basically there's 3 setups that use the 266 bus. the kt133a chipset, the amd 760, and the ali magik. over at monarch, they're selling the asus which has the kt133a which does support the 266 fsb t-birds, and uses pc133 sdram. if you look at benchmarks, the ddr boards (amd 760 and ali magik) do perform better, but require ddr ram. so in my opinion, it all depends on how much you're willing to spend.