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OWC 8GB PC3-12800 DDR3L 1600MHz SO-DIMM 204 Pin CL11 Memory Module Upgrade Compatible with iMac, Mac Mini, and MacBook Pro (OWC1600DDR3S8GB) at Amazon .com
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Kingston Technology ValueRAM 8GB DDR3 1600MHz PC3 12800 ECC CL11 DIMM with TS Server Workstation Memory KVR16E11/8 at Amazon.com
Kingston Technology Value RAM 8GB 1600MHz DDR3 ECC CL11 DIMM SR x 4 with TS Intel Desktop Memory KVR16R11S4/8I at Amazon.com