I got it clocked up to 1600. Wasn't that big a deal. Drop the q6600 multiplier to 8 jack the FSB to 400 up a little voltage and it's running the 12800 fine.
Any body with the P5KC have trouble with the black Sata ports? I checked in bios and all the sata ports are enabled to IDE, even installed the raid driver on the second go around with windows and nothing I plug into the black ports is reading.
Might have to RMA the board.