I'm sorry to hear that.
Did you just install the driver or did you uninstall the previous (which I suppose is 19.1?) one first?
Are you still getting those regular DPC spikes at 6000+ every few seconds even with this driver?
Has anyone else tried it?
Here's how it looks for me right now with 20.4.1 driver package:
... and here it's how it used to be with 19.3 - 20.3 drivers