It's a pity around 20 games wasn't used for the test, games like Crysis 3, Hitman Absolution, Sleeping Dogs, Civilisation 5, Skyrim, Alan Wake, Saints Row 5 etc etc, not sure it's fully conclusive.
I've got a few sticks of ram including the ones you used, once I've got my haswell rig setup, I'll run a few tests at 1600@9-9-9-24 and 2400@10-12-12-31
Interesting, a few years ago I did a similar test with an AMD rig using Crysis Benchmark over 5 runs per bench, taking the average.
Graphics Card: GTX 295
CPU: AMD Phenom II X4 955 Black Edition @ 3.6GHz (3.8Ghz = add extra 2 fps)
Ram: OCZ Blade Series 6GB (3x2GB) DDR3 PC3-16000 Triple Channel (Tested at various timings using 2x2GB) / OCZ Platinum 4GB (2x2GB) DDR3 PC3-10666C7 1333MHz Dual Channel (SAME RESULTS)
Crysis 1600mhz 7-7-7-24 = 54.98 fps
Crysis 1333mhz 7-7-7-24 = 54.43 fps
Crysis 1333mhz 6-6-6-24 = 54.87 fps
Crysis 1333mhz 9-9-9-24 = 52.98 fps