Tahiti still rules. Power efficiency? NO. Compute efficiency? YES 
Old news and it's been this way for a long time. Newer gen cards are producing similiar hash rates and using considerably less power.
Exactly. Still, looking at those figures I feel Ellesmere should be doing something like 250-260 h/s at 1050 MHz. Or there is some Open CL catch that is holding compute performance at lower levels? All this masqueraded by higher GPU and MEM clocks .......