 "Corsair XMS3 - DDR3 4 GB: 2 x GB DIMM 240-pin" " Corsair 240-pin TW3X4G1333C9A System Memory (RAM) CDW.com
"The XMS3 family is Corsair's mainstream line of performance DDR3 memory. These modules allow users to experience outstanding memory performance and stability." 
 "Corsair 4GB 2X2GB DDR3 1333MHz CL9 Dual Channel Memory Kit" Kit - CMV4GX3M2A1333C9 NCIX"
 Quick Specs: Compatibility Desktop Error Checking Non-ECC Number of Modules 2 x 2 GB Number of Pins 240-pin Signal Processing Unbuffered Form Factor DIMM Memory Speed 1333 MHz Memory Size 4 GB Memory Technology DDR3 SDRAM Memory Standard DDR3-1333/PC3-10600 ProductId 1015767274