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Timetec Hynix IC 4GB for Synology NAS DiskStation DS218+ DS718+ DS918+ DS418play DDR3/ DDR3L 1866Mhz PC3L-14900 1.35V Non-ECC Unbuffered 204 Pin SODIMM Memory RAM(Equivalent to Synology D3NS1866L-4G) - Walmart.com
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CMS 16GB (2X8GB) DDR3 14900 1866MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Synology® DiskStation DS918+ - A5 at Amazon.com
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