the memory divider is on 1:1 automatically. Depending on your mobo you could set it manually to 1:1 as well, which would be putting your memory, if you have ddr 800, on 400. I don't think theres any real pros about having your memory run faster then your cpu, or is there ? If your memory has a divider making it run slower then your cpu's fsb, then you're simply losing memory bandwith, but often a higher FSB offsets ram running a little slower in terms of processing power.
But, most ddr 800, even value ram, will overclock a little, but your e6600 that has a 9 multie, you could get to 3.6ghz without overclocking your ram the slightest bit.