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For those having problems with Far Cry 3 the solution is simple, as the game is poorly programmed you need to run the game locked at 60fps with vsync enabled.
Anything other than 60fps locked causes all sorts of problems.
I believe this is because the game engine is optimised for consoles (like Skyrim) and does not like high frame rates.
You got the full name of the .inf?
Have a look if sapphire made a ghz version of your card and have a look in the tpu bios directory for a download, should boost your clocks
As for driver, 13.4 w/ cap is the safe choice though 13.5 has been fine for me