I have a problem with this mobo. System locks up continuously, especially when running something that uses a lot of memory. However, freezing can happen even if system is idle, but rarely. I tried memory tests (Orthos, Everest, SiSoft Sandra, etc) and every test freezes my system after 40s to 3 mins. I thought that this is memory issue, but then I tried 4 different RAM models (Transcend JetRam 800MHz, Kingston ValueRam 667MHz, Kingston HyperX 800MHz, Corsair ValueRam 667MHz and Corsair XMS2 800MHz), and results are all the same, system locks up after a few minutes of memory testing. Bios settings are set to fail safe defaults. I tested all my components on the other motherboard and everything works perfectly. What may be the problem? Thanx