I bought a couple of days ago GeCube 4870 and started to play those games. I tried it at 1600X1050 with all graphics in full and after a while it crashed the pc causing my computer to restart! After that i enabled Vsync which allowed me to play a little longer but still after 20 - 30 minutes the pc restarts!! after the restart the ATI's temperature is at 80 C which is the temperature that the card has when it is idle!! Does anyone have similar problems?? i'm using vista 64 Core 2 DUO E8400 4Gb RAM in a P5K asus mobo and have tried catalyst 8.5 , 8.6 and now i have installed 8.7 beta and the problem remains the same!! Have to say also that assasin's creed works perfectly with all the graphics options in full!! Also most of the times after such a restart the computer restarts on its own when it enters vista for a couple of times more till it stabilizes!!!