I run both my KT3 Ultra 2's at 166x12 for 2.00 Ghz with XP1700+ "B" Thoroughbred CPU's. They have been very stable reliable boards. As for your overclocking potential, it depends more on your CPU and cooling solutions than the motherboard. The KT3 Ultra 2 can handle it, as long as you don't go too far over 166 on the fsb, since it only has the 1/5 PCI bus divider and the 2/5 divider for the AGP bus. I have been content to run mine at 166 with PC-2700 ram.