The H.A.W.X. results look similar to Left 4 Dead. This is a CPU-limited game that can't quite get by with the Athlon X2 3800+. However, a 600 MHz frequency increase really wakes things up.
Even at the highest settings, H.A.W.X. plays well on the Radeon HD 4650 and Radeon HD 3850 all the way up to 1920x1200.