Hi. Is there a program or hack to access the EFI (with GUI) like a normal BIOS to change its default settings like core voltage, multiplier and fsb?

Hey alvin777, check this out: http://en.wikipedia.org/wiki/Extensible_Fi...amework_for_EFI
I also believe there is an opensource EFI framework out there, that will work on some machines, but it's main use is with forms of Linux.

Cheers