A block diagram on AMD Tonga R9 285 has appeared on the web, and it shows that the GPU carries 2048 Stream Processors. Tonga will end up as the GPU used in the AMD Radeon R9 285, however already is used in yesterday's release FirePro cards.
The GPU has 2048 GCN stream processors running over 32 compute units. The chip would have 128 texture memory units
The block diagram originates from a FirePro W7100 professional graphics card presentation which is based on "Tonga." The W7100 uses 28 of the 32 available CUs and as such you can easily recalculate the true number of shader processors. Tonga will be tied to a 256-bit wide GDDR5 memory interface
The initial consumer graphics card based on Tonga will be the Radeon R9 285 which is expect to have 1792 activated stream processors making it perform at GeForce GTX 760 and Radeon HD 7950 level performance but with better thermals and lower power consumption.
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AMD Tonga has been rumored ever since this time last year in 2013, however rumors now indicate that the long awaited part is to be released at 28nm to take on the battle with NVIDIA's GM107. GM107 ...
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