So far 2.616 ghz stable with Prime and Super Pi. Board is very quirky. It is much like a DFI in that respect. I had updated the bios to 1.08 and then it would hang at the Aopen screenie. I did a few things and finally changed the Vid Card to the top slot from the bottom slot and all is well.
There definitely is a limitation on this board as far as fsb. BUT we should all realize that these chips started on a different factor of 166 versus 200 so right there is a huge difference. So really 220 is 250 in that regard.
I figure with a little prodding this thing will do 2.7 with a tweak here and a tweak there. After working with it for a while it is quite a stable board and well worth it. I need to do some more stress testing today but it should be good to go and in the case soon (I always run a test bed out of the box first to get things tidy. THEN put it in the case and route the cables, etc.
By the way, one piece of advice: Always, ALWAYS reset the C-MOS when changing CPUs and/or memory.