GPU passthrough working for 2 GPU but not for 1

Hi !

I'm trying to set up a GPU passtrough to a Win10 VM. I've followed all instructions and procedures, and it's partially working, but I've got a weird case and no more clues...

The host has 2 video cards :

1. A GTX1660 on PCIe slot 1
2. A GT640 (Asus GT640-2GD3) on PCIe slot2

When I add the GTX1660 to the VM, it works, and I get video on the screen connected to it

When I add both the GTX1660 and the GT640 to the VM it works only if the GTX1660 is declared as hostpci0 and GT640...

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