^^^ From that review:
"The problem lies in that StarCraft II will only utilize two cores and as a result a Phenom II X4 965 will not be any faster than a Phenom II X2 555. This proved to be a real issue for older quad-core processors like the Core 2 Quad Q6600, which delivered very poor performance even when overclocked to 3.0GHz. When testing we found that a minimum frame rate of 30fps was ideal, sadly the Q6600 only allowed for a minimum frame rate of 22fps when coupled with the mighty GeForce GTX 480. "