Mine does 450x8 at ~1,45v in bios. 500x7 at 1.5v and 400x9 only takes 1.4375v

I would assume the amount of voltage needed to run a clock from what I have seen has to do with the FSB speed as well. Because they are all 3.5-3.6ghz clocks. Just takes a variety of voltages, generally with my G0 what it boots at for bios voltage up to 3.8ghz takes about .25-.5 more voltage for stable.

If X38 doesnt turn out to be a quadmontser, then I will most likely upgrade from deluxe to premium and see how well it does then.