Im afraid all the above info is incorrect.
The M/B you have is a SLOT A, the highest chip manufactured in Slot A format, was the 950Mhz. I myself haven't seen any over 850Mhz, as by the time the Slot A 800Mhz was released, the Socket A processors arrived and started to take over.
Intel Core2Duo 6400 @ 3.4Ghz
4GB Geil 6400 Ultra
3 x 500 Gb Samsung HD
EVGA 8800 Ultra OC