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    NVMe cards are SSDs. Are you comparing them to SATA SSDs? Commented Oct 26, 2021 at 14:55
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    PCIE 2.0 x1 is 500 MB/sec which is the likely bandwidth that will be offered using an adapter card. So it would actually be slower than a SATA III SSD if that is true.
    – Ramhound
    Commented Oct 26, 2021 at 14:57
  • @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. Commented Oct 26, 2021 at 15:16
  • @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. Commented Oct 26, 2021 at 15:18
  • Your unlikely going to be able to boot to any drive connected to a NVMe PCIe adapter card. If you want to boot off a SSD you should get a SATA SSD. If your machine has BIOS firmware instead of UEFI then it will NOT work.
    – Ramhound
    Commented Oct 26, 2021 at 15:22