jenealogy :
Thanks. When you say "run at full speed" - is that a problem? My box came with 4 fans - 2 in front and 2 on top. The front is where the hard drives are. What would you recommend in terms of plugging which fans in? Thanks.
Well full speed just means the fan runs at it's highest rated specification, so if it's a Noctua NF-P12, it'll run at it's highest speed, i.e 1300 RPM.
For you with four fans, you have to look at the headers on the board:
CHA_FAN2 - Left side of board (or rear)
CHA_FAN1 - Right, upper side of board (or front)
CHA_FAN3 - Right, lower side of board (or front)
PWR_FAN - Right, upper side of board (or front)
You're only option is to use the PWR_FAN connector seeing as you have four fans, unless you want to plug one or more of them into a fan controller which is exposed to the outside of your case.
I would think two of your front fans use CHA_FAN1 and CHA_FAN3, then the top two fans use CHA_FAN2 (on the left side looking at the board installed) and the other uses PWR_FAN which is on the right of the board.
Of course you could not install one of your fans, are two top fans really needed? You could just use one then you wouldn't have to use PWR_FAN.
Just some ideas for you.