Very simple way of how to achieved a variable framerate while Vsync is enabled in Assassin's Creed IV Black Flag. Just ctrl+alt+del out of the game, then alt+tab back in. Alt+tabbing out will not work, it needs to be ctrl+alt+del to minimize the game.
Another option that worked discovered by NefariousInsanity,
is to have task manager in background then holding alt+tab letting go of tab and clicking on the screen with left or right mouse. This should allow v-sync without the 30fps lock.
My specs
i52500k @4.5GHz
nVidia GTX 550 Ti
4Gb DDR3
Win7 x64
Here's my Assassin's Creed 4 Black Flag Metal Cover. It's the music from the main menu. http://www.youtube.com/watch?annotati...