ZOTAC GTX 680 Extreme Edition Clocked at 1.20 GHz@ 2012/04/03
Apart from a strong VRM (detailed in the older article), the card is also backed by several nifty features, such voltage measurement points, extreme-cooling optimized BIOS, and adequate-looking VRM cooling. The USB mini type-B connector on the back of the card turns out to be not a connection to an OC module, but a USB connection to the motherboard. ZOTAC is routing the card's SMBUS to its Firestorm OC software over USB. Maybe they haven't figured out [how] this could be done through the NVIDIA driver interface, or they didn't trust NVIDIA. For example, NVIDIA blocks SMBUS access to components that they deem "sensitive".