G.SKILL Ripjaws 4 series F4-2666C15Q-16GRR 16GB (4 x 4GB) 288-Pin DDR4 SDRAM DDR4 2666 (PC4-21300) 16GB Quad Channel Kit - 4x matched 4GB modules DDR4 2666MHz memory, PC4-21300 With Red Ripjaws 4 heatsinks Timings of 15-15-15-35 at 1.2V Lower voltage means lower power consumption