Take these results with a massive bag of salt, remember the BETA Crysis 3 benchmarks ? they were completely different from the final game build on both CPU & GPU performance.
Generally speaking performance optimization & polish takes place during the beta phase, where no new features are being implemented into the game (post-alpha).
And it is obvious that no AMD CPU optimizations have been made yet, this is what an AMD CPU optimized chart looks like (Crysis 3)
Very high core utilization.
No hyper-threading support.
So clearly the AMD/Frostbite CPU & GPU optimization process that EA & AMD have announced is still in effect & hasn't been implemented into the alpha yet.
So expect the final build of the game to have significantly different performance results.
I would presume that the current benchmark results are based on the same optimizations made with BF3 & just carried over without any of the BF4-specific optimizations added in yet.