EVGA and Palit are proud to introduce the first GTX 780s with double the standard memory amount, which should help users push increasingly high resolutions and textures.
The Palit model will be available with their JetStream cooler (shown above) and EVGA will be offering their cards with Nvidia's Stock cooler and their ACX coolers.
EVGA will also be making their 6GB ACX model available through their Step-Up program, allowing those who recently purchased one of their GPUs (within 90 days) will be able to upgrade to this model paying only the price difference.
While a 6GB frame buffer sounds fantastic, I doubt many will be able to make full use of it but an upgrade is still an upgrade here.
Hopefully a 6GB model of the 780Ti will soon follow here, given how raw power is also required for high res gaming and not just VRAM. Nvidia may have blocked this in order to sell more Titan Black cards, but this is unconfirmed.
The release date has not be confirmed at present, but EVGA say that their 6GB models will be available for a MSRP of $549.99.
Source - techpowerup