I think something is seriously wrong with either the hardware or software side of things. I am getting massive stuttering (making the game unplayable) on west side servers where my ping is fine (~50). I have tried turning off every single eye candy, and playing on medium settings at 1920x1200 AND 1680x1050, and still garbage. I was using 11.9 drivers but i will try the newest ones now.
EDIT: hyperthreading has been off all along
and tried newest drivers
very very frustrating