Done quite a few tests and i'm pretty sure it's a driver issue. The Hitman benchmark with 1 card hits an average of 65% GPU load with a high of 73%. In-game it actually fares much better 99-100% GPU usage. In terms of the freezing, I'm testing both cards individually, and I've used GPU stress tests and had no issues even with dual cards. The weird thing is the random freezing happens on the desktop, when idle, ie viewing webpages.
Still working my butt off to see what the root cause it
I'll try a few others games, single card, and dual card, but surely if the card had faults it wouldn't run the games properly or an intensive GPU stress test.