to be honest, it probably won't matter much as long as you buy one of the "good" brands - DFI, Asus, Abit, and MSI all have plenty of boards that can OC pretty high. Since the X2 3800+ is generally limited to under 2.6GHz (mine is stuck at 2.47), all you need is a mobo capable of 260-275MHz speeds, which is pretty common. Just pick a board that can do that reliably and that has the features you want. Hitting a 325MHz FSB overclock is great, but it's kind of pointless if your CPU tops out around 650MHz below that.