RyderForNow

Yep, it was a weird platform bug that occurred with two GPUs (plus iGPU, so three) connected. I rebuilt my water loop with just the 4090 and it worked instantly.

Hi all, I'm posting this in the general support forum since the origin of the issue might not be the QEMU/KVM engine, as suggested by the 7f error when running lspci. My Gigabyte 4090 OC arrived yesterday and I installed it in my system - but when I try to pass it through to a VM, I get the error message internal error: Unknown PCI header type '127' for device - i.e., a reset error. dmesg shows issues with setting power states: [ 411.181540] vfio-pci 0000:03:00.0: Unable to change power state from D3cold to D0, device inaccessible I am able to boot into bare metal Windows without any issues (display output works, ludicrous performance as expected). On Arch Linux, the display output does not work (probably a driver issue), but lspci works without any issues. As I said above, lspci -nnv returns: 03:00.0 VGA compatible controller [0300]: NVIDIA Corporation AD102 [GeForce RTX 4090] [10de:2684] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Gigabyte Technology Co., Ltd Device [1458:40bf] !!! Unknown header type 7f Memory at e9000000 (32-bit, non-prefetchable) [size=16M] Memory at f000000000 (64-bit, prefetchable) [size=32G] Memory at f800000000 (64-bit, prefetchable) [size=32M] I/O ports at e000 [size=128] Expansion ROM at ea000000 [disabled] [size=512K] Kernel driver in use: vfio-pci I'm temporarily running a 2080Ti (vfio) and my 7950X' iGPU alongside the 4090 - I doubt this is of any relevancy, however. CSM is off, my card does not seem to be affected by the 4090 blank screen issue (the NVIDIA VBIOS updater states that my card is updated), Above 4G decoding and Resizable BAR is on (toggling CSM or ReBAR did not fix the issue when I tested it yesterday). blackout-diagnostics-20230711-1352.zip

I've had a good experience with MCX354A-FCBTs (likely the dirt cheap model you saw on eBay). I haven't been able to test file copying accurately because my NAS is currently on a pretty outdated CPU, but I'm getting 28-32Gbit over iperf3 (MTU 9000, 10 parallel streams, virtualized client). Keep in mind that the cards aren't supported anymore, so if any issues were to pop up, you'd be out of luck in terms of updates or support.