Greetings. My hardware consists of the following: AMD P2 x4 955 BE ASUS M5A99X EVO MSI GeForce GTX-560Ti (2) 1Tb Seagate Baracuda 7200.12 1Tb WD Caviar Black Corsair TX-850V2 Now lets start a log. From the start I got the cpu, its stayed at 3.7Ghz with 1.4v overclock. In between I had the north bridge at 2600mhz last year, but it was causing blue-screens, because of which I turned it off, and ultimately the culprit was the faulty hard drive. Now nearly a month ago, my pc froze randomly after usage. This was when I had my northbridge at 2600mhz exactly 1 day prior to the hanging. And then finally when I was installing nvidia 314.22 there was a bsod just after it told me to restart. Unfortunately it just restarted n I couldn't see the code. After that I dropped the ball and dialed it back to 2000mhz north bridge. Running stable, no problems. Now around 1 week back, I dialed back to 1.35v, and 3.2Ghz because of the weather. SLI was still there. Just yesterday, I sent a card in RMA(TwinFrozr II Fans so OP), so now I'm stuck with 1 card. I just get these random freezes/hang ups again. No BSOD. It just hangs. Only 1ce I got an error of 'nvidia driver 326.19 stopped working' (updated recently), and the other 1 time I recovered from the freeze, my usb keyboard just got messed up. I had to disconnect it for some time and then plug it back in. Any idea whats causing these issues? My bets are slightly on my 850W PSU, but then Corsair psu's dont break often, and it has fairly served me right till now. Plus both gpus running at 99% load for hours it sustained. Hell it even rode through crysis 3. Just cant figure out whats exactly wrong. Also, I hard disk smart stats check out. 0 errors there. GPU also sorta checks out. Only culprits possible are motherboard,cpu,ram,psu. Any suggestions or help will be appreciated.