Indeed, I think that you can definitely see the difference between 25 and 50 fps... even 24/25 fps and 30 fps don't exactly look the same. The 60/72/75/... Hz

Indeed, I think that you can definitely see the difference between 25 and 50 fps... even 24/25 fps and 30 fps don't exactly look the same. The 60/72/75/... Hz (some screens could display 85 or even 90 Hz) of the Windows 95 epoch was the refresh rate of the CRT tube: the higher, the less flicker. Once you tried 75 Hz, you clearly didn't want to go back to 60 Hz (or at least, that was my experience).