You'll quite likely get 733 (from 5.5x100+500 to 5.5x133+733). You may get this stable at default voltage of 1.65, but you probably have to up it to 1.70 for rock solidness. If you got decent cooling, this is a good oc.
but you might be able to go higher, oc'ing your pci and agp busses. 750 is very achievable, given good cooling. you may get 800, but htis will requyire more cooling, and your pci and/or agp cards may not like the overlclocked busses, causing system instability (if u go too far, you'll cause damage to your cards and/or motherboard).
but 733, like i said, is a good oc, with everything except your cpu running at spec.