Tom's Hardware: Topic Crysis Warhead lagging in 32-bit system
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I had the same problem with a Ati radeon 4850x2, my setup had a quadcore and 4GB ram, I first intalled vista ultimate 32bits and it was horrible, 15-20 fps, then when i checked my ram it was only showing 2gb, that was because 32bits can handle up to 4gbs of memory (including GPU memory).
So i had 2gb of ram, 2gb of video ram and vista using 35% of my 2gbs of ram.
what worked for me was moving to 64bits, it takes all 4gbs now and vista only using 20%, I dont think you can run crysis at max settings with 2gb ram even if it is DDR3 (someone correct me if im wrong, but vista takes the same % regardless DDR2 or DDR3) get more RAM and try 64bits and...
first of all try to update your drivers lol 
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