Rumors are circling the web that AMD's Tonga GPU may arrive as soon as late August or early September. The first card is expected to be based on the Tonga PRO and may be named Radeon R9 285, which suggests there may be a launch of the Tonga XT afterwards.
In case you missed the earlier report, Tonga GPU is pretty much the same GPU as the venerable Tahiti since it packs the same amount of stream processors, but will feature a narrower memory interface so the Radeon R9 285 should pack 1792 Stream Processors and 2GB of GDDR5 memory paired up with a 256-bit memory interface. Of course, AMD AIB partners will most likely launch R9 285 graphics card with 4GB of memory as well. According to previous reports, Tonga GPU based graphics cards should eventually completely replace the Tahiti-based ones.