Hardware.Info posted AMD Radeon R7/R9 300-series review: R7 370 2 and 4GB, R9 380 2 and 4GB and R9 390 and 390X benchmarked A quote from the article:

AMD introduced her new R7/R9 300 range of graphics cards on the 18th of June. We benchmarked the Radeon R7 370 2GB and 4GB, 380 2GB and 4GB as well as the Radeon R9 390 and 390X.

We will not dive in to technical aspects and possibilities of the new card, as we have done this before in separate reviews and comparison tests. The cards used in this review are unfortunately not the reference models as we did not have these available, instead we have used cards supplied by third party partners that we clocked back to reference values.

ASUS and MSI supplied us with a R7 370 2GB, R7 370 4GB, R9 380 2GB and 4GB and the R9 390X. Sapphire was the first manufacturer that could send us a vanilla Radeon R9 390. We will not go into the exact specifications of the third party cards but focus on the actual performance of the different models.

 AMD Radeon R7/R9 300-series review: R7 370 2 and 4GB, R9 380 2 and 4GB and R9 390 and 390X benchmarked @ Hardware.Info