G.Skill F3-12800CL9D-4GBNQ 4GB (2 x 2GB) 240-Pin DDR3 SDRAM 9-9-9-24 1600 (PC3 12800) Dual Channel Kit Desktop Memory,G.SKILL,F3-12800CL9D-4GBNQ" /> A desktop memory kit, suited for upgrading system RAM Has a 1600 MHz clock speed, which is considerably more favorable than some similarly priced kits This kit has 4 GB of total memory You will need 2 open DIMM 240-pin slots to use this memory Be sure not to mix modules of different speeds if you already have memory installed.