Although the first Radeon R9 380X graphics cards began appearing in the press way back as mid-September,but according to TechPowerUp it's only in mid-November, the 15th to be precise, that AMD plans to formally launch this new performance-segment SKU. Priced at US $249, the R9 380X will be positioned between the $300+ R9 390/GTX 970; and the $200-ish R9 380, capitalizing on a gaping hole in NVIDIA's product stack, between the GTX 960 and the GTX 970.
The R9 380X will be based on the same exact silicon as the R9 380, and the same exact compact package, with pins for 256-bit wide GDDR5 memory interface; and not the 384-bit interface that the "Tonga" aka "Antigua" silicon physically supports. All 32 Graphics CoreNext compute units (CUs) will be enabled, yielding 2,048 stream processors. The chip will also feature 128 TMUs and 32 ROPs. The core could be clocked as high as 1100 MHz, and memory at 6.00 GHz (GDDR5-effective). 4 GB will be the standard memory amount. There won't be a reference design, and AMD AIB partners will be ready with custom-design products from day-one.