More than the firmware it depends on the panel Intel drivers suport 50 hz, but of the panel don't, it doesn't matter. Anyhow, I tried uae at 60 hz in RA and didn't notice big issues. I have an amiga 1200 at home, so I know the system. Winuae has improved a lot and works quite fine with 60 hz panels. I didn't test C64 though, It's not a system I am intererested in.
First, thanks for giving it a go.
Unfortunately the "didn't notice big issues" is very different from "noticed accurate PAL 50Hz emulation". It is technically impossible to accurately emulate a PAL system on a 60Hz screenmode when VSYNC=ON.
With regards to your test. You didn't notice anything in Retroarch because it disables VSYNC when the refresh rate of the host differs by approx more than 2Hz from the emulated system (it does this without letting you know, it is determined by the "audio skew" feature in audio options). Your test was effectively with VSync=OFF.
I think your comment on Amiga / WinUAE will make real Amiga enthusiasts cringe (at least it did for me
). The crux is having VSYNC = ON. In WinUAE you need to turn "Low Latency VSync" ON in WinUAE display properties (it's in the list button, see attached picture). Do you have a real PAL (50Hz)
1200 to compare? You'll notice that the video is being sped up by 20% in the emulation and the audio PITCH being raised by 20%. A big no no for any Amiga fan.
The Win 2 really needs a 1280x720 @ 50Hz screenmode for the very reasons given in the first post.
I mean if a game is 60 fps full-speed on 60Hz screen, would it still full-speed on 50Hz screen with 50 fps, like for emulator where Pal and NTSC have 60 fps ?
I'm not even sure it works like that, but in Cemu there isn't 50 Hz or 60 Hz option, so games requiring 60 fps will still require the 60 frames to be full-speed.
You would have to look for whether the emulator supports PAL/50Hz emulation. I don't think Cemu supports it. I'm not sure, but I think Dolphin (Wii emulator) has proper PAL support.
Nonetheless, when a system supports 60Hz games and your system is capable of running them at >60fps, then it's the preferable rate.
50Hz display refresh is needed mostly for accurate emulation of PAL games on systems that do not offer any USA/Japan NTSC counterparts. For example the Commodore Amiga (WinUAE), where 95% of the games were only released for the PAL 50Hz region. No NTSC counterpart to be found.