Not entirely. Both you and Horrux are correct.
Pro cards like the Tesla have a much more rigorous validation procedure which goes far beyond crafting UMD's (User Mode Drivers) and
in-place ongoing test evaluation, so while the GPUs are binned for voltage and usable logic blocks, you'd find that a more fine scaled binning is also being used to test the integrity of the logic blocks that are functional. I don't think the binning of pro GPUs differs a great deal from pro CPUs like Xeon and Opteron in that respect.