I'm having trouble with my PC setup where my second GPU, which doesn't require external power, isn't being recognized in the BIOS. Here's my current configuration:
- CPU: Ryzen 7 9800X3D
- Motherboard: Gigabyte X870 AORUS Elite
- One NVMe drive installed in the top slot, and no additional drives
- First GPU (in the top PCIe slot): RTX 5070 Ti
- Second GPU (in the second PCIe slot): RX 6400 or RX 460
- I've also updated to the latest BIOS.
The issue is that neither of my non-powered GPUs are detected in the BIOS, though the fans spin up, indicating they receive power. They've been tested and do work in the primary x16 slot. I know the second slot works fine because it recognizes powered GPUs like the RX 480 or GTX 1080 without any issues.
I've already tried a number of troubleshooting methods: disabling PCIe ASPM, adjusting manual Gen3/Gen4 speeds, using legacy ROMs/CSM, disabling the iGPU, and trying bifurcation (switching from x16 to x8/x8), but nothing seems to help. I'm stumped—any ideas on why they're not working?
1 Answer
There might be a power limitation with the second PCIe slot that isn't enough for the GPUs to work properly. What purpose do you need the second GPU for? If you're aiming for a dual GPU setup, consider getting a GPU that requires external power, as that should work better for you.
I initially thought it could be a power issue. I'm looking to set up GPU passthrough on Linux, and I need a low-cost DSC-capable card for display only. Looks like I might need to invest in something with external power after all.