ddr3 memory question

Solution
That is the best RAM for your build.

Performance would be maximized

Depending on what the system is used for, if it can take advantage of high frequency/bandwidth, DDR3-1600 -> DDR3-2400 can be a significant performance increase.

Dunlop0078

Titan
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I don't think it is worth the money in any way to upgrade RAM just for faster speeds.

To answer your question. Possibly a by a few percent in some games, my old haswell system seemed to perform the same no matter my memory speeds though I did not thoroughly test it with a bunch of games. Even if you did see a few pecent in FPS gains it would still be an utter waste of money.