"the fastest and most efficient GPU we've ever built."
Aside from being a monster card, nVidia has also made it a point to also have a quiet, efficient card as well, without noisy, power consuming fans.
Another feature is something nVidia calls "GPU Boost", which actually boosts clock speed when playing certain games, like Battlefield 3. Another feature shown off is one Desai describes as "TXAA", which automatically removes jaggies without any sort of performance hit. The updated PhysX engine is also highlighted, with dynamic fracturing and advanced fur physics shown off.
According to official specs, the NVIDIA GeForce GTX 680 offers 2048MB GDDR5 video memory and supports DirectX 11. Gamers can also take advantage of the dual SLI or 3-way SLI. Additionally, the card also features 2 DVI, 2 mini-display ports, and 1 HDMI output, allowing for up to four monitors to be connected at once.
Check out the presentation showing off the card's capabilities in the video below.