that's actually not bad for the GTX 780.
the 780 and Titan I feel get lower scores because of the chip being laser cut while the 770's being a full non cut chip score better.
comes down to binned chips.
Edited by malmental - 6/20/13 at 6:36pm
It represents the arbitrary number Nvidia or ATI assign a die based on its location and performance figure they are trying to target. Just like it was said before a lower number should have higher leakage, but may also mean a closer to the edge die cut. If everything else were equal a number such as 85% should yield a balance between leakage so you can throw more voltage at it and non faulty transistors from die defects.