The Gigabyte GeForce GTX 780 OC aka the GV-N780OC-3GD is based on the GK110 GPU. While its clock frequency of 954 MHz (1006 MHz Boost) is higher than the Nvidia reference card, we've seen other GTX 780s recently that are even faster. The card has 3GB GDDR5 video memory running at 1502 MHz.
The WindForce cooler is also present on the GeForce GTX 770 OC, so it has the same design with two heatsinks connected by heatpipes and three fans. The monitor connectors are also identical with two DVI ports, one HDMI and one DisplayPort. The GK110 chip needs more power, so the GTX 780 has two 8-pin PEG connectors.
Gigabyte's GeForce GTX 780 OC costs an average of £ 568 / € 604, which is a very good price for this card.