I have a Gigabyte 8IK1100 canterwood and it does support 400 fsb chips. - however, the memory options are only 2.0x and 2.66x with the 400 fsb chip. And worse, no matter what you set it at it doesn't seem to run the memory async at 400 fsb. I got a 2.4B and my memory scores jumped through the roof even with the memory running at (the baord said) 333 both ways. With a 533 fsb processor you get 2.0x, 2.5x and 2.66x as memory options.