It all depends on what you do (and how you do it), for strictly gaming and email a little browsing, etc then no you won't really see much difference if going to say 2133 (maybe 1-3 FPS in the gaming, however if you really USE the computer, multi-task, video. imaging, VMs, CAD, large number of open windows and use memory centric apps or large data sets, then yes, faster DRAM is well worth it, and Haswell does like faster DRAM more so than previous gens like IB and SB....you also see gains if using the CPUs on board GPU rather than a discrete GPU - especially with AMDs APUs