This ones pretty strange. After installing either win7 x86 or x64 + drivers and then attempting to run Kombuster vga stress tester, it will fail to run [installs fine] and return an error 'D3DCompiler_42.dll is missing....'
The same cpu, ram and vga card [Gigabyte GTX680] etc. on Intel's near identical DX79SR board using the same vga driver does not have this problem.