I would think you could hit 1ghz with FSB adjustment only. I am running 120FSB with my 850 and no GFD, and I am runnin' 1025. You may or may not be able to hit that high of a FSB, but you won't need to to hit 1ghz. I wouldn't be surprised it you hit 1.1 without a GFD... I am being held back now by my generic PC-100, but I can't complain as it is doing CAS2, 4-way, and Turbo at 120 now. I can't wait till my two sticks of Mushkin Mosel come in...