Running at 2.8Ghz now. My memory is definitely a problem, I think it's actually only PC2700 and not 3200 like I thought! I've had to put the voltage up to 3v to have it running at 186Mhz. Will have to drop that to 140Mhz until I can afford some better RAM. I shall have to see whether the increased cpu speed is a worthy trade off for faster RAM. Not sure whether to sod it it and keep the RAM at 3v until it's time to buy new stuff. CPU is stock volts.
SuperPi has just done 34.08 on 1M.
3Ghz I had to up the CPU core to 1.5v (1.52 actual), but it suddenly dropped and the system hung. I might have another play. I'm sure I could get there.