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#21
The RAMmon report you ran says you now have PC 6400 running at 1.8 volts
Get more of that.
Therefore: the first of the two on your list: DDR2 PC2-6400: CL=6
I am taking your word for it that the RAMmon test is accurate and that you have properly used the Crucial configurator.
Your ram will run at the speed of the slowest ram, so get at least the speed at what you have. Any faster won't matter unless you plan on changing the slower out again later. A Guy