Memory modules on Synology's and QNAP's official compatibility lists. Sorted by how many NAS models each is listed for.

PartNAS modelsBuy
QNAP RAM-4GDR3L-SO-160054Amazon eBay
QNAP RAM-2GDR3L-SO-160041Amazon
QNAP RAM-8GDR4D0-SO-320030Search Amazon
QNAP RAM-8GDR4T0-SO-266630Amazon eBay
QNAP RAM-8GDR3-SO-160029Amazon eBay
QNAP RAM-4GDR4A0-UD-240026Search Amazon eBay
QNAP RAM-8GDR4A0-UD-240026Amazon eBay
Synology D4ES03-16G26Amazon eBay
QNAP RAM-4GDR4A1-UD-240025Amazon eBay
QNAP RAM-8GDR3L-SO-160024Amazon eBay
QNAP RAM-32GDR4ECT0-UD-320023Search Amazon eBay
QNAP RAM-16GDR4A1-UD-240022Amazon eBay
QNAP RAM-1GDR3-SO-133321Amazon
QNAP RAM-2GDR3T0-SO-160021Search Amazon
QNAP RAM-4GDR3-SO-160021Amazon eBay
QNAP RAM-4GDR4T1-SO-266621Search Amazon eBay
QNAP RAM-16GDR4T0-SO-266620Amazon eBay
QNAP RAM-8GDR4K0-SO-320020Amazon eBay
Synology D4ES03-8G20Amazon eBay
QNAP RAM-4GDR4K1-SO-240019Amazon eBay
QNAP RAM-8GDR4A1-UD-240019Amazon eBay
QNAP RAM-32GDR4K0-SO-320017Amazon eBay
QNAP RAM-4GDR3T0-SO-160017Amazon
QNAP RAM-4GDR4T0-SO-266617Amazon eBay
QNAP RAM-8GDR4K1-SO-240017Amazon eBay
Synology D4ECSO-2666-16G17Amazon eBay
QNAP RAM-16GDR4G0-SO-320016Search Amazon
QNAP RAM-4GDR4D0-SO-320016Search Amazon
QNAP RAM-4GDR4ECP0-UD-266616Search Amazon eBay
Synology D4EC-2666-16G16Amazon eBay
QNAP RAM-16GDR4A0-UD-240015Amazon eBay
QNAP RAM-2GDR4A0-SO-240015Amazon
QNAP RAM-2GDR3LA0-SO-186614Amazon
QNAP RAM-32GDR4ECK1-UD-320014Amazon eBay
QNAP RAM-32GDR4ECS0-UD-266614Amazon eBay
QNAP RAM-4GDR3LA0-SO-186614Amazon eBay
Synology D4ES04-4G14Amazon eBay
QNAP RAM-4GDR3LA0-SO-160013Amazon eBay
QNAP RAM-8GDR4ECT0-UD-266613Search Amazon eBay
QNAP RAM-16GDR4K1-UD-320012Amazon eBay
QNAP RAM-2GDR4P0-SO-240012Amazon
QNAP RAM-32GDR4ECK2-UD-320012Search Amazon
Synology D4EC-2666-8G12Amazon eBay
QNAP RAM-4GDR4A0-SO-266611Amazon eBay
QNAP RAM-16GDR4ECT0-UD-266610Amazon eBay
QNAP RAM-16GDR4ECT0-UD-320010Amazon eBay
QNAP RAM-1GDR3L-SO-160010Amazon
QNAP RAM-16GDR4ECP0-UD-26669Search Amazon eBay
QNAP RAM-16GDR4K2-UD-32009Search Amazon
QNAP RAM-32GDR4K0-RD-32009Search Amazon eBay
Synology D4ER02-32G9Amazon eBay
Synology D4NS01-4G9Amazon eBay
QNAP RAM-16GDR4ECG0-UD-32008Search Amazon
QNAP RAM-32GDR4ECD1-UD-32008Search Amazon
QNAP RAM-32GDR4ECT0-RD-32008Search Amazon eBay
QNAP RAM-32GDR4K1-SO-32008Search Amazon
QNAP RAM-8GDR4K0-UD-32008Search Amazon eBay
QNAP RAM-8GDR4K1-UD-32008Search Amazon
Synology D4ER01-16G8Amazon eBay
Synology D4ES01-16G8Amazon eBay
Synology D4ES02-8G8Amazon eBay
Synology D4RD-2666-32G8Amazon eBay
QNAP RAM-16GDR4ECT0-RD-32007Amazon eBay
QNAP RAM-16GDR5K0-UD-56007Search Amazon
QNAP RAM-32GDR5D0-UD-48007Search Amazon
QNAP RAM-8GDR4D1-UD-32007Search Amazon
QNAP RAM-8GDR4ECP0-UD-26667Amazon eBay
QNAP RAM-8GDR5K0-SO-56007Search Amazon
QNAP RAM-16GDR4ECN0-RD-32006Search Amazon
QNAP RAM-16GDR4ECT0-SO-26666Amazon eBay
QNAP RAM-16GDR4K0-SO-21336Amazon
QNAP RAM-16GDR5ECK0-UD-56006Search Amazon
QNAP RAM-32GDR4ECP0-SO-26666Amazon eBay
QNAP RAM-32GDR5ECK0-UD-56006Search Amazon
QNAP RAM-48GDR5ECG0-UD-56006Search Amazon
QNAP RAM-4GDR4K0-SO-21336Amazon eBay
QNAP RAM-64GDR4ECK0-RD-32006Amazon eBay
QNAP RAM-8GDR4ECN0-RD-32006Search Amazon
QNAP RAM-8GDR4ECT0-SO-26666Amazon eBay
QNAP RAM-8GDR4K0-SO-21336Amazon eBay
Synology D4EU02-8G6Amazon eBay
QNAP RAM-16GDR4D1-SO-32005Search Amazon eBay
QNAP RAM-16GDR4ECK0-SO-32005Amazon eBay
QNAP RAM-16GDR4N0-SO-32005Search Amazon
QNAP RAM-32GDR4ECD2-UD-32005Search Amazon
QNAP RAM-32GDR4ECK0-UD-32005Search Amazon eBay
QNAP RAM-32GDR5ECT0-UD-48005Search Amazon
QNAP RAM-32GDR5K0-UD-56005Amazon
QNAP RAM-48GDR5ECP0-UD-56005Search Amazon
QNAP RAM-4GDR4A0-UD-32005Search Amazon
QNAP RAM-8GDR4ECK0-SO-32005Amazon eBay
QNAP RAM-8GDR4ECT0-RD-32005Search Amazon eBay
QNAP RAM-8GDR4K0-RD-32005Search Amazon
QNAP RAM-8GDR4K0-SO-26665Amazon eBay
Synology D4ES01-8G5Amazon eBay
Synology D4ES02-4G5Amazon eBay
Synology D4EU02-16G5Amazon eBay
Synology D4RD-2666-16G5Amazon eBay
QNAP RAM-16GDR4ECK3-UD-32004Search Amazon
QNAP RAM-16GDR4K0-RD-32004Search Amazon
QNAP RAM-16GDR4K0-SO-32004Amazon eBay
QNAP RAM-16GDR4K1-SO-26664Search Amazon eBay
QNAP RAM-16GDR5ECT0-UD-48004Amazon eBay
QNAP RAM-2GDR4P0-UD-24004Amazon eBay
QNAP RAM-2GDR4T0-SO-24004Amazon eBay
QNAP RAM-32GDR4D1-SO-32004Search Amazon
QNAP RAM-32GDR4K1-RD-32004Search Amazon
QNAP RAM-32GDR4T0-UD-32004Amazon eBay
QNAP RAM-32GDR5N0-UD-48004Amazon
QNAP RAM-32GDR5T0-UD-48004Amazon eBay
QNAP RAM-48GDR5G0-UD-56004Amazon eBay
Synology D4ER02-64G4Search Amazon
Synology D4ES01-4G4Amazon eBay
QNAP RAM-128GDR4ECS0-RD-32003Search Amazon
QNAP RAM-16GDR4D2-UD-32003Search Amazon
QNAP RAM-16GDR4ECK0-RD-26663Amazon eBay
QNAP RAM-16GDR4ECT0-RD-26663Search Amazon eBay
QNAP RAM-16GDR5D0-UD-56003Search Amazon
QNAP RAM-16GDR5K1-UD-56003Search Amazon
QNAP RAM-16GDR5T0-UD-48003Search Amazon
QNAP RAM-32GDR4ECD0-UD-32003Search Amazon
QNAP RAM-32GDR4ECK0-RD-26663Amazon eBay
QNAP RAM-8GDR4ECT0-RD-26663Search Amazon eBay
Synology D4ER02-16G3Amazon eBay
Synology D4EU01-16G3Amazon eBay
Synology D4EU01-4G3Amazon eBay
Synology D4NE-2666-4G3Amazon eBay
QNAP RAM-16GDR3EC-RD-16002Amazon eBay
QNAP RAM-16GDR3ECT0-RD-13332Search Amazon
QNAP RAM-16GDR4D0-UD-32002Search Amazon
QNAP RAM-16GDR4ECT0-RD-24002Amazon eBay
QNAP RAM-2GDR3LK0-SO-16002Amazon
QNAP RAM-32GDR4ECK0-SO-32002Search Amazon
QNAP RAM-32GDR4ECK1-RD-32002Search Amazon eBay
QNAP RAM-32GDR4ECT0-RD-21332Amazon eBay
QNAP RAM-32GDR4S0-UD-32002Search Amazon eBay
QNAP RAM-4GDR4A0-SO-32002Amazon
QNAP RAM-4GDR4D0-UD-32002Search Amazon
QNAP RAM-8GDR4-RD-24002Amazon
QNAP RAM-8GDR4A0-SO-32002Amazon eBay
QNAP RAM-8GDR4ECI0-UD-32002Amazon eBay
QNAP RAM-8GDR4ECT0-RD-24002Amazon eBay
QNAP RAM-8GDR4N0-UD-32002Search Amazon
QNAP RAM-16GDR4T0-UD-32001Search Amazon eBay
QNAP RAM-16GDR5T0-SO-56001Amazon
QNAP RAM-32GDR4K0-UD-32001Amazon eBay
QNAP RAM-4GDR4P0-RD-32001Search Amazon
QNAP RAM-8GDR4ECD0-UD-32001Search Amazon
QNAP RAM-8GDR4ECK0-UD-32001Search Amazon eBay
QNAP RAM-8GDR4ECT0-UD-32001Search Amazon eBay
QNAP RAM-8GDR4T0-UD-32001Search Amazon eBay
Synology D4ER01-64G1Amazon eBay
Synology D4ER03-32G1Search Amazon