Cliffs of dover beta game

[Warhound]

Did you upgrade your OS too? If you're still running XP or even Vista they are a likely cause for at least 50% of your problems with CLOD.

Know it's too late now, but you'd also have been better off not buying a 2600k (try disabling HT btw ,some reported it to ruduce stuttering) and going for a 2500k or 2400 and spending the difference on a better card.
560ti or 6950 ,even a 5870, would have been a better pick. Preferrably with 2gb+ ram..your 1gb will be filled up in no time with everything on high,SSAO on etc and a decent resolution.