"This Kingston HyperX blu memory turned out to be a little bit surprising for an entry-level offering. You can easily keep it at the JEDEC standard of 1333 MHz and tighten the timings to 6-7-6-20 @ 1.5v for a very efficient and lower voltage set of memory, or set it by the XMP profile to run at the rated 1600 MHz speed and timings. You could also tighten the timings at its rated speed, to 7-8-7-27, for an even more efficient stock speed setting."

Kingston HyperX blu KHX1600C9D3B1K2/4GX Review @ OCC