AMD CPUs are weak, very weak compared to Intel. Therefore, the weakest spot of the PS4 (and X1) is the slow AMD CPU. GPU computing helps to transfer CPU load to the GPU which will speed up the X1 and PS4 a lot. Since the PS4 has much more shaders it will also benefit more from GPU computing.
Many types of calculations can be transfered from CPU to GPU in theory but the development is not easy if you have to invent and write it all alone. If more and more GPU calculations are natively supported by the SDK (Software Development Kit) development gets easier. But the X1 will get another huge boost by integrating eDRAM into the SDK. eDRAM is what makes the X1 more expensive than the PS4 in terms of production costs, despite being the weaker system.
eDRAM might enable the X1 to show some special effects unavailable on PS4, but PS4 will remain the more powerful system, especially on multiplattform titles.
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