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Neither.
I build my systems for maximum speed because I do lots of 3D animation, and I can't say I've ever noticed a difference in anything depending on my RAM choice. The most important thing about RAM is GB, and not all the buzzwords. Those things probably are doing something different, but not enough to notice. You will notice when you run out of RAM though, because you didn't get enough. So fill your motherboard with the max amount it'll take and don't worry about the timings so much.
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