The game benchmarks all show small performance improvements if faster and quicker memory is used. However, DDR3-1600 does not provide the extra bang you would expect. In fact, DDR3-1333 and other settings with low latency settings prove to be the best for games.
PCMark Vantage Results
The PCMark Vantage memory test results are close to what we found with the synthetic benchmarks, and the overall result reflects everyday performance: there is very little difference between the fastest and the slowest memory configuration.