I put my hand-me-down P3-700 on my BH6 and it runs fine. You can always set the FSB thru "User Define" in the BIOS. Only problem is that I can't get it to OC. I was running it at 132 FSB:Q (924 MHz ) for months without a hitch on my BE6-II, but on the BH6, all I can get is Turbo. When I got to the first mark over nominal (112Hz), it has a cow and can't see the HDs. I wonder if it's the Quantum drive I have in that box. I've got Maxtors in the Def PC.