shuts off suddenly

Gateway / Gm5084
April 18, 2010 at 20:56:59
Specs: Windows XP
My pc is shutting off with no warning. I bought a used video card to play a popular game. The card needed a bigger power supply. Since putting in the new power supply (400 watt) I was unable to install patches for that game. During the installation of the patch the pc would suddenly shut off. After reinstalling my old power supply I was able to install the everything I needed for the game. I reinstalled the new power supply and the pc started shutting off suddenly after 15 minutes or so. I replaced the new power supply with another new one (same power) and the pc still shuts off but now varies in the length of time it will stay on. normally 2-3 hours but sometimes longer or shorter. It will shut off whether it is being used or not. Never have a prob turning it back on. Have left the cover off the pc and had a stand up fan blowing into the case to keep the pc cool but it still shuts down so I believe it is not a heat issue. I have done all updates for the pc (drivers/windows/spyware/virus) have done multiple virus/spyware etc scans including reg mechanic. I do not have a problem with the pc with the old power supply in it but am unable to run the video card to its full capabilities with the smaller supply. I don't believe the card is the prob because it runs fine with the old power supply other than not being able to use the better graphic settings on it.

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April 18, 2010 at 21:31:14
You may need to look into the power supply's detailed specs. You old power supply might have used only one 12 volt pair of rails with a single amp rating, but the new power supply probably has two 12 volt rails each with it's own amp rating. If combined, the numbers add up to more amperage than the one you had before, but it is not used that way on your computer. Before, you might have had say 20 amps available that all circuits could draw from (numbers for example only, not accurate) and your graphics might have taken most of it. If now you have two 15 amp circuits, some circuits will be very happy with all they need, but the one that has the graphics card on it ONLY has 15 amps to share, graphics card, and all. You probably actually getting LESS available amps for graphics with the larger power supply.

In short, look for a power supply with a single 12 volt rail around the 400 to 450 watt range, or go with a 500+ wattage with enough amps on each rail to cover your video card on one side (look for 12 volt amp specs on your old power supply).

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