At the announcement of Ampere graphics cards, Nvidia announced that GeForce RTX 3090 was the first graphics card to play 8K games. With only 10% faster than the RTX 3080, it’s probably about the same for the younger model.
Anyway, yesterday there were many tests on the most expensive GeForce on the web, including tests in 8K. There are not many tests, and they are often submitted without any diagrams or emphasis on graphics quality settings, which may be a requirement of Nvidia. In addition, most resources did not have 8K TVs because they were few and very expensive, so 4K screens with Dynamic Super Resolution (DSR) technology activated, which converts the picture to 8K, were often used. However, you can still find something on the web.
For example, in Death Stranding, Nvidia provides about 37 fps to 8K, and DLSS activation raises the figure to 70 fps! And this is on the Very High graphics setup. Doom Eternal gives out about 50 fps as Ultra, Forza Horizon 4 shows more than 60 fps as High, but Control, which even in 4K manages to load the same RTX 3080 very much, gives out about 50 fps, but it is as High Quality and with active DLSS. Without DLSS, the performance is unknown but it is likely to be below 25 fps.
So is it possible to play on GeForce RTX 3090 in 8K resolution? Yes, it is indeed possible. Even if you chase the notorious 60 fps, taking into account DLSS approximately such figures are available even in “heavy” modern games, not to mention less demanding projects. Even Control which in high permissions is one of the most exacting games, let and with DLSS, but nevertheless gives out more than playful productivity. Namely it is possible to tell that the era of 8K-gaming is open.
However, the same RTX 3080 allows about the same, because it lags behind the older sister only 10%, which means that 8K-gamaming is available with 700 dollars, although it is worth waiting for full tests, as RTX 3080 can rest on memory.
Needless to say, when talking about $700, you should understand that the price of a video card pales against the cost of the corresponding TV set, but this is another story.