Computer Restarts Randomly when I do anything that actually matters...
Hegelian:
If the rest of the PC is fairly old (more than 12-18 months) you may have some difficulty finding a PSU that has the proper connector for your motherboard. For some years the standard was a 20-pin connector, but now all the new motherboards and PSUs come with a 24-pin connector (in addition the 4-pin connector that powers the CPU). So you may need to shop around to find a suitable unit (I'm in the same position myself, actually).
As someone mentioned, it isn't just watts; the amps are important also. I've read recently that you need an absolute minimum of 17 amps on the +3.3v rail, and realistically you should be looking for a minimum of 25~30 amps on the +3.3v line and 30~40 amps on the +5v and +12v lines (excuse me if my EE terminology isn't correct).
Also, try to get something with an efficiency rating of at least 70% at 100% load, and with voltage regulation no worse than 5% on the +3.3v, +5v, and +12v rails, and no worse than 10% on -5v and -12v—3% and 5% would be preferable. In essence, you're looking for something like this or better:
Efficiency: 74%
Output:
+5V @ 32A
+12V @ 26A
-12V @ 0.8A
+3.3V @ 28A
+5VSB @ 2A
continuous = 470W / peak = 520W
Regulation: 5% (+3.3, +5, +12) / 10% (-12)
Ripple: 1% (p-p)
Hold Time: 16ms
PG Delay: 300ms
Silencer 470 ATX
Companies that have been putting out good-quality units recently include, Cooler Master, Silverstone, and PC Power & Cooling. The Antec units are popular but have disappointing specs and some users report premature failure, so I would look elsewhere. You can compare specifications and user experiences at Newegg.com.
NOTE: If this is a Dell PC, there is a good possibility you won't be able to use an off-the-shelf replacement power supply, because Dell motherboards often have non-standard pin-outs on the motherboard connector. PC Power & Cooling offers PSUs specifically for Dell PCs.
bekka:
Thanks Hegelian, I used your specs when shopping and think I got one that won't make things worse at least. Not cheap, not expensive and has the ability to use either 20 or 24 pin connector. So all I have to do now is get over my fear of simple tools and put it in. Not a Dell thankfully but I've never look closely at my case and PS so that's the next step I suppose. :P
B:
Quote from: bekka on 2007 August 24, 00:26:15
So all I have to do now is get over my fear of simple tools and put it in. Not a Dell thankfully but I've never look closely at my case and PS so that's the next step I suppose. :P
The only tool you need is a Phillips head screwdriver. Before unplugging the old supply, it might be wise to take a picture or two of the connections so you can always revert to the current setup if you get confused. Other than that, it's just a plug and play scavenger hunt.
KatEnigma:
One piece of practical advice- as you're taking out the last screw, make sure to support the PSU so that it doesn't go crashing onto your cards. :D
witch:
You could probably find a pictorial tutorial on the net, I found one for someone once who wanted to change their video card.
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