RV670

4 SIMD cores * 16 modules * 5 Alus (4+1) = 320 sp
4 TMU per SIMD unit = 16 TMUs

RV770

10 SIMD cores * 16 modules * 5 Alus (4+1) = 800 sp
4 TMU per SIMD unit = 40 TMUs

RV775 ???

12 SIMD cores * 14 modules * 5 Alus (4+1) = 840 sp
4 TMU per SIMD unit = 48 TMUs

or

6 SIMD cores * 28 modules * 5 five Alus (4+1) = 840 sp
8 TMU per SIMD unit = 48 TMUs

I think is fake cause the 512MB doesn´t look good but the math is doable. I don´t know much about GPU´s and their internal structures and how they work but maybe if RV775 is true is just a rearrengement of this structures too make it easier to program and to make it more efficient.