Recommended Tests

I recently decided overclock my e6600 and I was able to put it to 350FSB with 9x multiplier quite easily. I probably would have been able to push it farther but I was wondering if my ddr2-667 ram, clocked at 700MHz, would bottleneck it since its real clock speed is 350MHz and I can't seem to push it farther than that. Would I see an improvement if I put my cpu fsb at say 400 even though my ram was at 350? I plan on upgrading my ram eventually, but probably not for 6 months or so; I'm hoping the advent of ddr3 can make prices for high-end (500fsb+) ddr2 drop.

I am also wondering about what "read" and "writes" such as seen in process explorer really are. Are they read and writes to the cpu cache, the ram, the hard drive or any of the above? And how is the limit affected by fsb?