There's more benefit to running the 2 in sync, rather than trying to raise the clocks on both as much as possible. Think efficiency, not just pure horsepower.The new Core 2 duo and the A64/X2 perform well with 4:5 memory divider, it allows you to run the ram faster then the frontside bus.
Sometimes this is true, sometimes it is not true. It depends on (1) the MB design and (2) how much faster than a 1:1 ratio the RAM is run. You need to do real-world testing to find out what is the case in your situation.Running the RAM at a higher frequency than the CPU's front side bus may seem like a good idea because of the higher ram bandwidth, but that benefit is offset by the cycles that are wasted from not having that 1:1 ratio.