Help with GPU PCI-passtrought

Operating Systems & Open Source Virtualization
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Hello all,

I have problem with GPU PCI-passtrought. My system is using Proxmox 7 and want to passthrough the GPU2 to Win10 VM also IOMMU and AMD-V are enabled from the UEFI.
My system specs:
CPU: AMD FX 8300
MB: ASRock 990fx extreme3
RAM: 32GB DDR3
GPU1: Nvidia 210 (for the host)
GPU2: Radeon HD6870 Power Color
Because the GPU has 2xDVI, HDMI and DP does is meter where will plug the VGA dummy plug?

These are the details about the Win10VM:
Machine type: i440fx 6.1
Bios: SeaBIOS
Virtio SCSI controller
Added also Radeon HD6870 GPU as PCI device with these functions enabled: All functions, Primary GPU, ROM-bar
At the Proxmox host added these attributes to the GRUB cfg: “quiet iommu=pt amd_iommu=on”
Also created a VGA dummy plug for the Radeon. The problem with the GPU passthrough is that the Win10VM detects the GPU and the driver’s are installed without any issues but I can’t open Ati Catalyst Control Panel and when trying to start any benchmark like Furmark error appears “load library failed 87” also tried to rename atig6pxx.dll file in System32 folder in the Win10VM without any success. The same problems appear even without the VGA dummy plug if this meters. Tried and software Rainway but the program only detects the CPU.

Can someone help me with this problem?
Thanks in advance.

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many (most, not all) Bulldozer/Piledriver boards had odd IOMMU bugs in the motherboard. your issue could very well be due to this.

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UEFI is updated to the latest ver. But this bug is new to me will Google it.

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IMO VFIO passthrough with Seabios is a difficult beast. I thought I could get a virtual retro machine going (Windows XP, Win98) but I gave up after days of trying various host systems, GPUs, GPU ROMs and Never getting anything to display.

I think you best bet would be installing Windows 10 on a Q35 VM with UEFI support and after complete install passing through the GPU and disabling the virtual display. You most likley won’t get a boot prompt, the card might work after Windows boot / after the drivers are loaded. (I think only AMD cards of the 7xxx line or later are UEFI native)