I have the same MB and processor and I am using pc 100 ram. First of all you can change the ratio for that MB so you can use pc 66, pc 100, or pc 133, with any fsb processor speed. With that said I was lucky enough to have pc 100 ram that is capble of running way over 133 at cas 3. My p iii 733 is presently overclocked to 966, on the 133:100:33 ratio setting. By the way if you have not done the math that means my pc 100 is running at 175mhz. I have just generic Micron ram so you never know just give it a shot before you buy anything. Besides you can use it on the 100mhz setting it will just be a little slower