Download SiSoft Sandra
here - it's a good benchmark program but like all, is not flawless.
In your BIOS, set 4-Way interleaving on, Turbo mode on (if your RAM will handle these timings) and set the cycle length to 2. My generic PC100 CAS2 runs PC133 2-2-2 4-Way interleave + Turbo mode for two 128 sticks. Hope that answers your question. Feel free to PM me if you have any other questions I'm on here everyday.