Dell OptiPlex 3090 Tower Desktop PC (Intel i3-10105 4-Core, Intel UHD 630, 4GB RAM, 1TB HDD,DVD-RW, Ethernet LAN (RJ-45), Ubuntu Linux 20.04) - Walmart.com
Amazon.com: Orange Pi 800 Six-Core 64 Bit 4GB RAM Dual Band WiFi Bluetooth 5.0 All-in-One Keyboard Computer Kit with 64GB EMMC, Run Android, OS,Manjaro,Ubuntu,Debian (Pi800+TypeC 5V4A Supply+HDMI Cable) : Electronics
hardware - Physical installed RAM is 6GB, but 4GB only is used by Ubuntu 22.04 as well as by Windows 7 - Ask Ubuntu
Is 4GB of RAM sufficient to run Linux Gnome smoothly? - Quora
Amazon.com: ATOPNUC Ubuntu Linux Mini PC,Intel Celeron N4020 Linux Computer 4GB RAM 128GB eMMC,Fanless Micro Desktop Computer Suppport HDMI&VGA,2.4/5G WiFi,BT5.0,Gigabit Ethernet for Business, Home : Electronics