My goal is to install two graphics cards, and eventually do GPU passthrough with one of them.
My cards are:
- NVidia GeForce GTX 1660 Ti
- Radeon RX 580
My system:
- Mobo: ASRock X570 Phantom Gaming 4
- CPU: AMD Ryzen 7 2700X
- 32G ECC memory
- Currently running Debian Linux
However, whenever there is any graphics card in the bottom x16 PCIe slot (PCIE3), the machine does not boot.
Note: it does get to the BIOS setup screen. However, after that the screen goes blank, and makes no progress. I do not see the GRUB boot loader screen, for instance.
In this hung state, there is a video signal (my monitor would show a “no signal” message otherwise), but it is blank. Also, the motherboard light is off, so it has passed all of those health checks. Lastly, in this hung state, the network light for the LAN is off (in case that is helpful).
Here are things I’ve tried:
- Nvidia card in the PCIE1 slot, alone - boots OK
- Radeon card in the PCIE1 slot, alone - boots OK
- Nvidia card in the PCIE3 slot, alone - no boot
- Radeon card in the PCIE3 slot, alone - no boot
- Nvidia card in the PCIE1 slot, Radeon in the PCIE3 slot - no boot (this is what I eventually want to work).
I have updated to the newest available BIOS version (P1.30). No change. I have reset CMOS. No change.
The manual indicates that PCIE3 should support a graphics card in x4 mode. But even with a single card in this slot, I cannot make it work.
Anyone have advice on this?
I contacted ASRock support, and gave them the above information, and I got a 1-line reply back: “Motherboard support no more than 2 video cards”.
So, either they misunderstood me, or they meant to write “no more than 1 video card”.
But from the documentation I find, and even the printed manual, the second x16 PCIe slot should support a graphics card. And even with a single card in the system, in that second slot, it does not boot.
So, the tech support does not seem… very helpful (:
Anyone here have ideas?