What's the Difference Between 1866 and 1867MHz Speed Memory?
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TPFEEL 8GB 1866/1867MHz PC3L-14900S RAM DDR3 204Pin SO-DIMM Memory Upgrade Kit For Late 2015 iMac 27" Retina 5K Models and PCs - AliExpress
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16GB OWC 1867MHz DDR3 SO-DIMM PC3-14900 2x 8GB Memory Upgrade Kit
