Nick, I thought the same thing until I read in another forum that someone had successfully run a Celeron 566 in a BM6 board with the HL bios. I didn't think it was feasible either, and I wonder if anyone else can confirm they have done the same. Of coarse, the chip was not identified in the bios of this other machine as a Celeron, but as a P2 of some sort. I have yet to read anywhere on these forums that someone has tried a Celeron 566 in a BM6 with the HL bios and met with failure. It would be nice to keep that voltage range...