How are you completely oblivious to the fact that your statement is 100% false. In some games yes, in other games HELL no.
So looking at these results, anyone would say even a 1070Ti is better for 4K gaming compared to the Vega 64. But let's ignore the fact the framerates are practicly unplayable wich makes the entire chart useless.
Now test the same game on medium on 4K and what do you know, now the game can actually be played on a budget and the Vega 64 is only loosing to the most expensive cards on the market.
Now, 4K gamers that buy this game, are they more likely to run it on Ultra, or on Medium?
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And no it's not the only game, have a look at the latest tombraider:
Ultra, 1070Ti wins against Vega 56 and Vega 64 is eaqual to GTX 1080, but framerates are barely OK by todays standard.
Medium, Vega 56 wins from 1070ti, and Vega 64 beats GTX 1080 and framerates are enjoyable.
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Now you can offcourse start an argument that you don't need 60fps or higher and that PC gamers want quality over framerate. Well then, then I have no counter argument becides the fact that almost every best selling monitor in Amazons Top 50 at the moment is a 1080p high hz monitor with one exeption, a 4K Freesync monitor. that's right, freesync, not Gsync.
Offcourse people play on Ultra settings. I'm not saying they don't. But do you dare to make the statement that Ultra is the most selected setting out of them all? Or do you dare to admit that low/medium is probably more likely based on the most selling hardware ( looking at amazon for example, or looking at steam hardware survey )?