Most of the open source video card drivers for recent cards (amd, nvidia) have little, no, or rudimentary power savings. As a result, they crank the GPU at full power full time. The AMD GPU drivers are gaining power management very quickly and are workable for daily use. The NVIDIA drivers are much more difficult and further behind as a result of the NON COOPERATION of NVIDIA in the development of the open source drivers.
BTW paulag: contradicting people who know better than you is an easy way to build resentment. Its a good thing you're FUNNY
For future reference, you can't copy cd boot files onto a usb stick and expect it to boot. Things need to be arranged properly, which a simple copy CAN'T DO, and they ARE arranged properly on the disk.
Also, google is your friend, just plugging "isolinux" into google shouldn't be too much to expect. The first result that comes up would have told you all about it!
.... for the life of me though, I can't think of a single reason why your mainboard would come with a bootable linux CD..