S!
How about VSync On results? Those would be interesting to see as well. The SSAO offers little to nothing in IQ terms compared to the FPS hit it causes and stutter inrease. I disabled HT on my i7 too, seemed to cure a lot of things in games. Grass is the big stutter thing in CoD when you fly low. It is drawn as a "circle of LOD" around you like everything else (houses, tree shadows etc.). I keep it off as the grass is rarely seen anyway. Good for screenshots I guess
A nice rig you got there though. I use 16Gb DDR3 in dual channel and hard to say if it did anything as I had 8Gb before.