The answer is that Crysis is still a challenge even after all of these years and your graphics card is inadequate. In fact, my GTX590 is sort of inadequate.
However there is one other possibility and this is not widely known. If you are using a certain type of display and you have VSYNC enabled, Crysis may be misreading refresh rate data from the screen and capping your frame rate at 24fps. The solution is turn off VSYNC, period. This bug exists in Crysis, Warhead, and Crysis 2. It UTTERLY sucks.
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