Hmmm... what kind of CPU are you trying to get to 1333MHz? The mod should work for 1066-to-1333MHz jumps ONLY. If you have an 800MHz CPU, then you'll also have to apply the 1066MHz mod.

And it could be that the QuadGT does not like BSEL mods (like the Gigas), or simply that the BIOS is simply not ready/mature yet.

Cheers.

Miguel