Kingston Predator 16GB (2x8GB) 1866 MHz DDR3 RAM/Memory Kit Review (KHX18C9T2K2/16X) - Benchmarks - PCMark7
PCMark7 is a "real-world" benchmark which runs an array of real-world tasks, such as multiple-tab web browsing, file copying, reading, and writing, gaming, and a large variety of other tasks which are meant to give your system a rating as it pertains to actual usage, and not engineered synthetic benchmarks. This benchmark will give us a good idea of the actual difference we're likely to see at these different settings. One thing to keep in mind is PCMark is highly CPU-based, and memory speed is directly related to processor speed, so take these results with a grain of salt.
A very small performance increase is shown in the PCMark results chart. This is not unexpected, because in the standard user environemnt, which consists of opening files (mostly HDD-related), gaming, editing documents, and while memory speeds help along the processor, intensive tasks for the average user like gaming is very GPU-intensive and doesn't put alot of stress on the CPU. Of course, as previously mentioned, if calculation intensive programs are being run, like stitching together pictures or rendering images, the small boost in clock speed can have an impact in the minutes for long operations.