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Proper Power Supply for Comp?

Old 04-17-06, 11:37 AM
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Proper Power Supply for Comp?

Is there some sort of equation to figure out what the proper power supply for a PC is?

My power supply has been making noise (well, the fan in the supply) so I figured I would get a new one.. Fry's has 350W FAR, so i picked that up.. but when i got it home, i realized my current comp has a 425W.

My comp has 2 HDs, 1 DVD-R, 1 video card and a tiny bit of neon on the front. Will 350W run all this ok?
Old 04-17-06, 11:42 AM
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Nope. You need to get proper one. I have experienced using different power and it didn't work at all.
Old 04-17-06, 11:52 AM
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I guess that's my question what is a proper sized one? The comp I'm using I built from scratch, so the only reason I have a 425W is that what the case came with
Old 04-17-06, 11:53 AM
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It could be fine but it depends on the brand.

I had a ps rated at 300 or 350 watts (I forget which) running 5 hard drives, 3 optical devices and a tape drive (only the hard drives and probably 1 optical drive ran at the same time). In addition it was handling an overclocked CPU, a decent video card and at least 3 fans. But it was an Antec which is conservatively rated.

I have a Dell with no more than a 300 watt ps (it's probably 250) that runs 3 hard drives and 1 optical drive. The video is on the motherboard on that one.

So I'd give it a try. If you have any problems suspect the ps first.
Old 04-17-06, 11:55 AM
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From my understanding that some certain motherboards requires certain amount of power. Many new motherboards required 425W to make it work...
Old 04-17-06, 11:58 AM
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we recently had a thread here that linked a page where you could input the devices running off the PS and it would provide the recommended wattage. of course, i cannot find the link now. does anyone remember?
Old 04-17-06, 12:07 PM
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previous thread: http://forums.dvdtalk.com/showthread...t=power+supply

power supply calculator: http://www.jscustompcs.com/power_supply/
Old 04-17-06, 01:17 PM
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thanks, ZakVTA.
Old 04-17-06, 05:42 PM
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This is a ver good ballpark

but you still need to figure out if your wattage output and wattage consumption are on the correct rails.

For example, if you have a 350 watt power supply, but it only allows 12 amps on the 12 volt rail and your processor + video card are demanging 20 amps on the 12 volt rail, it won't work properly and the power supply is too weak even though the total watts appear to be enough.

Play it safe and buy a quality power supply. If you have a high end video card, be even more cautious that your 12v rail has enough juice all by itself (you can find that out at the vid card manufactuers web site and by looking on the sticker on the side of the power supply).
Old 04-17-06, 09:20 PM
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Buy a quality name brand power supply. It'll probably have enough voltage on the 12v and other rails.

The generic "wattage" is often

1- exaggerated
2 - doesn't tell you much about its actual performance or quality


I run my socket 754 A64 2800+, 1GB RAM, Radeon x800, 2 HDDs, 2 optical drives, 2 lights, and a bunch of fans...and a few usb devices...on my 350w Antec.

But then again, it has 21v on the 12v rail.
Old 04-17-06, 10:16 PM
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Originally Posted by GreenMonkey
But then again, it has 21v on the 12v rail.
Looks like it might be a little out of spec.
Old 04-18-06, 04:23 AM
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Originally Posted by X
Looks like it might be a little out of spec.
Oops

meant 21A on the 12v

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