Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
Sometimes you are able to shade in a resistor of a voltage controller circuit to reduce the resistance across it...this will result in a higher GPU voltage.
How you do it depends on the card you have. It should never be done without use of a DMM.
Basically it's physically modding your graphics card to make it quicker.
We used to have to overclock CPUs this way, before manufacturers started writing decent bios'.