all earlier boards top out around that speed. The new ones should be good well over 333 (1333) FSB.
I haven't yet tried flashing to the latest BIOS, but Kentsfield FSB overclocking on this board appears to be absolutely horrible, I had an ES Bad Axe 2 in my system before, and besides the spacing of the PCIe slots, and the non-functionality of my sound card (oh yeah and no SLI support...) it was a MUCH better overclocking board.
I can't even get much over 300FSB on this board with a Kentsfield, and from what I've seen around the net, that's about par for the course... I'm very disappointed.