DisplayPort 1.2

At the time of writing, I'm building my first a PC. I need some help for wiring. What do the abbreviations of HD and Ac '97 mean, Where do I plug the HDD LED wires in? Where do I plug the LED wires in? I'm using a Gigabyte GA-EX58-UD3R motherboard.

I recently just installed a new graphics card a ASUS gtx 660 and my computer has been running much slower then usually. I've tried virus scans, and the drivers are all updated and up to date. My computer does recognized the card, and the power supply temp is running fine and can handle the card...