My q6600 G0 L737A won't really go past benchable fsb 480 on this and perhaps 435 stable but with my cooling I would prefer to stay at 400. With better cooling, chipset and cpu, I am quite certain higher stable clocks would be there. I had to get a bios from msi techs to use lower multis with my quad. Was really frustrating the first week I had this board to be locked at 9.