Exact specifications are still a mystery but it's believed the card will have the full Tonga with 2048 stream processors, 32 compute units, 128 TMUs, 32 ROPs and perhaps a 384-bit memory bus with 3GB or 6GB of GDDR5 memory.
Another equally plausible theory pins the R9 380X as a chip with 2,048 stream processors, but the same 256-bit GDDR5 memory interface of the R9 380, with 4 GB of memory, letting AMD keep the costs low. XFX appears to be ready with a "Double Dissipation" card based on the R9 380X. The card's new-generation Double Dissipation cooler features an aluminium fin-stack heatsink with four 8 mm thick nickel-plated copper heat pipes, and a pair of 100 mm spinners, which are easily detachable, letting you clean the heatsink underneath. Mass-production of the R9 380X is reportedly underway, so a launch is to be expected rather soon.Here's a photo of the XFX R9 380X with Double Dissipation cooler:
Via: TPU