Theres really no strange magic on why the 390x can match the R9 Fury. What we are seeing are games that aren't shader limited at that resolution. AMD made a bigger core to pack in a shit ton more texture power and SP power but didn't expand on their ROP engine at all and guess where we are mostly limited? ROP's have been gaming's biggest bottle neck since forever, it really isn't astounding to see that the R9 Fury can be matched by hardware with a similar engine... also the obvious bottle neck by having 4gb of memory only.
Nvidia took a chance (ok not really...) by lowering their SP's to fit more ROP's. Having a smaller number of SP's also happens to be easier to optimize for.
Nvidia took a chance (ok not really...) by lowering their SP's to fit more ROP's. Having a smaller number of SP's also happens to be easier to optimize for.