what they show on zcash forums and on videos as 8x nvidia gpu is very identical to what looks like a stripped down ethminer made by some Chinese company by the name PANGOLINMINER, the whole thing looks fake to me too.. I too wouldn't trust this news without something official from nvidia or amd.
It looks more like a NVidia variation on the Pandaminer - using mobile versions of the cards, possibly modified a bit, like the Pandaminer uses mobile RX series cards.