So for the last few weeks my PC has been driving me insane, but last night it peaked! Im running 2x680's in Sli. The issue to begin with I thought was driver related, as the screens would go berserk, freeze for a few seconds and then windows would notify me that the drivers had crashed and recovered. Grrrr. Ive tried about 5 different drivers now, each time starting from fresh, but the same problem manifests itself at random times. Over the past week though, instead of freezing, my PC has taken to just literally switching itself off, no warning no BSOD, just black. Then after about 30 secs, it reboots abs fine! On its own. I have removed all over clocks, switched off SLi, checked temps (all really low as all under water), removed individual RAM sticks, left only my SSD boot drive attached, and am beginning to think its my PSU?? But wanted to check if Ive missed anything glaringly obvious first? I don't have a sufficiently large PSU spare to try it, hence this question. Im about to pull the trigger on a Seasonic hobby as Im fed up of failing Silverstone ones! Any ideas, help or rants would be extremely well received! Spec is in Sig!!