Re: CRYSIS DEMO Vista 64 DX9 Mode with tweaked Ini is the way to go!
Looks good, but I still prefer to play it in DX10 as I feel the overall scene is just more realistic looking. I can't quite put my finger on it, but DX9 just looks "flat" by comparison. I don't know if it's the lighting or what, but it just doesn't look the same to me. The scene doesn't look as alive. The distant mountains also look about the same to me as when 32-bit DX10 loads them in properly, but it might help to see it in motion.
Also, I don't notice this mouse lag that people keep talking about in DX10. Doesn't get bad for me until the frames drop below 30. Other than that, it plays fine.
i7-2700k @ 5.0 GHz
Nvidia GeForce 570 2.5GB Tri-SLI
Asus P67 WS Revolution (Tri-SLI)
OCZ Vertex SSD x 4 (Raid 5)
G.Skill 8GB DDR3 @ 1600MHz
PC Power & Cooling 950W PSU