Rumor site WCCFTech reports AMD's Radeon R9 380X will feature a 256-bit memory bus with 4GB GDDR5 memory. This Antigua XT based card is expected to hit retail shelves in November, it's a faster version of the Radeon R9 285. The model has a GCN 1.2 GPU with 2048 stream processors, 128 TMUs, and 32 ROPs.
The Radeon R9 380X has been anticipated for a long time, the first rumors picked up a year ago when the R9 285 was announced. The Radeon R9 285 was the first graphics card built on the latest GCN 1.2 core and also the first card to make use of the Tonga Pro core. Since the launch of that card, it was expected that AMD will launch the XT variant very soon. That card is yet to come to the desktop market while the Tonga XT chip itself has made it to the market in form of mobility and embedded variants. Even when AMD updated their Radeon 300 series lineup, we once again saw only the Pro variant. Now known as Antigua, the slightly tweak Tonga XT and Pro variants deliver better performance per watt. From the last month, we once again rumors were active that the full Tonga XT (Antigua XT) chip will be coming to the desktop market in the form of the R9 380X card.