Graphical artifacts (Big Sur)

Hi everyone.
Got Big Sur working on Ryzen 7 3700x and GTX 660ti (Kepler) but while everything apple works great, getting some serious graphical artifacts. Adding the correct shikigva=256 boot arg helped, but after some time the artifacts come back.
Waiting for the update on Monday to help with this, otherwise I'll just revert to Catalina.
If you have any idea how to fix this now, please share ♥.

submitted by /u/Shadehater
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