Hi Sylvia,
The DX79SI with latest BIOS 0559 fails WHCK for Windows 8, not in the least due to lack of Secure Boot.
As per the above page, Intel ran the test with BIOS 1777 and it passed the logo/WHQL/WHCK test.
I am wondering when that BIOS, which enables the DX79SI to pass WHQL/WHCK testing, will be released.