I don't think the DDR is going to result in enough improvement to justify buying it if you already have SDRAM you can use. I run a 1ghzDuron with 256mbSDRAM on my K7S5A O/C to 1.1ghz 110 CPU/146.6SDRAM, default voltage and it runs great. As to the talk about 100/100 outperforming 100/133, all I can say is @ my current settings it beats the crap out of 100/100 benchies when I bench both of them changing only the FSB.