DDR 2 MEMORY currently works at faster clocks than DDR1, but it still has some latency hang-ups. 800MHz DDR 2 may work at CL4 ms, but faster implementations of DDR1 can work at CL 2ms latencies, at 400MHz. This is a trade-off that you simply have to accept. This lands AMD a problem. By moving to DDR 2 800 with an Athlon AM2 CPU, you won't see a pants-busting performance boost. Stuff will run faster, but up to roughly five percent faster not much more than that.