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Im hoping someone can help me out with this problem.

Basically when I play games every once in a while i get these video crashes and repeating sound lock ups. At first I thought I had a weak psu, then I thought it might be my ram. but after a new psu annd running memtest it still happens. the other thing it maight be is my gpu but I dont know, Ive checked the temp and its not overheating.know

I have
AMD 3700
Asus A8N sli
2Gb RAM
7800gt
450W PSU

Hello 1200pro,

Welcome to pchf,

Lockups like these are usually caused when the graphics card itself is overheating. The 7800gt has a fan attached. Make sure the slot next to the 7800gt is not used, so that the fan can blow the hot air away, this really does make a difference. You can also use NVidia NTune which records the temperatures of your card:
NVIDIA nTune

Just to note monkey - 1200pro is running an a8n sli (same board as mine) There is a gap of 3 slots (if no 2nd video card is installed) before the first PCI slot

Is this video card overclocked at all?

yeah I use ntune and the temp is good, and there isnt anything in the slot next to my card.

No my card isnt overclocked.

Silly question - have you updated the drivers?

not so silly question - have you overclocked any of the computer? CPU? Memory?

yeah drivers are all up to date, and no nothing is overclocked.

IDK maybe it is overheating. I run ntune to monitor the temp and I have noticed occasional temp spikes, but the time in the logs dont seem to match up.

lately Ive been running Ntune everytime I play just to make sure.

what is the actual temp?