I'll have to disagree with you and computerbase. If the official slides say 5000, 8000 and 10000 sharders, then the cards have those amount of shaders. Otherwise, Nvidia could be sued for false advertising and lose millions. That's why Intel and AMD always say X-cores/Y-threads on their CPUs, and not just Y-cores, because it's not true and can open the door for lawsuits.
They aren't dumb enough to make that mistake.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.