in my experience with my xp2100 throughbread, and my mobile barton 2400 (and other people's 2500's)....
if you overclock your 2500 to 3200 speeds in the bios before windows loads, and you have the latest bios update for your motherboard (which can identify a 11x200 setting, or a 3200 setting), then windows will identify the chip as a 3200+
however, having windows "identify" the chip isn't that important...for example, Windows says I have an "unknown CPU type" (my mobile barton), but it says that it runs at 2.41 ghz, which is all that really matters