At first I thought my overheating problem was with my 6800GT, so I bought and installed a NV Silencer and that keeps the GPU temp at a max of 70c, which is real nice. The problem is, I still overheat while playing certain games.

When I overheat, my speakers make a loud buzzing sound and I see a kind of checkerboard pattern on my monitor. I don't know where to start looking, any suggestions?

Specs:
BFG Geforce 6800GT
AMD Athlon 64 3200+ socket 939 CPU
Soltek SL-K8TPRO-939 mobo
XP Home SP2
1 gig PQI Turbo PC-3200 DDR RAM
Western Digital HDD
Antec 420w power supply

Check your CPU temperatures, that might be it too.

Do you use the stock cpu heatsink/fan?

what do you mean "you still overheat"??

you have solved your GPU heat issue, yet you say you are still overheating :confused: generally speaking, the mobo would shut the system down if you were "overheating"

Check your CPU temperatures, that might be it too.

Do you use the stock cpu heatsink/fan?
No, I use a Thermaltake Silent Boost.

what do you mean "you still overheat"??

you have solved your GPU heat issue, yet you say you are still overheating :confused: generally speaking, the mobo would shut the system down if you were "overheating"
The system doesn't shut down, it just goes to a really strange, almost checkerboard screen. The checkerboard has the colors of what was usually on the screen at the time, just really small and a bunch of them. It's a really strange problem. =\

I read a while ago about this problem (sorry cant remember where) and it turned out to be a chipset problem....you could do a google and see what comes up?