Some games just shutdown and shows black screen, it's pretty much random. System is on stock 45nm Intel CPU so it's plenty of power and on 4670 i have added Revoltec 9.2cm that cools down pretty much all heat problems. Let say if i do Heaven in OpenGL or in DX10 it will shows that black screen somewhere in the middle, or 3DMark Vantage in Performance, but it runs at entry level and 3Dmark06 it's also OK. So do i need to run it as medium that will pretty much fix the problem but GPU on 4670 is fast to do on high? Do i need to do higher volts on GPU over BIOS or something?