That's not efficiency. That's desperation to narrow the gap, and as some have said, Sony had to cough up extra dough to even cool it correctly which may bite them in the ass later on. Time will tell.
W/ obvious voltage, heat & wattage increase coming w/ clocking so high, it's one of the least efficient consoles to date. Not to mention, the binning process involved w/ less CU's. Similar to GPU's/CPUs of past, higher core count/cuda/CU count @ lower speeds (for same target performance)= less heat/power when compared to the opposite due to the binning process AMD/INTEL/NVIDIA has always used (less voltage for same performance, saved for the higher end cards/cpu's). Again, if we're talking apples to apples, 10tf to 10tf.