I've had this problem for quite a while now and I have tested more than 10 different drivers but all give me the same problem. I ran OCCT for 6 hours without a crash and temps where 70degree on GPU and 55 on CPU. I saw something weird though while runing memtest again. The First stick was running at 6-6-6-20 647MHz 1295MHz and second one was running at 9-9-9-24 647MHz 1295MHz, They are supposed to be running at 8-8-8-24 1600MHz @ 1.5V so I changede their links to the correct one but No errors were found I ran them 20 passes on each stick. I believe both are running at 8-8-8-24 2T now but is that correct?
I've tested a AMD card in my system (removed nvidia drivers before ofcourse) but I got same error with the AMD card which I Know works as my its my friends. I dont think its the GPU that is faulty and nor I believe its a driver related problem as these errors happens when I did a fresh install of Windows 7.