NVidia GF4 ti4200 128mb. I've had the rebooting happen in games before...but I was always able to get the card too respond properly after fooling around with driver or bios settings. It was just that in the new 3d benchmark...I noticed that it was happening in approximately the same area of the test. Now, I was thinking that it is due to heat under load at approx. this length of time into the tests or, as redface has mentioned, it was due to cpu performance (due to it happening in the cpu test 1 & 2). I've read of people having reboot problems...and they each seem to have differnt hardware setups. Some have tried changing psu, ram, etc., and have still been unable to get to the cause. There, doesn't seem to be any specific fixes for this problem. I am ready to try a different cpu to rule out the theory we are discussing in this thread...but I am not sure if the problem is related to this part. I've yet to read a thread... wherein there was some specific reason that this is happening among folks with different hardware setups; and usually under graphic load.