Mi100 not detected in Gigabyte server

I 4x AMD Instinct Mi100 GPUs and a Gigabyte G292-z20 server and the cards are not recognized. The PCIe slots show up as empty in the firmware.
The server is on latest firmware and latest BIOS.
I have above 4g decoding enabled and uefi set.
Some people have told me to enable rebar, but I can’t find this option in the bios.

I’ve rebased the cards in different risers and measured that the GPU power plugs have the right voltages.

I would appreciate, if anyone can confirm or deny that these cards work in this hardware and show me which bios setting I’m missing.

Did you find this thread?

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have you tried adding one at a time, does even just 1 not work

I did. It doesn’t apply to my case, because they are looking at the OS level and I can’t even get the firmware to recognize anything in the PCIe slots.

Yes, even with just a single card, I still doesn’t show up.

I created a ticket with both Gigabyte and AMD, to verify support for the GPUs on the server.
AMD came back and said, they we’re not officially supported and Gigabyte said, they should work.
Which doesn’t help either way.

Have you tried booting into Linux and seeing what sudo lspci says

Can you set you CSM to custom and then set video opt from to UEFI rather than full disable cam/full UEFI

Yes, there’s nothing there.

You lost me. Can you explain in more details?

See the referenced BIOS images for CSM setting that worked for me.

This is what I already tried. I have above 4g decoding enabled and uefi set.