AFAIR sotb aren't 50fps game, so it's a bad example.
SOTB is THE classic example of a 50fps game... absolutely STUNNING graphics.
Anyway, 75fps is even worse than 100 - some amiga frames are displayed for 1 monitor scan, others for 2 scans.
You have the only set of human eyes that can see movement above 25 frames per second... Ahhhh, movies must suck for you :lol:
As long as 100 frames per second are displayed with two of them being the same, you'll see a jerking sprite. If you can't understand what I tell about, just take a good 50 fps TV with the real amiga and compare games and old demos - with winuae at 100 fps display mode. The thing is: for the really smooth-looking EVERY next frame must differ - in every other case there WILL be jerking.
Ok, I'll try and explain it to you :-)
The human eye can't register a descrete change if it happens faster than 40ms, which is one 25th of a second. by running at 50fps you eliminate any aliasing between the frames, which gives the impression of super smooth animation. Anything over that just reduces the aliasing further...
If you run your PC Monitor at 100Hz, and UAE generates it's screens at 50Hz, so that the PC monitor is showing one Amiga frame for every two Monitor frames... you still have 50 frames per second...
I even doubt now you really had a real amiga and saw real oldskool 50fps demos there and played 50 fps games =))))
You don't want to know how many Amigas I have :-)