@Ramhound Here's another better link: hardware-corner.net/desktop-models/Dell-OptiPlex-7020-MT It should be #20 at the key towards the bottom. So I can't replace the Power Supply at all?

@Ramhound Thanks! So an nvme card is compatible with an unsupported motherboard (optiplex) via PCIE 2.0? I have a buddy who tried to use it as a boot drive and his optiplex motherboard didn't recognize it. I'm just trying to use it as an additional drive though.

@user1686 Yes, with Sata SSDs. There are different devices though. NVME is not compatible with BIOS boot on older motherboards. So my question is if it is even possible to use it with an unsupported BIOS at all, not as a boot drive but as an extra drive.