In my opinion, Nvidia Inspector is the best overclocking tool. The reasoning for this is because Nvidia Inspector lets you change the voltage with any card. My graphics card is the GT 730. This overclocking utility lets me overclock with ease, and gives me a lot of information about the resources and the information about the driver and the card. It is like CPU-z or GPU-z but it is more functional, as it lets you overclock. So my overclock on the gt 730 is 250 MHZ on the core and 300 MHZ on the memory. The voltage is at max, otherwise, it would be very unstable and would crash. Nvidia Inspector is just more functional than MSI Afterburner, Precision X, and Palit Thundermaster as it lets you overclock the main parts, and it lets you tweak the voltage. Did I also mention that the fans also are faster? No, I didn't I don't even know why I even asked such a rhetorical question. In conclusion, I believe that the best overclocking utility is the Nvidia Inspector.