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Guest
Processors that only support 2 threads will take a hit as our Phenom II X2 560 delivered 42fps, almost 20% slower than a similarly clocked Phenom II X4 processor. However we were surprised by how well dual-cores performed when compared to other recently tested games.
This is a flawed conclusion since it looks as though the game is getting GPU limited at ~ 50 fps on your GTX 580 and the settings you used.
For a CPU benchmark you need to bench the game at a lower resolution and/or lower settings (medium settings) to make sure the benchmark is CPU limited rather than GPU limited. With the GPU limitation holding back frame rates on the quad cores it's impossible to tell how much faster the quad cores are over the dual cores CPU's. At lower graphic settings the Phenom II X2 may be much slower than 20% compared to the quad core Phenom II X4.