They used a very weak CPU(most likely some AMD APU) because all mantle does is free the CPU of tasks.
If they used a gaming CPU from Intel(like in most gaming rigs) the difference wouldn't be nearly as big. That's why they chose a very CPU heavy simulation. You will not see that kind of difference in games where the GPU is the bottleneck(aka all games that matter).
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.







