I have problem with my pc. Random reboots with post "hyper transport sync flood" error. It happens completely random. Most times i watch movie, some times when i play a game, even when i browse internet. My spec are as follow: MB ASUS M4A78-E CPU Phenom II 940 Sapphire Radeon hd4850 Vapor-X RAM OCZ DDR2 PC2-8500 kit 2x2GB PSU CM Real Power M520W CASE CM Centurion 590 Temps of MB, CPU and 4850 are in normal range. MB is hooter, around 60-70°C under load, Radeon 60-65°C under load (playing game for couple hours). CPU dos not past 50-55°C. So i think its not a cooling problem, CM case is pretty good, and have a lots of fans. I try with this memmory: TWIN2X4096-6400C5DHX same problem.