I have problem when play Tomb Raider:Legend, PC hang up after 15 minutes playing (BIOS 0602, I using Sempron 2800+, 1.6@2.4, Vcore df, RAM Corsair Value 667@800 -setting RAM in BIOS is 533- Vdimm 1.85, vid 7300GT no OC), other game are is OK, Half Life, Call of Duty, Need for Speed Carbon...