GeForce GTX 660 Gigabyte OC 3GB Edition a special edition of GeForce GTX 660.
The new features include the WINDFORCE 2X 100mm Fansink equipped with "Triangle Cool" Technology solution which is more effective than the standard/reference cooler.
In terms of overclocking, the base-clock was increased from 980MHz to 1033MHz and the boost clock can now reach 1098MHz, instead of 1033MHz. The memory clock was left untouched.
Furthermore, the frame buffer was increased to 3GB though this will not boost its performance and can be addressed as a gimmick - marketing to lure consumers into paying more for the same product.
The overclocking is therefore significant and the performance boost is around 6% when compared to the standard GeForce GTX 660.