4GB DDR3 Laptop RAM PC3-10600S 1333MHz SODIMM Hynix / Nanya – Fully Tested X 2. Speed:PC3-10600S (1333MHz). 1333MHz (PC3-10600). Type:DDR3 SODIMM (Laptop RAM). 2 x 4GB DDR3 SODIMM RAM Module. Model:55Y3717-HY (IBM Equivalent).
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