AMD “Tonga” Radeon R9 285X and R9 285’s specifications leaked

AMD’s upcoming “Tonga” GPUs are nearing their launch and more leaks are coming through. Earlier, we reported on the custom variants of Radeon R9 285 with alleged specifications but a recent leak gives a more realistic view of the specs. Fudzilla reports that R9 285 based on Tonga Pro will arrive in the coming weeks while Radeon R9 285X based on Tonga XT will debut in September. Both GPUs will be faster than their predecessors and priced relatively lower as well.

Radeon R9 285X _1

Radeon R9 285 “Tonga Pro”; 1792 Shaders and 150 W TDP

AMD’s “Tonga” GPUs are shaping up to be quite a deal if the reported specifications are true. Radeon R9 285 based on “Tonga Pro” will feature 1792 shaders and 2 GB GDDR 5 memory spread across a 256-bit memory interface. The GPU core will be clocked at 918 MHz while the memory will be clocked at 1375 MHz or 5.5 GHz effectively. Radeon R9 285 is going to be a direct replacement to the current Radeon R9 280 which has similar specifications but a higher TDP and memory size. The “Tonga Pro” based card is said to come with a 150 W TDP and lower power consumption compared to its Tahiti counter part.


We have already seen glimpses of the custom variants of R9 285 courtesy VideoCardz. We can expect factory overclock speeds on the custom variants with the help of custom cooling solutions (varies by AIB partners). Last generation GPUs were known for their high temperatures so it will be interesting to see how AMD has tackled this problem in “Tonga Pro”.

Radeon R9 285X “Tonga XT”; 2048 shaders and 384-bit memory interface

“Tonga Pro” also has an elder sibling “Tonga XT” which is scheduled to launch in mid September. Radeon R9 285X will feature 2048 shaders and 3 GB GDDR5 memory spread across a 384-bit memory interface. Fudzilla did not reveal any clock speeds of R9 285X because its still in development. However they did mention that some AIB partners already have samples and working on optimal clock speeds and thermal designs.

Radeon R9 285X will replace Radeon R9 280X based on “Tahiti XT” GPU. The new GPU is expected to perform better than R9 280X as well as NVIDIA’s GeForce GTX 770 while drawing less power. We can expect its TDP to be around 200 W and it is expected that it will have a better performance per watt ratio compared to both its predecessor and rival.

Radeon R9 280Radeon R9 285Radeon R9 280XRadeon R9 285X
GPUTahiti ProTonga ProTahiti XTTonga XT
Process28 nm28 nm28 nm28 nm
Memory Interface384-bit256-bit384-bit384-bit
GPU Clock933 MHz918 MHz1000 MHzN/A
Memory Clock1250 MHz1375 MHz1500 MHzN/A
TDP200 W150 W250 W200 W

There is no information available on the pricing of Radeon R9 285X but we assume that it will fall some where between $300-350 price point. Obviously none of the information above is officially confirmed at this point so we advise to take this with a pinch of salt.


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