Well, i don't know, but (as far as i know) the motherboard (Abit BE6-II) is one of the best for overclocking.
I suppose it would go up to 900, 950 (if you are lucky), but it depends on the CPU of yours.
The mobo can support the following FSB speeds (in MHZ):
66, 73, 83-200 (increments of 1MHz!). This can all be set up in the BIOS (SoftMenuIII).
When using a mobo with SoftmenuIII (i think every new Abit mobo has SoftMenuIII) you can push your CPU to the limits.
Something