V620 won't POST on B550 (Gigabyte B550M DS3H AC R2)
I bought a V620 back in August and I've spent over a month troubleshooting it trying to get it to post. The 40mm fan in the shroud mod and the case fans will spin, but nothing will happen. After around 10 minutes a loud beep goes off and an orange LED at the back of the GPU lights up.
System specs:
- CPU: AMD Ryzen 5 5600 (no integrated graphics)
- Motherboard: Gigabyte B550M DS3H AC R2 (on latest BIOS F4c)
- RAM: 16GB
- PSU: 1200W
- OS: Proxmox
I've researched and tried every possible BIOS setting to no avail.
- Above 4G Decoding: Enabled
- CSM Support: Disabled
- SVM Mode: Enabled
- IOMMU: Enabled
- DMAr Support: Disabled
- PCIe x16 Slot Config: forced Gen 3 (tried Auto/Gen4 as well)
- Re-Size BAR: On
- I see suggestions to disable SR-IOV, but my board doesn't have that option.
The weirdest thing is that I also bought a V340 last week and it works perfectly without having to fiddle with any of the settings. I can boot headless and ssh in with the V340, no problem. As soon as I swap in the v620, no dice.
The only progress so far is that with the new 1200W PSU (upgraded from a 600W) and the current BIOS settings above that I just applied, there's at least now a solid blue LED that shines on the back of the GPU when I turn on the PC, but it still doesn't post. I haven't left it on long enough to hear the beep/alarm, but
I found this Level1Techs thread describing the exact same symptom with the V620 on AM4, blue LED, POST hang, other GPUs work. No resolution there either.
Does anyone have a solution. Its been a month and a half and I'm at my wits end. I would appreciate any help.