With that old phenom you might have some problems, but probably not..
I remeber my 8800gt at stock clocks, with a AMD 4200+ socket 940 dual core was playing crysis on high smoothly so you should be fine.
When it comes to have fluid crysis gaming, getting that 4 Ghz quad and 2 Mega nvidia cards which i did and you get 60+ Fps in crysis which is ultra smooth.
When it comes to operating systems, from my experience with crysis, which i have alot of it, My best fps benches and game play were on XP32-bit OS. Windows 7 should drop you 5- FPS in DX9 crysis, and playing crysis DX10 should do another 6-12- Fps drop for you......
Windows vista and 7 are good performers but they take hidden resources and tend to get lower fps in crysis and other games.
Even if you play crysis in 32-bit Dx9 mode itll be slower in 7 then in Windows XP 32-bit mode, also some people say you sometimes get better FPS in vista and 7 using dx9 32-bit mode, but after installing my os 10+ times and the game itself i can tell you thats almost a mith and ive never seen thread proof of it..
Now dx10 in crysis is litteraly piontliss, It cuts and chops Fps like no other my friend, and its all for a FAKE very high setting. Using dx9 will give you a fps boost ive seen up to 15+ fps easily and going and getting a Ultra High config file of the net is easy, which allows you to have very high settings in dx9 then using dx10's very high and yet haveing better performance and looks, thats right, hacked ultra high in dx9 crysis-better performing then very high dx10 crysis.
But to get the best performance for crysis multiplayer and single player, Grab a good e8000 series dual core, Stay on windows XP 32-bit, and use dx9 crysis ultra high configs, and youll get the best of FPS and looks all in gameplay. Your phenom is good but id grab the e8500-8400 in a heart beat.
rockout
