M378B5273DH0-CK0 - Sumsung - Samsung 4GB PC3-12800 DDR3-1600MHz non-ECC Unbuffered CL11 240-Pin DIMM Dual Rank Memory Module M378B5273DH0-CK0 - Sumsung - Samsung 4GB PC3-12800 DDR3-1600MHz non-ECC Unbuffered CL11 240-Pin DIMM Dual Rank Memory Module $104.19 $88.30