Making infinity cache perform better ? This is not trivial when done outside the driver. It would be interesting to test the RX6900 with early drivers then with the latest beta ones, and see the difference - +10% from drivers, +7% from clock speed + throughput would make a lot of sense, actually.
Not that I would care, as I'm running open source drivers - even a 6 years old card (RX480 8 Gb, reference + 3rd party cooler, no voltmod) keeps getting performance optimizations, so much so that I really am under no pressure to replace it other than the fact it might give up the ghost before then.
I'd also really much like to crank up the framerate @1440p a bit higher, but I'm not ready to spend twice the amount my current one cost me back then simply to gain 20 fps.
And no Nvidia for me - on Linux, their drivers are crap nowadays.