Frame rates higher than 60 require disabling V synch, no? My understanding is that causes rubber bullets and other issues.
Max, that's true if your monitor does 60Hz. On a 144 Hz monitor the cap is 144 fps.
Why is that and what do those numbers mean?
The Hz value tells how many times per second the monitor refreshes the image. It's a stable pulse, independent of the video card, and applies for still images as well. V-sync synchronizes the video card with the monitor, limiting the fps to what the monitor can do. If your video card is weak, the same image gets refreshed more than once resulting poor fps. Disabling V-sync and using a powerful video card will cause tearing in moving images since the state of refreshing is different in various parts of the screen. See, the refreshing doesn't flash the entire screen simultaneously, it starts at one point or row and continues until the entire screen has been refreshed. V-sync forces each image to be finished before it allows the next refreshing. And this happens 60 or 144 or even 240 times each second, depending on the monitor!
