Might be RAM sticks, as they didn't seem to work well in any sockets. I used to have 4x4gb and now I'm down to 2x4gb with the ones which seem to work the best.
I've usually sold all my old PCs to people who don't need gaming PCs. I'm getting few euros and they're getting a functional PC for emails and such.
Win-win
Sounds like a good arrangement. I'm actually pretty impressed at how well computer have held up for the past ten years or so, performance-wise. Once SSDs came along it felt like you didn't really need a lot of power to get work done in a hurry.
Except for Macs, of course. Their cheap plastic seems to disintegrate the minute their warranties expire, and then they just force obsolescence on their operating systems to add insult to injury.
SSDs are awesome. They helped to give an extra push to old PCs to be comfortable to use. Same with my wife's laptop, it's getting really old but as I had changed the HDD to an SSD, it's been a pleasure to use for longer once again.