I am guessing it's a typo or something too. I know that the 'partners' of nVidia e.g. Zotac, Asus, Gigabyte, Palit, etc. do things to these cards which alter the original spec (although not normally a fundamental core spec). I just wondered if this was the case as I ordered the 650 ti because it was double the cudas (for vid editing) of the original card I had specified (the 1gb GTX650). That only had 384.
The Nvidia Kepler chipset cards are based on blocks of 192 cores per Symmetric Multiprocessing Unit (or SMX as they call them now). So the 650ti has 4 SMX's, the 650 has 2, the 670 has 7 and so on.
No matter what the various 'partners' do they aren't going to be able to tweak the number of CUDA cores. Clock speeds and cooling styles are where you get the variety.