Well I've kept on trying things, I've manually deleted the directx files and reinstalled, I've lowered the graphics card frequencies again and it still crashes when entering the game, with Hitman Absolution and Battlefield 3 which are the two I'm using to check, in COD Black Ops II single player mode with everything maxed out it takes a while but it crashes too.
I've run the BurnInTest from FurMark again at MSAA8x 1680x1050 and with PostFX, I left it for 10 minutes and temperatures were normal and no crashes, I've run the Heaven Benchmark 4.0 several times and in several ways in Directx11 in Extreme and it never crashes.
This is a real headache, the screen goes black and the sound loops, there's no way, it seems like it's an instability error due to overclocking or something like that but it's impossible I don't have anything like that set up and the bios is more than checked…. please help...