..... The bigger the better IMO. Less loads on a PSu mean longer life in general. I buy the biggest rated I can get for under $25 for this machine. Last one was a 680W running Nvidia 6100 with 1 GB ram (2 sticks), 4 power hungry HDTV tuner cards, X2 3800+ cpu, 5 drives and 5 fans. For the other systems I just buy the cheapest I can find 500W or more under $20. The 680W and another 550W are Chiefmax. Been running a year or more without problems. I expect them to last at least 5 years. Or you can go out and pay more for one PSU than all my cases and PSU's together.:-) -- Want the ultimate in free OTA SD/HDTV Recorder? http://mythtv.org My Tivo Experience http://wesnewell.no-ip.com/tivo.htm Tivo HD/S3 compared http://wesnewell.no-ip.com/mythtivo.htm AMD cpu help http://wesnewell.no-ip.com/cpu.php |
#2
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power supply replacement
Came home the other nightto find everything quiet, too quiet because I'd
left the PC on downloading. Noone noticed anything but it is dead. The PSU doesnt even flash the keyboard LED so I think it's a gonner. My old one was a 600W PSU with a 120mm fan. It ran silently on a mates PC but mine always seemed to have it howling. Was the load on it so high that this caused the noise and premature failure. What size do I need for an NF4 mobo, FX55 CPU, Arctic Cooling Freezer64 Pro, 4x 512MB DDR400 simms, ATI HD2900XT, 2 optical dvd drives and three HDDs of various sizes. Sound is onboard so shouldnt effect it loadwise. I did check a Wattage calculator but it said that 480W would do but I think Ati recommend 550W for their vga card alone. What do you recommend? Robin |
#3
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power supply replacement
Thanks to Wes and Paul. Its got me thinking. I am just not sure wether to
buy a named brand at a silly price or a highish wattage generic PSU that should be running well under its rating. Oh decisions decisions. HaHa. Robin |
#4
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power supply replacement
Robin wrote:
Came home the other nightto find everything quiet, too quiet because I'd left the PC on downloading. Noone noticed anything but it is dead. The PSU doesnt even flash the keyboard LED so I think it's a gonner. My old one was a 600W PSU with a 120mm fan. It ran silently on a mates PC but mine always seemed to have it howling. Was the load on it so high that this caused the noise and premature failure. What size do I need for an NF4 mobo, FX55 CPU, Arctic Cooling Freezer64 Pro, 4x 512MB DDR400 simms, ATI HD2900XT, 2 optical dvd drives and three HDDs of various sizes. Sound is onboard so shouldnt effect it loadwise. I did check a Wattage calculator but it said that 480W would do but I think Ati recommend 550W for their vga card alone. What do you recommend? Robin I cannot find a power measurement for HD 2900 XT on Xbitlabs. I thought it was about 165W or so (mainly from +12V), but I could be wrong. This article gives some total system power measurements, and under load, the full computer draws 312 watts. http://techreport.com/articles.x/12458/15 Here they got a total of 363W. They estimate worst case as 215W for the video card ? The manufacturer estimates tend to be on the high side. http://www.extremetech.com/article2/...2128869,00.asp I'm not sure I believe the power measurements in the last article. Xbitlabs measures a 26W difference between a 8800GTX and 8800GTS, while the Extremetech total system power difference is 36W. Ah, maybe some of that is the power supply efficiency (12W more waste heat from PSU) ? They mention "over 160W" here. http://www.xbitlabs.com/articles/vid...-1024mb_5.html OK, I found a measurement of the card here, as 161W. 155.8W on the 12V rail. The only problem with a measurement like this, is they only measure one card, and there will be statistical variation amongst them. http://www.xbitlabs.com/articles/vid...ecture_14.html http://www.xbitlabs.com/images/video...power_full.gif So now I don't know what to use for the video card... ******* FX-55 is 104W. 104W/12V * (1/0.90) = 9.6 amps assuming a 90% efficient Vcore circuit. http://products.amd.com/en-us/Deskto...ail.aspx?id=25 If we took 156w for video, 156W/12V = 13 amps. Add in another 5 amps for storage devices and fans, the total is 28 amps or so. This one offers 12V @ 49A and is $120 USD. Silencer 610 EPS12V Technical Specifications http://www.pcpower.com/products/view...view=techspecs Silverstone SST-ST56ZF ATX12V / EPS12V 560Watts Power Supply 90V ~ 264V (Auto Range) $140 USD +3.3 @ 38A, +5V @ 40A, +12 @ 38A http://www.newegg.com/Product/Produc...82E16817163111 I like the single rail supplies, because they eliminate all the guess work. If I had your system, I'd buy the Silencer if you could find it. The wattage is not too much of an issue, and it is mainly an issue of getting enough amps. If you go with a dual rail supply, then 12V2 10 amps and 12V1 18 amps would be bare minimum. A few amps margin doesn't hurt. It also helps if the supply is high efficiency, at least in terms of the heat that the power supply itself has to dissipate. Supplies with unstated efficiency, will be around 68% efficient, while good supplies are now in the 80% to 85% range. You pay more for the 80%+ designs. This might be as small as I'd go in a dual rail type supply. The 12V rails meet the 12V2 10 amps and 12V1 18 amps numbers. ENERMAX EG495AX-VE FMA ATX12V Ver 2.2 485W Power Supply 100 - 240 V $80 USD +3.3V @ 32A, +5V @ 32A, +12V1 @ 22A, +12V2 @ 22A, , +5VSB@3A http://www.newegg.com/Product/Produc...82E16817194015 Note that the total power rating on 12V for that Enermax, works out to a total of just 32 amps (as shown in the picture in the next link). Your load is 28 amps total, so it just fits nicely. There is no chance you'll make a dent in the 170W combined limit for 3.3 and 5V consumption, and your combined I would estimate at around 80W or less for them. http://images10.newegg.com/NeweggIma...194-015-04.jpg If you wanted both a 2x3 PCI Express connector and a 2x4 PCI Express connector, that might be a bit harder to find. I've seen some supplies with quad PCI Express connectors, that have both 2x3 and 2x4 connectors, but I don't recollect a dual PCI Express power supply with one of each. It would probably take a bit more searching, to find such a combination of connectors. I'm sure that some must exist somewhere. I think your card will function with two 2x3 connected to it, but since you own the card, you know more about it than I do. One of the articles I glanced at, mentioned that the ATI software only allows overclocking, if a 2x4 is detected as being plugged in. Why you'd want to overclock that card, and make it run even hotter and louder, escapes me :-) So maybe a pair of 2x3 connectors is the best option, when selecting the supply. Hope that gives you a few ideas, Paul |
#5
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power supply replacement
On Nov 9, 1:03 am, "Robin" wrote:
Thanks to Wes and Paul. Its got me thinking. I am just not sure wether to buy a named brand at a silly price or a highish wattage generic PSU that should be running well under its rating. Oh decisions decisions. HaHa. More wattage does not mean a more reliable power supply - not even close. But that myth is often heard when on never bothered to first learn the technology. A 600 watt power supply should be grossly more than enough for any computer. Furthermore, many 'discount' supplies (that also tend to fail faster due to missing functions), may actually be only 420 watts. They did not lie. They just provided a different number to a market where knowledge comes only from speculation. Meanwhile, the only useful load numbers are currents for each voltage. Overall power supply wattage numbers says little that is useful. And then the 600 watts may only be 420 watts - just to make speculation even less useful. As demonstrated from wattage numbers, those calculators cannot provide useful information. Only way to learn what has failed is to take measurements from what exists. That means not even disconnecting any wires. These numbers are required to obtain a useful reply. Even swapping power supplies can only provided 'maybe' answers. This two minute procedure is posted in "When your computer dies without warning....." starting 6 Feb 2007 in the newsgroup alt.windows-xp at: http://tinyurl.com/yvf9vh In your case, especially important are numbers from the green, gray, and purple wires both before and when power switch is pressed. No load on a minimally standard power supply will cause a supply failure. That was standard long before PCs existed. In fact, all output wires from a power supply must be shorted together - and still no damage can result. Another standard for power supplies known by those who first learned the technology. Intel specs even list the wire size (or larger) to short out any supply - without damage. A power supply that includes all required functions would cost at least $60 full retail. However, America is full of computer experts who would not even know the load (computer) cannot harm any standard supply. Many supplies missing essential functions are dumped into a market chock full of the technically naive. Nothing in a brand name or that $60 figure says a power supply is even sufficient. But among those products are something far more important - numeric specs. To dump supplies that are missing essential functions, the manufacturer must not claim to include those required functions; must not provide a long list of numeric specs. For example, if a shorted power supply might fail, then provide no specs. When it fails shorted, well, it did not even claim to do what all power supplies did even 35 years ago. Provided is a two minute procedure to get answers. No other post has provided a solution for definitive answers. You need only 'definitive' answers; not speculation. Post those numbers here to obtain additional useful information. Your replies will only be as good as the information you provide. That means numbers. It is only a two minute procedure. |
#6
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power supply replacement
thanks Wes for your suggestion of retrying the PSU. I had previously tried
everything but after stripping it and checking for blown fuses and whatever but there were none. Obvious thought was then to try a different lead in case of blown lead fuse or faulty plug and hey presto it switched on. All is well in the house again. Thanks Robin |
#7
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power supply replacement
"Robin" wrote in message ... thanks Wes for your suggestion of retrying the PSU. I had previously tried everything but after stripping it and checking for blown fuses and whatever but there were none. Obvious thought was then to try a different lead in case of blown lead fuse or faulty plug and hey presto it switched on. All is well in the house again. Thanks Robin While you were ratting around inside the power supply did you think to look at the caps to see if any of them were leaking? I have found a couple of power supplies with leaking caps in the last year or so. |
#8
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power supply replacement
On Sun, 11 Nov 2007 10:52:44 -0800, Robin wrote:
There was plenty of fluff and dust but no sign of leaking caps. At least it's working now. One should clean the insides at least once a year. remove dust buildup from fans and heatsinks. Check fans for freedom of movement. Fan bearings will dry out often with original lubrications. Oiling them (1 small drop) with a lightweight oil, like sewing machine oil, will extend their life considerably. It will also fix any that fail to start because of dried bearings. This is very common and most people just trash them.:-) -- Want the ultimate in free OTA SD/HDTV Recorder? http://mythtv.org My Tivo Experience http://wesnewell.no-ip.com/tivo.htm Tivo HD/S3 compared http://wesnewell.no-ip.com/mythtivo.htm AMD cpu help http://wesnewell.no-ip.com/cpu.php |
#9
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power supply replacement
On Nov 11, 1:52 pm, "Robin" wrote:
There was plenty of fluff and dust but no sign of leaking caps. At least it's working now. A properly constructed power supply needs no dusting every year if operating in a standard room environment. Properly designed supply must work just fine when heavily coated with dust. Fan bearings do not need periodic oiling. Seized fans are more often traceable to manufacturing defects such as the placement of a hall effect sensor inside the fan. The resulting low torque will not be solved by more oil. But many want to cure symptoms rather than first identify the problem. Fans provided in minimally acceptable supplies should never need oiling. Defined in that other post are how to find a reliable supply that includes essential functions. Also noted are why overall wattage numbers say so little that is useful. Some manufacturers forget to include essential functions, sell an inferior supply using only two numbers - wattage and dollars. Actually increase their profit margin on that lower priced supply by 'forgetting' parts. They can do this because so many computer recommendations are without technical knowledge. Long before caps appear to be leaking, the caps are already creating detectable problems. That two minute procedure would have identified the problem long before more system crashes. Most every electronic failure leaves no visual indication. Caps could already be failing and would be detected by that two minute procedure that identifies too many problems to list.. Your current failure, if due to failing caps, will only happen again. Was the problem solved? A defective power supply can still power up a computer. A common myth is a power supply is OK if the computer powers. It could have failing caps, a partially shorted transformer, a failed filter, etc. All those problems also detected by a two minute procedure that is also mentioned in A+ Certified Technician books. You have no reason to believe anything was solved because the problem was not identified. What may have been a safety lockout in the power supply controller (not part of a power supply) may simply happen again. Buy a new power supply and still have the same power supply controller problem? |
#10
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power supply replacement
There was plenty of fluff and dust but no sign of leaking caps. At least
it's working now. Robin |
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