Hello, Not sure if I've made a mistake here. But, I have a 2400 Athlon XP and bought an Abit NF7-s mobo to get AGP 8x and Dual channel memory. So basically it's was supposed to run at 2x133mhz FSB. I then bought some crucial PC4000 memory ( thinking of the future). Will this memory run happily at this much slower speed ? I tried it but kept getting error messages when loading win2k.