@maddy What Dell OptiPlex SFF do you use PCIe passthrough on (and do you use coreboot)? I ask because I couldn't get it to work on my librebooted OptiPlex 9020 SFF with the same NIC (Intel X520-DA2)

@noisytoot Huh, that’s strange! I’m using an Optiplex 3050 with stock BIOS/UEFI, booting Proxmox in UEFI mode with secure boot enabled.

@maddy I think IOMMU might just be broken on coreboot on the 9020 specifically, there’s also a known issue with graphics cards not working unless you boot with intel_iommu=enable,igfx_off. I also have a 5050 SFF (which I think is basically identical to the 3050 but the built-in NIC is Intel rather than Realtek) which I ported coreboot to, but I haven’t tried PCIe passthrough on that yet.

@noisytoot Ah, that’s a shame. Hopefully it works on the other one, if you end up trying it out!