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June 23rd, 2025 01:04
no-boot, no-video when adding an AMD Instinct MI50 in my 7820
I have a Precision 7820 workstation with 2 Xeon 4110 CPUs and an AMD WX3110 video card. It's working well with Proxmox (Debian Linux).
I bought a brand new AMD Instinct MI50. As soon as I install it in the workstation, it refuses to boot, and displays nothing, not even de Dell logo, on the Displayport output of the WX3110.
I had disabled Secure Boot to install the OS, so this is not it.
I tried these:
the WX3100 was originally in the 1st PCIe slot (the one closest to the CPU), and the mi50 in slot 2. No video.
I moved the WX3100 in slot 2 and the mi50 in slot 4 (following the engineering diagram from this thread in the Dell forums . Still no boot.
I tried setting "legacy option ROMs" (AKA CSM), no effect.
Nothing works until I remove the card. I can't try this solution, because the workstation never makes it to try booting so it never goes through the "missed boots".
Anybody has an idea of what is going wrong?
compute_work
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July 7th, 2025 20:38
I have found a solution, but it makes no sense at all. Anyway, it works so here goes:
The MI50 accelerator has to be in a PCI slot BEFORE the WX3100.
It works with the MI50 in slot 1 with the WX3100 in slot 5, and the MI50 in slot 2 with the WX3100 in slot 4. Probably some dumb bug feature in the UEFI or POST routine needs the last GPU to have display capability before the real boot process is launched.
Chino de Oro
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June 24th, 2025 07:34
Test with the second CPU riser removed. With both CPU installed, the graphics slots are limited to 160w max.
compute_work
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June 26th, 2025 13:25
I tried with only the MI50 in: still not making it to the OS.
I have set the front fan at +50 in the BIOS in advance, since this card is passively cooled. Because of that I am certain it makes it to some later point than POST, because the front fan spins up after a few seconds.
Is there some way to diagnose what is going on? Fiddling with the hardware and booting blind is not very productive :(
compute_work
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June 26th, 2025 13:47
@Chino de Oro I misread your post, sorry.
I tried with both GPU and only one CPU: it still does not make it to the Dell logo. The complete system takes 137 watts of power, measured at the plug by my UPS. This does not seem like much on a 950W power supply.
I also tried hooking each of the MI50 power inputs to it's own VGA power connector, instead of using a splitter on the PCI 6-pin end of the power cable. Same results.
Chino de Oro
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June 27th, 2025 00:13
Besides security (UEFI) and the power restriction could hung POST, I can't think of other reasons. Next step will be testing the MI50 in a different system to see if you got a faulty unit.