I'm not convinced it is ten time faster than Xenos, on "raw theoretical throughput" it is in real term I would think no, I remember reading an interesting take on older Xenos and how it could hanlde a lot of calculations "for free", or more accurately operations that require quite a few operations on newer AMD architectures.In terms of what the GPU can do, PS4 is likely to be rather more than ten times faster. I'm not even sure how you'd try and measure PS3 GPU compute ....
Indeed with regard to process shifts we've moved from Moore's Law to more slow>>>>I suppose 20x for next gen is technically possible, even if we know it ain't going to happen. Unless we're talking about the WiiU.