My athlon xp2000+ (palomino), 133MHz FSB&mem seem to get strangely low speed rates, around 130K/sec. This is in contrast to my other xp1800+ (t-bred) overclocked to 1640 MHz (slightly lower than xp2000+) and 194MHz memory which gets about 190K/sec, and my old athlon 750Mhz at about 80K/sec.

I'm puzzled as to why the xp2000+ would only get about 60% higher rates than the athlon 750. In GIMPS, the xp2000+ is roughly 3 times faster than the 750.

Is there perhaps a problem with the cpu recognition? I can imagine disabling SSE and/or whatnot support would be Bad for speed.

Are there any benchmark numbers around?

Do any of you have similar systems? What speeds do you get?