Timetec DDR3-1866L 4GB Replacement for Synology D3NS1866L-4G Non-ECC Unbuffered SODIMM DDR3L 1866Mhz PC3L-14900 1.35V Memory RAM (Compatible for DS620slim, DS218+, DS718+, DS918+, DS418play) at Amazon.com
Amazon.com: A-Tech 4GB Module for QNAP ES1640dc Series NAS Servers - DDR3/DDR3L 1866MHz PC3-14900 Non-ECC SODIMM 1.35V Memory RAM (Replacement for QNAP RAM-4GDR3LA0-SO-1866) : מוצרי חשמל
Amazon.com: A-Tech 4GB Module for QNAP ES1640dc Series NAS Servers - DDR3/DDR3L 1866MHz PC3-14900 Non-ECC SODIMM 1.35V Memory RAM (Replacement for QNAP RAM-4GDR3LA0-SO-1866) : מוצרי חשמל
QNAP RAM-4GDR3LA0-SO-1600 Memory Module for sale online | eBay