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low GPU usage

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afterjo

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I'm trying to build retro computer, just for fun. But i have problems.

stock dell gx620 with p4 3Ghz. 305W PSU - 12V 18A.

I installed 7900gs GPU, and i can't play games fluently, even if the card is above recommended.

Quake 4 is stuttering and GPU usage is all over the place.

Company of heroes 1, steam versions. This game doesn't stutter, but only use 10% of gpu. CPU is about 60-80% (heavy combat)

What's the problem? If it was PSU, I would see BSOD.
 
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famousbill

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I have this similar issue for a few months now.

When I turned on my gaming PC for the first time in a few months and it's extremely laggy and found the source to be "system interrupts" It uses around 50 - 80% at random times and will go back to normal after a few minutes until I do anything else. I tried this to solve my issue.
 
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