It doesn't really matter for what the board is rated for, it's the CPU that requires a certain clockspeed from the memory.
Sure it's possible to run asynchronous ram speed with some of the new motherboards - but tests show that asynch memory can in fact drop overall performance. AMD systems usually work best with sync memory.
Your CPU is rated for PC3200 actually so the ram could be a slight problem. But in any case it shouldn't be a showstopper by means of having lightyears better performance after simple speed bump.