And what? Do you read my post? Do you see that my rx470 work fine, but 480 cant, and both cards have 8Gb vram!
What's GPU1? How many GPUs in your system? For Windows you need at least 6GB per card for swap.
4x470 8Gb works fine on widows 10 4 Gb Ram and 40Gb swap
4x480 8Gb cant work on widows 10 4 Gb Ram and 40Gb swap
And now understand? or ...