Monitor audio dependent on PCIE gen?

Oct 13, 2018
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Ryzen 5 2600
Gigabyte Gaming G1 GTX 1080
MSI B450 Tomahawk
Acer Predator XB241H, connected by DP

I've moved my GPU from PCIE_4 (2.0) lane to PCIE_1 (3.0) lane.

Everything seems to be working okay except the audio from my monitor isn't recognised anymore.

I've moved them back and forth a few times and it recognises as soon as the GPU is in the PCIE 2.0.

Any reason for these audio issues?