Asus Prime X370-Pro - Any reason why it doesn’t POST with the only GPU in the chipset PCIe x1 slot?

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I had been trying to boot this motherboard with a Matrox G550 PCIe plugged in directly inside one of the PCI x1 Slot, but was not successful.

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Contacting ASUS did not help much, except they pointed me to a hardware compatibility list document(here).
In that document on page 11, Section 3.3.2 ‘Other GraphicCards’, they list two PCIe x1 GPUs

  • HIS H545H1GD1
  • KINGFUNG KF210-512MB-DDRI
    However it is not obvious if they tested it by placing it in the x1 slot or the x16 slot.

I did note this thread https://forum.level1techs.com/t/153101, which talks about certain power issues (but I am not sure if they are talking about the riser or the slot in the mobo)

Any information appreciated :slight_smile:

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The x1 slots are shared with other onboard stuff. So make sure there isn’t a conflict of some sort.
Did you confirm that the card is actually working?

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Can this be somehow a UEFI/Legacy BIOS issue?

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I have the same motherboard working fine with a PCIe x1 Zotac GT 710 in a x1 slot as the only display card in the machine.

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Does this work in the graphics card cpu slots? If you boot with a different graphics card, does the card show up as a device?

I couldn’t get many older pcie cards to even detect in Ryzen, at least not without a bridge chip in a mining riser to sort of help things along. My Intel z370 was even worse in this respect. Never used a g550 though.

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