4GB PC3-12800E 2Rx8 DDR3 1600 ECC UDIMM M391B5273DH0-CK0
Samsung M391B5273DH0-CK0 4GB DDR3-1600/PC3-12800 UDIMM 240-Pin CL11 Dual Rank x8 Unbuffered Memory Module

4GB PC3-12800E 2Rx8 DDR3 1600 ECC UDIMM M391B5273DH0-CK0
Samsung M391B5273DH0-CK0 4GB DDR3-1600/PC3-12800 UDIMM 240-Pin CL11 Dual Rank x8 Unbuffered Memory Module