A-Tech 4GB RAM for Lenovo IdeaCentre AIO 3 27IMB05 All-in-One (1 x 4GB) DDR4 2933 MHz PC4-23400 Non-ECC Unbuffered SODIMM 260-Pin Laptop Notebook PC Memory Upgrade Stick Module at Amazon.com
4GB Stick for IBM-Lenovo ThinkCentre M Series M78 Small Form Factor M78 Tower M93p Small Form Factor M93p Tower. DIMM DDR3 Non-ECC PC3-12800 1600MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
KINGSTON 4GB (1 x 4GB) RAM DDR4 PC4-2400 Laptop Memory Stick for Dell Asus Acer | eBay