Wasn't the KT266 just a DDR upgrade for the KT133A? That's what I thought. It is a whole new chipset that has a lot in common with the KT266A. It has added ATA133 support, USB 2.0, and as you have already covered, DDR333 support. It looks like a winner to me. I might Have to pick one up with my GeForce 4 Ti in early March.