Higher DRAM freqs can add some FPS, it's not a major rise in FPS but 1600 to 2400 could be 10-15 maybe, depending on game, it is of primary help in other things like multi-tasking, video, imaging, VMs, and other memory centric tasks, and with prices what they are it's sort of ridiculous to 'settle' for 1600 when 1866 and even 2133 are often the same basic price