Tahiti still rules. Power efficiency? NO. Compute efficiency? YES

I unified GPU clocks and MEM bandwidth - both cards with core@1050 and bandwidth 256 GB/s

Sapphire 7950 Elpida, 28 CU, 1792 shaders - 200 h/s, 150W at wall
Sapphire 480 Samsung, 36 CU, 2304 shaders - 195 h/s, 95W at wall

Shame on you, Ellesmere.
Now I want to solder Samsung chips on my Tahiti cards