AMD has now officially announced its newest AMD Radeon R9 285 graphics card based on the Tonga Pro GPU with 1792 Stream Processors. The new R9 285 will replace the old, Tahiti Pro based R9 280 graphics card and compete directly with Nvidia's GTX 760 graphics card once it launches on September 2nd with a $249 price tag.

As detailed earlier from various rumors, the new Radeon R9 285 is based on AMD's newest and more power-efficient 28nm Tonga Pro GPU. The GPU packs 1792 Stream Processors, 112 TMUs, 32 ROPs and a 256-bit memory interface which will be paired up with either 2 or 4GB of GDDR5 memory. The reference clocks for the AMD R9 285 are set at 918MHz for the GPU and 1375MHz (5.5GHz effective) for the memory.