Thats only for front panel ports.
It depends on your front panel. Mine, I have the AC97 plugged in because I dont know what the other plug does, i think its HD Audio, the other one, but I dont use the front panel sound that much anyway.
You use the HD Audio if you have a front panel ports that supports 5.1 channnel or higher. If not, theres no point to using HD Audio. I can use HD Audio settings in the BIOS and have the AC97 plugged in, I think thats what I have right now, the AC97 is plugged in but in BIOS its HD Audio enabled for the front panel.
But theres no sound difference really. Nothing you would notice. I use the mobo sound anyway, so ye.
Edit: Anyway, Im soo excited, I cant wait. Tomorrow is Thursday and on Friday I will be leaving for college!
Woot woot, grrr I need to start packing! haha, just need to remember to pack my computer and get it ready to set at like 5 PM tomorrow. So i can leave in the morning on friday. Grrr. What should I bring lolz. I have a list on "What to Bring" but grrr, I dont even know. Im sure Ill forget something.