The Geforce2 I have on the other PC is starting to die, same problems. Erratic pixels randomly appearing on the textures, screen flickering on mode change, etc...
And guess what ? It's a card where I had replaced the GPU fan with a dissipator from an old AMD K6, about 2 years ago
So Aspirin, you'd better watch out for yours
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I had this trouble with my ATi 9800 Pro Ultimate card:
My problem was faulty memory which I brought at the same time, to check out your memory use this niffty tool to rule out this problem http://www.memtest86.com/
hehe, for testing memory, linux is also nice ... just boot it up, and if everything's fine, it's very unprobable that you have messy RAM. windows might not notice this explicitly for years, just producing crashs every few days