Well, like tMQ said, they advertise the fact that the BH7 will run at 800 mhz fsb. If I were you though, I would wait a while. Try and pick up a later revision of the P4C chip which would hopefully o/c better...plus you know hardware sites are going to try this setup. Abit claiming that their board is capable of this is a lofty goal and I'm sure that many will want to test this.
Just my $.02.