It is an impressive chip as shown by benchmarks BUT they didn't show power consumption and heat. I believe they would need to lower those clocks to get heat and power utilization in acceptable levels and would cause the benchmarks to drop. Intel's R&D did a great job in these departments and that is why I'm sticking my guns with intel.
Indeed it can be taken with the same pinch of salt that those unconstrained Tegra 4 reference tablet benchmarks can be taken although I suspect it should throttle less than A15 does. However I think you will only be allowed to get either max cpu or max gpu performance out of it but not both at the same time. Silvermont should beat it on cpu but gpu will be tougher and it may lose more than it wins in that dept but we shall soon see.