Same for me... Before using the adapter most of the games worked fine, without any pixelation.
My Rig:
- Intel Core i7 2600K 3.4Ghz Box Socket 1155
- Asus P8P67 B3
- Gigabyte GeForce GTX 970 Windforce 3X OC
- 8GB RAM
I know that this is not the best rig ever... but at least works well until now and I can read any text in HTC Vive Pro when I'm wired... but wireless all is ugly and pixelated as hell.
Tested in all PCIe sockets (all of them are 2.0).