Hi. Having a bit of a headscracher here. This is by far not the first computer build i've done, tho the first on this platform. First, the setup: ASUS P9X79 Intel® Core i7-3930K Corsair Vengeance DDR3 (CMZ16GX3M4X1600C9) Sapphire Radeon HD 6950 2GB GDDR5 Corsair SSD Force Series 3 Seagate Barracuda® Green 2TB Corsair TX850M At first everything was fine, then the following day there was a warning of fans failing, tho they clearly was not. A few hours later returning from screensaver the computer did not respond. The screen frozen with screensaver active. A quick restart and it worked fine. Stresstested it - passed with flying collors. Memtested it - Pass. Problem returned later on same night. Reinstalled - Didn't help. Stripped the system from everyting non essential using one by one DDR module - problem persists. This worsend and have now started to eat DDRmodules. I'm thinking flawed MB. Any thoughts? /Rab.