What kind of system do you need to play 4k 60fps? Is that switch or wii u emulated?
Wii U emulated for those two. For the switch emulator I use two Yuzu and Ryujinx. Yuzu can be a shyt show like Smash Ultimate plays good on my system but it crashes after awhile because the emulator has a memory leak in the game. Also with the Yuzu emulator especially with a game like smash it can start out a bit stuttery since it's got to build the shader cache. The more shaders it builds the better it runs.
I have a 3070 and an 8 core 16 thread Cpu Ryzen 5900HX. CPU is more important when it comes to emulation.
The graphics are A1 on my mediocre build (AMD Ryzen 5 1600 & GTX 1060 6GB). I noticed the FPS dropping and the game would stutter a bit but on the second play it was almost flawless
I played Mario Kart & Mario Golf so far & both work well. I'm looking forward to playing BOTW for the first time. I've heard great things.