I suspect the results just illustrate that the ivy-bridge systems are memory bandwidth bottlenecked in certain games compared to the AMD system. (25GB/sec versus 30GB/sec + 8GB/sec HT).
This is no different that a computer program that needs more RAM than physically available in the system, and the bottleneck being the HDD speed that the pagefile lives on.
If they are also offloading the physx stuff to the CPU, then this might have an even bigger impact on reducing the GPU workload and getting the best of memory bandwidth and the overclock.
They should add a sandybridge-EP system to the tests as point of reference.
#9326791, By Getting back into the PC building game