All I can say is when I was still playing on the PC, I got a substantial bump with the faster memory. Always did. Perhaps if one isn't properly configuring timings they may not fair too well. But as I stated earlier, if the system properly supports it higher performance memory can make a difference---especially if the memory subsystem is one of the bottlenecking factors. Simply dropping 2133mhz cards in a laptop may not benefit if it is still only going to run as 1600--but with PC'S that allow you to reconfigure timings it can be a whole different ball game. The simple act of being able to run a faster bus speed can ramp things up to a new level across the board.

In other words, dropping memory in a system capable of running at higher clock rates/tighter timings may not appear to improve things if you are still running it at the same bus speed and CAS/RAS. But if the system properly supports it and is configured to run it properly, it can improve things considerably.