Overheating issue

[Shuk]

Hey guys, I've run into a problem where whenever I play games, about 10 to 20 minutes in the monitor goes into power save and the computer crashes (but doesn't turn off). I've been able to correct this problem by underclocking both my graphics card and cpu and by blasting the graphics card fan to 100% and removing the side panel of the computer.

Here's the thing: I've tried keeping the graphics card settings normal, and underclocking the cpu, the problem still happens. I've also tried the opposite, leaving the cpu settings default and underclocking the graphics card at 100% fan. Anything less than both and the problem happens.

I'm going nuts as to how to solve this without buying a new graphics card or CPU!

 

[knothead34]

if your having to underclock your cpu and graphics......then there is a serious problem. you sure your cpu fan is running? what case do you have? how many fans? if its crashing even at stock settings .......what is your power supply?

 

[Shuk]

I got a 500W Ultra power supply, and it's worked fine for a while. I have a 30 dollar heatsink attached to it (I think it's Masscool). I have an Ultra mid-tower case with a round hole in the side because I took off the "Ultra" logo, so I think that's fine. Do you think it's the power supply or the cooling?