QuoteThe Pascal cards appear to have the GDDDR memory running at 1.2 – 1.3 GHz, so a jump to 7 GHz is more like a giant leap.
No.
7GHz x 2 = 14, which is the same as 14GT/s from the specs. It's just a different way of showing clocks.
Technically, GHz isn't correct, GT, or GigaTransfers is because of the way GDDR chips work.