Legion Hardware posted AMD Radeon R9 Fury X Review
A quote from the article:
Late last month on June 24th AMD finally released its Fury X graphics card, possibly the most hyped product of 2015. The week prior to that we received some refreshed AMD GPU's in the form of the Radeon 300 series. Most notably the R9 390X and R9 390, which were architecturally identical to the previous R9 290X/290 in every conceivable way. The only upgrades made included 8GB of faster memory and an ever so slightly higher core clock...AMD Radeon R9 Fury X Review @ Legion Hardware
The faster memory offered a reasonable performance boost and certainly helped strengthen the performance of AMD's high-end GPU's. The only issue being the price, as the R9 390X currently retails for over $100 more than the R9 290X, and if you are to overclock the 290X you end up with the same performance even in games that use more than 8GB of VRAM.