ASUS's GPU Tweak overclocking utility does a fine job of tweaking and monitoring parameters, with facilities for saving profiles, screen/video capture and update notification for new bios and driver releases.
Due to Nvidia's controversial Green Light Program, AIBs are forbidden (if they want to provide a warranty) to manufacture Kepler based cards with any capability to raise voltages above the official 1.175V limit, thus rendering any meaningful overclocking moot. Furthermore, the TDP power cap is limited to only +10% (127W), which greatly neuters the GPU boost clock frequency headroom.
|Reference GTX 660||ASUS GTX 660 DirectCU II TOP||ASUS GTX 660 DirectCU II TOP with OC|
|Base Clock||980 MHz||1072 MHz (+9.4%)||1137 MHz (+6%)|
|Boost Clock||1033 MHz||1137 MHz (+10%)||1202 MHz (+5.7%)|
|Memory Clock||1502 MHz||1527 MHz (+1.6%)||1677 MHz (+9.8%)|
Overall, the cooler was effective and quiet, which is not a surprise given the relatively small heat output of the GTX 660.