Ati 6970 2gb and hexacore cpu still stutters

[FlushMeister]

Hello gents!
My curiosity took over today when I installed a radeon 6970 2gb intpo my 2010 mac pro with a 3.33 hexacore W3680 cpu and 32gb RAm and windows on a corsair SSD

Unfortunately rthe new card an XFX radeon HD6970 3gb causes just as much stutters when grass is turned on, as my old 5870 1gb card

the thing is when I turn all settings to the lowest and even run 1280x720, if i have grass checked at that setting it still causes stutter. unchecking grass gives me a very smooth gameplay though.

The silliest thing is that I never really see grass when flying, only when on ground and crashing lol, but it has really made me nuts and i want to know what else coudl be the problem?

I've seen youtube videos where people seem to fly just fine on 6970's so there must be something else?

I tried to change the affinity in task manager just to see if COD doesn't like all 12 virtual cpu's, I also set Launcher.exe to high priority but no changes at all.

I've also tried changing the catalyst settings with no luc so I'm clueless.

Luckily I can return the card (otherwise I wouldnt have tried hehe) but surelly my specs should be able to run stutter free with grass no?

I know Il2 is buggy, but since i saw so many videos with smooth gameplay I thought the graphicscard was the issue here.

Thanks!