Recently upgraded from GTX570 SLI to GTX970 SLI and a 34" 3440x1440 LG screen - which is nice. Spec as per sig. However, I've been plagued by crashes since the upgrade - so, what I've done so far --> - Made sure everything is powered, connected and seated correctly - Changed the power cable connectors - PSU has 4 x 6+2 pin - Returned the system to non-overclocked - Used MSI Afterburner to return the two (factory overclocked) cards to standard nvidia specs - Swapped the cards around - Swapped the SLI connector - Wiped the previous drivers, and installed latest - and after this didn't work .... - Complete re-install of Windows Issue manifests as - Random freeze crashes after between 20mins or up to 3hrs system on time. No identifiable trigger. When the screen comes back out of power saving mode, or screen saver, there are graphics errors - little flecks all over the screen. The flecks can be resolved by changing the resolution, and then back again - but I lose perfect graphics, every supposedly sharp line is misaligned - difficult to describe, but it's not "right". Interestingly, most games play OK - but WOWP crashes the system completely. Additionally interestingly, when I run either of just one card - WOWP black screens, but the system doesn't crash completely. All that said, the system still crashes over time - so it's not just a WOWP issue. I'm currently running just one card to see if I can emulate the crash, and if not, will swap to the other and try that one - my suspicion is that there's some some of memory error on one of the cards - but I'm not sure how to test for that. Any pearls of wisdom chaps?