Lots of rumors were spreaded out since first leaks surfaced. But since the card is finding new owners as we speak, we have more detailed information now. Owner of GTX 680 has explained on Overclock.net forums why GPU-Z shows different clocks.
There are three profiles of core clock for GeForce GTX 680. First is the “idle clock” set at 706 MHz. Full load upscales it to 1006 MHz, but there is also third clock – Turbo Boost, which can be set as default full load clock through NVIDIA Control Panel.
Memory clock is set to 1502 MHz, which is 6 GHz effectively. Shaders are clocked twice as fast as core clock. Review which was posted by HKEPC suggests this card can be easily overclocked to 1150 MHz for core and 1800 MHz for memory.
This is how clocks settings look:
|Specifications||GeForce GTX 680|
|GPU||28nm Kepler GK104|
|Die Size||294 mm²|
|Core Clock||Idle Clock: 706 MHz|
Full Load Clock: 1006 MHz
TurboBoost Clock: 1058 MHz
|Shaders Clock||1411/2021/2116 MHz|
|Memory Clock||1502 MHz (6 GHz effective)|
|Memory Type||2GB GDDR5|
|Memory Bandwidth||192.3 GB/s|
|Raster Operating Units||32|
|Power Connectors||2 x 6-pin|
- READ MORE (Source): Overclock.net Forums