Getting faster ram ie pc3200 is usually for overclocking.ie higher fsb lower multiplier.
Using PC2700 with a 333fsb cpu means it is running in sync.higher memory will cause a bottleneck.
Athlon 333fsb + PC2700 ok
Athlon 400fsb + PC3200 ok
You could try running the ram you have at cas2.
If you do go for Corsair memory in this board the best option is to get matched pairs from
Scan or overclockers.co.uk to name but 2