I've been looking at power supplies for a new computer, and I came across the Antec TrueControl 550w. It had a control panel that fits into a 5.25" bay that allows you to alter PSU fan speed and 3.3v, 5v, and 12v voltage output. Since this is my first time overclocking, that brought me to another question: How do you normally adjust the voltage from the PSU? Do you have to open the case and change something on the PSU or motherboard? Or can you just do something in the BIOS? Also, while I was searching for the answer to this question in this forum, I noticed a lot of topics talking about VDD modding. What is VDD? Thanks a lot.