It looks like other companies are following suit after EVGA announced 6GB GTX 780 variants. Palit has just announced that they are also working on a 6GB GeForce GTX 780 graphics card. The card is the GeForce GTX 780 JeStream 6GB.
The card will feature factory-overclocked speeds of up to 902 MHz (core), while the memory will remain untouched at 6.0 GHz (effective). The 6GB variant of the card looks like it will feature the same board design as the 3GB card and will have a large triple-fan cooler.
Palit did not reveal the exact launch date or pricing details.