wow dude, that are horrible timings for PC3200 RAM.... 2.5-4-4-8!?! Ouch, the 4-4 is what is the really crappy part. The 2.5 and 8 (cas latency and cycle time) effect stability more than bandwidth...if you wanted to overclock you'd want to loosen those two numbers and after you got so far you'd then want to raise the middle numbers, but jesus, they are already loose as all ungodly hell. You'd be better off selling those and getting these:
THOSE will OC...the ones you have, I highly doubt will want to go very far at all. BTW When OC'ing you will need more than stock voltage dude, they can probably take 2.8-2.9 without any problems at all, RAM can generally take more voltage than people think, but sometimes valueRAM won't like to be OC'd or messed with at all.
Try changing your multipliers on the ram to loosen the timings. I don't think you need to drop the CAS speed then.
Try the ram multipliers at 5:6
There are no multipliers that effect their timings. The kind of ratio you are talking about would just make the CPU and RAM not perform at a 1:1 ratio, which is what he would want for optimum overall system performance.