http://wccftech.com/amd-launches-fi...00-firepro-w5100-firepro-w4100-firepro-w2100/
"Not a Tahiti rework", they said.
The AMD FirePro W7100 Tonga GPU based graphics card features 1792 stream processors configured in 28 compute units. Based on the GCN 1.1 die, the Tonga GPU has 32 Compute Units in total but we are looking at a toned down version which has four CUs disabled resulting in the 1792 SPs variant. The FirePro W7100 like I said has 4 triangles per clock cycle, 32 ROPs, L2 cache of 512/1024 KB and a 256-bit memory controller. The W7100 features a 8 GB GDDR5 memory running across a 256-bit bus pumping out a cumulative bandwidth of 160 GB/s and has 12 times the encode performance of W7000 while display outputs include the ability to drive four 4K monitors with Display Port 1.2. The Tonga GPU was always meant to be highly efficient and AMD has toned down its TDP to sub-150W so we can say a TDP of 150W is what’s to expect from the consumer Radeon R9 285 variant which goes on sale this month.
The 7950 and 280's TDP is 200 Watts, TDP is not power consumption, however the 7950 and 280 do use 200 Watts.
So Tonga would be pushing about a 25% efficiency improvement.