Crysis Warhead 64-bit mode?

ambam

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The latest patch for Crysis Warhead gives you an option to run the game in 64-bit mode. What does this mean and how do you benefit from it?

I've got a Core i7, 6GB RAM, and Two HD 5870's in CF, I can run Warhead on all "enthusiast" settings at 1920x1080 at between 35-60 fps. I haven't tried the 64-bit to see if it improves performance in any way.
 

55Range

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It will make use of more ram on 64 bit, with 6 gb ram, as 32 bit only allows use of 2 gb per program, and 3.25 as of total.