Very simple, very easy to use. No rebooting needed to change the numbers. (only reboot required is after install)

Gives visible (mostly positive) effect with most games and apps when giving 10% boost to the v-card. It works nice.

But I wouldn't suggest giving much more than max 10%, as higher numbers may damage the graphic card permanently - especially if you don't provide extra cooling.

For laptop-users: You can use this tool to lower energy-consume of the graphic card by lowering the graphic CPU-speed. While in other hand, you can expect extra power-consume when you increase the speed.