Hum ok, I think I don't need, I use value='IvyBridge' with my Ryzen 2700x. With patch For AMD, I get bad performance versus ivybridge ..
@ghost82 Do you Try VMXNET3 with Big Sur ?
My QNAP 5Gb work !! 300MB to unraid but it's not the best configuration I think (Unraid 10Gb to switch to BigSur (Unraid VM) with 5Gb ,, :D)
Erratum, crash again with my Qnap, very bad driver