Amazon.com: QNAP TS-451+-2G-US 4-Bay Next Gen Personal Cloud NAS, Intel 2.0GHz Quad-Core CPU with Media Transcoding : Electronics
QNAP NAS Memory Upgrade Guide - Quick tutorial on increasing your RAM
2GB Memory for QNAP TS-451, TS-451+, TS-451U DDR3L PC3L-12800 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
How To: Upgrade QNAP TS-451+ NAS To 16GB RAM – andy.ph
Success! Adding 2 x 8GB RAM to my TS-451+. TrueNAS is running way better with the additional RAM. 8GB was enough just for basic file sharing but it did run into issues
QNAP TS-451+ with 8GB DDR3L RAM for Sale in Miami, FL - OfferUp