Nerd on a Budget does one of these Dell Optiplex franken-gaming-PC.
He found an i7-6700 system with 8GB of DDR4 for $88.
LULZ Do you even watch these videos Larry? Your first contention was these would make a right proper Fortnite PC for little Jimmy. Turns out it was the only game that was unplayable.
He rightly points out these are on the wrong side of the bathtub curve/cradle to grave. He has had 2 Sandy/Ivy Optiplex boards die of late. The PSU is so underpowered that a 1650 Super is pushing it. That will lead to faster failure. Bad thermals; these things are the poster children for sunk cost fallacy.
Again, I think it's great keeping these out of the landfill as long as possible. And at what he paid, pulling the 1650 Super and tossing the rest when the day comes, is a good enough deal.
I'd still buy the SFF 2400G for $120, add a LP RX6400 or LP GTX 1650, and game on. It's a couple of years newer, and you can salvage the APU, ram, and GPU if the PSU or board dies. AM4 is now ubiquitous, hence you can transplant and keep using those parts for a tiny ASRock deskmini HTPC all the way up to a ultra budget esports box. At which point you can swap for a faster APU, CPU, and/or vid card down the road.
With the old i7 transplanting is mostly a waste of time. You are still stuck with an old i7.