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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
DDR4 RAM】 Gigastone Desktop RAM 16GB (2x8GB) DDR4 16GB DDR4-2666MHz PC4-21300 CL19 1.2V 288 Pin Unbuffered Non ECC UDIMM for PC Computer Desktop Memory Module (Desktop ONLY) at Amazon.com