My main desktop is temporarily a Dell server from around 2012 or so. Two were thrown out, each with two 2 GiB sticks of RAM, so I poached the other machine's RAM for a grand total of 8 GiB. I also threw in a small SSD for the / partition (/home is on the old HDD). The thing is dirt slow but I never notice, even YouTube video playback works fine. Even on hardware well over a decade old, Debian runs fine.