Unit stuttering

I have an HP pheonix with 16GB RAM, i7 quad core processor, an AMD 6850 graphics card so I figured it would be overkill with NTW. I load up a battle on ultra high>FPS is stunning, zooming around map is smooth as can be BUT the units...they stutter when they move, most noticeable with cavalry, they seem to move in teleports of one metre or so and it also affects every single infantry/arty unit. I tried dumbing it down to low settings and the FPS is still awesome but the stuttering is still there! The units simply can't move smoothly, in fact even when they are stationary and the men are just chilling they can't brush dust off their clothing without stuttering. My machine is blatantly capable of running NTW, and it produces great FPS+loading times but it can't even make the units run smooth -_- .

Strangely, my old PC which had 2GB RAM, 2.33GHz processor and a Geforce9600GT graphics card could not run ultra settings without dying BUT it was quite capable of producing smooth unit animations!

Most FPS problems are to do with machines that are too old or with low specs, can someone please explain why this is happening with an overpowered computer?

I have this problem as well, linking DXdiag in the post.

There is a thread in the Basement dealing with a new build for a member. Stuttering in games has been brought up but not Napoleon in particular.
The things brought up depending on who is posting have been overclocking cpu, using SSD, and 64 bit Win 7 for three of them off the top of my head.

I have same problem. From what I can tell, it's AMD driver issue. I can fix it by lowering particl effects to "High"

I fixed this problem on my old PC by lowering the number of sound channels.

Seems this issue still hasn't gone away, eh? I still have it as well. Easiest to see it when you have your camera follow behind cavalry that are running. They appear to repeatedly 'teleport' a few meters ahead. I don't think it's limited to AMD though. I have a i7, 8gb RAM, GTX 560M, Realtek sound and Win 7 64-bit. Tried everything at this point and no dice. Let me know if you find a solution.