You should try to get your system stable at CL2, and it doesn´t really matter if it´s 2-3-3-6 or whatever, the CAS latency will make most difference.
On the other hand you´ll be able to overclock the FSB much higher if you ease up on the timings, and that´ll give you even faster performance.
I´m running my RAM at CL 2.5 cause that allowed me to raise the FSB about 20MHz more.
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