bycha said:
Uhm... Is this real? U can't have 45? It's only 60, 30 and below 30? How many of this gen games have V-sync activated?
yup, it's real. Refresh rate in games is in synch with the tv raster; think of a brush which paints the screen moving from the top to bottom 60 times per second.
A game can refresh at 60fps (one frame for each rasters pass) or 30 (once every other rasters pass) or 20, 15, 12, 10...only exact submultiples (is this a word ?) of 60. Which means the only available refresh rate immediately below 60 is 60 / 2 = 30.
If at some point a 60 fps game drops to 57, 58, then it has to drop to 30.
Think of JSRF on pal xbox's; when you're playing in Pal 60 mode you'll experience many slowdowns during which the game runs at 30 fps when it can't render 60 or more fps.
However, it seems to always manage to render internally at at least 50fps, and that's why in Pal 50hz mode there's absolutely no slowdown.
I'd say 95% of games have V-Sync enabled; you can say it's not when you notice the infamous 'tearing' effect; this happens when the refresh rate of the console drops and goes out of synch with that of the tv; this results in the the screen displaying 2 different frames at the same time; one frame in the upper part and the next frame in the bottom part; this happens because the new frame arrived 'late'; it arrived when the raster was already in the middle of the screen and had already 'painted' its upper part with the informations it had (the old frame).
Gt4, ninja gaiden, mgs2, splinter cell are a few examples of games running with V-sync disabled OR in fact with some kind of dynamic v-sync (enabled when the console can output 60fps or more, disabled when it drops below that).
You'll notice some tearing from time to time, but no real slowdown.