G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM 1333MHz PC3-10600 Dual Channel Kit Desktop Memory Model F3-10600CL8D-4GBHK 4GB (2 x 2GB) DDR3 1333 (PC3 10600) 240-Pin DDR3 SDRAM CAS 8-8-8-21; 1.5V Unbuffered Dual Channel Kit