SKILL Trident X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM 2666 (PC3 21300) Desktop Memory Model F3-2666C12D-16GTXD 16GB DDR3 Dual Channel kit, 2x 8GB modules 2666MHz PC3-21300 specification Timings of CL12 (12-13-13-35) 1.65V TridentX Series from G.Skill Includes TridentX heatsinks with removable top fins