Tested On The Expensive Version Of The RTX 3080 Ti
There are a total of five benchmarks in this review from Tweaktown, which is just enough to tell you all about trying to play Metro Exodus: EE at 8k. As you might expect all but one of the benchmarks were run with DLSS 2.0 enabled and while they do not mention BAR, as they were running on an ASUS ROG X570 Crosshair VIII HERO and Ryzen 9 5900X it seems a safe assumption that it was enabled.
With everything cranked up to maximum you can expect a blazing 21fps average, which climbs up slowly as you choose less demanding setting. The balanced preset brings that up to 25.5fps , performance to 30. and ultra performance a half playable 30.5fps. If you take DLSS 2.0 out of the equation and feed your eyeballs pure, uncut 8k you will see the original Crysis experience, with about 10 frames every second.
At this time, even if you could get hold of the hardware, trying to push 33 million pixels per second is still out of reach unless you are willing to seriously sacrifice graphics quality.