I have a system waiting for a AMD Athlon 2500+ that is supposed to be here thursday (2/19/04). In that system, I have only pc2100 memory. The FSB of the 2500+ is 333mhz, and I might want to raise that to 400mhz to make it a 3200+. I will be upgrading that memory when I get the money. Could I get by with pc2100 memory without underclocking or anything like that?