I've had installed a new motherboard, Gigabyte 7N 400 L v2.0, and when I bench the CPU/memory, I'm getting results exactly 34% less than I should.
My system specs are XP SP2, Athlon XP 3200+, 1x512MB PC3200.
As the performance deficit is 34%, it leads me to believe that my RAM is only running as if it's PC2100, or something's throttling it.
I've manually set the frequencies for my memory(as opposed to letting my BIOS auto detect), and checked that the bus settings are correct for the CPU and memory and they're showing as 200/400 respectively. I've also disabled temperature throttling in case it's heat related.