If you turn on extreme anti-aliasing then yeah, it might struggle, but guess what? Anti-aliasing ain't that important on 4k.

I agree with you, aliasing is obviously less noticeable at higher resolutions, simply because the pixels are smaller (or the pixel density is higher, whichever way you want to see it).

It's just common sense but if anyone needs proof, they could look at the pictures here (e.g. look at 8X MSAA 1080p vs only 2X at 4K, yet the latter has less visible aliasing): https://www.extremetech.com/gaming/180402-five-things-to-kno...

Lucky you! Head over to /r/nvidia and read which games just can't cut it on 4k@60 Ultra.

Which ones though? Tbh I do have a 4k gsync so that does help when fps goes below 60. I find anything from 50-60fps to be smooth and below 50 it starts to get too choppy. It also helps with the input lag to run gsync @ 58fps. The most current game I run ultra is far cry 5, it's a pleasure @ 4k.

It's a graphics card running a computer program.

Did you expect it to run everything forever at an extremely high resolution with 60fps?

Why are Nvidia releasing new cards then?

Ultra is ridiculous and unnecessary. I play 4K60 on an RX 480 with "smart" settings — max textures/meshes, min shader effects, no ambient occlusion, no dynamic reflections, etc.