The article says the game has native support for Vsync, but the in-game Vsync option does nothing for me. I can enable it and still get 1200 frames per second and screen tearing. I'm not sure if this is because I'm using Windows 7 (64 bit), or because I have an AMD graphics card (HD 7950), so I'm not sure what the article should say about it. I'm assuming Vsync works for someone, because this fairly comprehensive article says nothing about it being broken. Maybe someone who knows more about the game could look into this.
Topic on Talk:Far Cry
Have you overridden Vsync behaviour in the Catalyst Control Center? That's one cause of Vsync not working in games (I don't have this specific game to test).
Vsync in Catalyst Control Center is set to "Off, unless application specifies" (which is the default setting). Changing it to "Always on" doesn't help with Far Cry (just as it doesn't help with many other games). I was able to force Vsync in Far Cry using D3DOverrider (but then the game stutters a lot). I tried using RadeonPro as well, and had some success, but using RadeonPro at all seems to cause the game to crash when I quit. I should also mention that I have been using the Steam version of the game (which claims to be v1.40). After installing the 64-bit Upgrade Patch, in-game Vsync remains broken and not even D3DOverrider or RadeonPro will help.
Strange. I never had this problem when I tested the game on my 570 last year.
Try setting a framerate cap in combination with D3DO vsync using MSI Afterburner RTSS.
Is it possible the refresh rate the game is detecting with the resolution could be causing a problem?