Steam game itself uses 800 MB of memory, but total when running is 4GB RAM + 2GB swap? - Ask Ubuntu
4GB RAM but only 3.2GB Usable - CPUs, Motherboards, and Memory - Linus Tech Tips
4GB RAM INSTALLED BUT (Usable 932 MB Usable } - Microsoft Community
What happened to my 4GB of RAM? - OEMPCWorld
Indoor AIO digital signage, 43 INCH, SERIES MB, with RK3288 processor, 4K ready, 4GB Ram, 16GB ROM, FullHD, all in one android, screen for bar & restaurants(menuboard) - DS-43MB-RK