The G.Skill F4-2666C19D-16GRS is a dual-channel kit of two 8 GB DDR4-2666 memory modules (PC4-21300) from the Ripjaws series. Total capacity is 16 GB. The 260-pin unbuffered-SO-DIMMs support a timing of 19-19-19-43 at 2666 MHz and require 1.2 V power.