and so a 2048 hawaii would need to be = mhz
and so a 2048 tonga would need to be = mhz
Unknown, its all just speculation unlike some people i'm not saying anything as fact.
The 285 is 22% faster than the 270X
The 280X is 3% faster than the 285.
The 290 is 30% faster than the 285.
270X 1280 Shaders @ 1050Mhz, 256Bit, 1500Mhz
285: 1796 shaders @ 918Mhz, 256Bit, 1375Mhz
280X: 2048 Shaders @ 1000Mhz, 384Bit, 1500Mhz
290: 2560 Shaders @ 947Mhz, 512Bit, 1250Mhz
Despite having only 85% the shaders @ 8% lower Mhz the 285 has 97% the performance of the 280X
15% + 8% = 24%, 7/10 scaling = about 18%
At this point a 2048 Shader 1000Mhz 256Bit Tonga would be 88% the performance of a 290.
Add +100% Bus width, add + 100% ROP's at 4/10 scaling.
Now at 92% of a 290.
Add 512 Shaders (25%) 7/10 Scaling (18%) + 92% = 110% (290X)
Add 20% Memory Speed 1250 - 1500Mhz @ 3/10 scaling (6%) + 110% = 116% (3% faster than a GTX 970 RE: TPU)
Add +5% GPU (1000 - 1050Mhz) 7/10 Scaling = 3% + 119%
IMO a 290P spec 1050Mhz Tonga would be a bit faster than a GTX 970.