Question No video output from discrete GPU on Supermicro X11DPH-T ?

[brodyblum13]

I can't get any of my known working discrete GPUs (from both AMD and Nvidia) to give me any hdmi video output in any 16x pcie slot on my Supermicro X11DPH-T. I can get VGA output from the onboard graphics, however. Is there anyway for me to get output from my dedicated graphics card? I already tried switching VGA priority from onboard to off board in the BIOS. I'm using 2x Xeon Gold 6132 CPUs. I've tried a 6950 XT, a 3060, and a 1660 Super.

Theory: A quick check in the bios will show that out of the 8 dimm slots that are occupied, only four are actually working, which means I have at least 4 dead slots. This could be a CPU error, which not only disables my DIMM slots, but also causes PCIE slots to malfunction. Alternatively, could this be the reason for no video output?

 

[Misgar]

What OS are you running?
Are both Xeons working?
You have 16 DIMM sockets and 8 DIMMs. How are they distributed? 4 DIMMs per CPU?
What type of DIMMs? ECC, non ECC, RDIMM, LRDIMM, DCPMM? Don't mix types.
Have you tried an old GPU with DVI output (instead of Display Port or HDMI)?
Use a PCIe NIC to check all slots.

 

[brodyblum13]

I've tried every OS under the sun, Windows, Gentoo, Ubuntu, etc. No video output from HDMI on any of them, except I can see the Ubuntu logo for a bit, and windows gives me hdmk output, but there is only an illuminated screen.
4Dimms per CPU, all the same brand (innodisk) ECC RDIMMS
I can see both Xeons in BIOS, and all 56 threads are shown in one of Ubuntu's monitoring programs
I haven't tried DVI output.

 

[Misgar]

It's been more than 20 years since I owned a couple of SuperMicro boards. The reason I suggested a DVI card is because it's not much newer than the vintage console VGA output on the mobo. HDMI is slightly newer and there may be something in the SuperMicro BIOS that doesn't work well with it or Display Port. Just a guess on my part.

I've had incompatibility issues with HDMI and an old Panasonic plasma TV. The HDMI input only became active after POST ended and Windows started loading. The VGA input worked fine from power on.

 

[brodyblum13]

It's been more than 20 years since I owned a couple of SuperMicro boards. The reason I suggested a DVI card is because it's not much newer than the vintage console VGA output on the mobo. HDMI is slightly newer and there may be something in the SuperMicro BIOS that doesn't work well with it or Display Port. Just a guess on my part.

I've had incompatibility issues with HDMI and an old Panasonic plasma TV. The HDMI input only became active after POST ended and Windows started loading. The VGA input worked fine from power on.

I actually found a DVI gpu I'm gonna try it