They utilize 240-pin PC3-10600 DDR3 DIMM sockets. You can often max them out at 4GB.
The and ET1851 are legacy budget desktop PCs from the early 2010s, originally produced by Acer’s low-cost sister brand, eMachines . While nearly identical in their simple black tower chassis, they served as entry-level "gateway" systems for home users during the Windows 7 era. Quick Technical Overview ET1850_ET1851
These machines were designed for light everyday tasks—web browsing, document editing, and basic media consumption. They utilize 240-pin PC3-10600 DDR3 DIMM sockets
Features include an integrated memory card reader and a DVD-RW drive. Upgrade Potential and Modern Use ET1850_ET1851