PC2100 overclocks from default 133 FSB to 140s or low 150s FSB only on average (100% insync).
MHz speed = [FSB] x multiplier
3200+ is 2200 MHz = [200] x 11
Since there's no way you can hit 200 FSB with PC2100 RAM, your BIOS will not display 3200+ but if the multiplier isn't locked on it, you may increase the multiplier x lower FSB.
With PC2100 RAM, I'd get $62 Thoroughbred B 2100+ at newegg.com, then buy a copper heatsink like Thermalright (pricewatch.com) then maybe get a Thermaltake Smart Fan 2 to adjust the fan noise level to choose noise to performance as I like, then overclock slowly to rach
low 150s FSB x maybe 15 multiplier for close to 2.3 GHz overclock with increased Vdimm voltage to the max and increased Vcore voltage to 1.8 or 1.85 volts.
This is because getting a gig of PC3200 RAM would be very, very expensive.
What 1700+ do you have right now because if it's a Thoroughbred B, you may only need to invest in better cooling and power suply brand.