Just build a x2 4400+ (2.3) system for my mat with a 6800gt graphics card and 2gb ddr2 memory. I havent installed the dual core patches cos xp seems to be working fine. anyway he's played flatout 2 and f1 2002 so far, but within about a hour they crash. he's run prime95 for about a hr, and no cores failed, so that leave my thinking its the graphics card is over heating. What do you think guys? nothing is overclocked.