Have a p4b 2.67, if you're not familiar with the 'b' it means it's a 133mhz bus (533mhz fsb) chip, not the usual 200/800 you see with the more popular 'c' chip. I have a gb of pc2700 ram, but my motherboard doesn't support dual-channel. Also, my cpu absolutely refuses to overclock, not even to 2.8 mhz. I'm trying to decide between a 9800pro and a 6800nu.