I have a hard time tossing away good computers. Biggest problem for me is that I am so good at fixing them that I accumulated quite a few that were ones that people were throwing away that I fixed. I try to find them homes vs trashing them. Currently I have 16 computers of which 4 desktops and 2 laptops are used on a regular basis with me using the 2 desktops and 2 laptops and daughter and wife each have their own computers.
For the longest time I had kept the best computer for my own needs and given hand me down lesser powerful computers to them. Then as computers became cheaper to buy there was a flood of Pentium 4 through Core 2 Duo systems being sent my way as the $350 new desktop can run laps around that old Pentium 4 that clients had. Additionally Windows XP being no longer supported scared many into buying new computers and they contacted me asking for a place to get rid of their old computer and I took them off their hands for free disposal of everything except for CRT monitors which i have no need for.
My daughter I was going to upgrade to Windows 7 and a Dual-Core Athlon II 215 2.7Ghz, but she is happy with the old Dell which use to be a Pentium 4 2.4Ghz but I upgraded it to a better CPU with SSE3 that is running a socket 478 single core Celeron D 2.8Ghz, with 1GB RAM, GeForce 6200 256MB AGP video, and 160GB IDE HDD. She plays minecraft, spore, youtube, facebook, and hulu on it for hours and really enjoys XP vs 7. So that old computer has a home in her room with regular use. Looking at the resources when the computer is in use that Celeron D is running full tilt to do what she wants it to, and somehow while that CPU is weak, it does it ok and she has no complaints. When that CPU was for sale years ago it got 5 of 5 rating. The Pentium 4 HT would run better than the Celeron D with extra virtual core of hyperthreading and more cache, but I didnt have one to stuff into her system and one CPU that I thought was correct socket 478 P4 3.0Ghz HT is a mobile processor that looks exactly like desktop CPU, but system wont run it. Kind of stupid that Intel made mobile and desktop CPU's socket 478 and yet they look the same you cant use mobile P4 in a desktop P4.
https://www.newegg.com/Product/Product.aspx?Item=N82E16819112186My wife I had her on a Dual Core Pentium E5400 2.7Ghz which was fine and she was happy with until she used my quadcore the one day and was saying she wanted faster because she felt the speed difference between my quadcore and her dualcore. So I got a Core 2 Quad Q6600 2.4Ghz for $15 off ebay and she is now happy with the Quadcore system upgrade.
The 10 other systems I have range from first generation Pentium 4 1.7Ghz with 768MB PC-133 SDRAM all the way to two 8-core systems that I built for use only when needing to number crunch or play games that the Athlon II x4 620 2.6Ghz with 4GB RAM struggles with like Witcher 3. Of the 10 computers I have 6 desktops and 4 laptops with the weakest laptop a Intel Atom 1.66Ghz with 2GB RAM, a few Core 2 Duo Laptops and Dual Core Athlon Laptop from 2009 that the GPU is too weak in to play modern games that looks like new because only used on business trips.
Finding homes for older computers that are 7 to 15 years old is kind of difficult because people can buy new computers these days so cheaply and people dont like lag even if computer is free they would rather pay say $200 or $300 and not have lag. Additionally people feel the push to be away from XP because they feel insecure about XP no longer having updates although they miss XP when they get Windows 8 or 10 and complain about this and that.
I have been tempted to space save by disassembling 4 of the large towers and storing the parts as good guts. Place the motherboards with CPU and RAM left installed into large ESD baggies and place into storage to safe for some day when there might be a demand for them as well as I do run some legacy games and the first Generation Pentium 4 1.7Ghz with 768MB RAM works best with older games from the mid 90s designed for Windows 95 and single-core CPU execution.
I have software going back to the 1980s. Most of it mid-1990s and newer. Binders full of software CD's and sharpie marker on the binder where the CD is with the key that was on the jewel case. Tossed out about 1000 jewel cases to save space. Years ago I got rid of my floppy disks around 1999 when i got a CD Burner and was able to fit 2 trash bags full of 360k 720k and 1.2MB floppy disks onto a single 650MB CD-R. I very rarely ever access that CD and made a newer copy of it since Disc media ages. but its nice to have all those shareware games and other software and DOS Freeware all taking up the space of a single CD-R.
I have a large and heavy HP XW9400 Server that I need to get rid of, but havent done that yet. It has 16GB of ECC RAM but it is a dual- dual-core ( 4 cores with 2 x dual cores ) with two AMD Opteron CPU's, and processing power wise its just too weak to be used for any needs I have. It has two FX-4600 Quadro It draws 365 watts of power when running. The fans in it are noisy and I was going to sell it but some of the capacitors are swollen on the large server motherboard. It runs correctly, but the capacitors are part of that capacitor plague that broke out some time ago due to the stolen electrolyte recipe that was sabotaged. That server is in my attic and its been eyed a few times as it really should go, but I'd rather have it go to someone who could use it vs a landfill. The nVidia FX4600 Quadro cards I was hoping would be good for video games, but they draw lots of power and are not designed for games. I even checked to see if BOINC would support the FX4600 cards for GPU number crunching processing since the cards were designed for CAD and Engineering Simulation/Design use I figured maybe they would be weak for games but shine when it comes to processing power for number crunching for BOINC Asteroids project that I donate computer processing to. But these cards are not supported for GPU processing. I see high price tags on these Quadro cards but they just dont sell often. I might hold onto the video cards as a maybe some day there will be a collector demand for them since they dont take up much space.
If I was looking to get rid of computers and computer hardware for free, I'd probably use Craigslist or FreeCycle.
I have used freecycle to get stuff for free like a good working treadmill, mountain bike for my wife, and a good working Sony 27" Color TV CRT type for play with my old NES where the gun controller requires a CRT to work properly.
https://www.freecycle.org/ Freecycle can be used to get rid of stuff too. I havent used it yet to get rid of anything but its free to use.