How can I make sure it’s in 100% perfect working condition. ?
Memtest is what you’re after. You need to boot into it from a USB key because you can’t reliably test ram on a running OS.
There’s a commercial version that has a free offering or this open source one which I’ve found excellent.
I’d encourage you to sell it. In these trying times, any extra supply is helpful.
Fair play to you. It’s definitely helpful to be selling 32GB that would otherwise just be sitting there. Treat yourself to something nice with the money! :)
I recently got a hand-me-down from my bestie of 4x4GB of DDR4 (along with a 3060ti woop woop!) and I’m really happy with it so yeah, folks definitely still want it.
If you have any trouble with memtest feel free to hit me up. I’m happy to help.