4 Pin is overkill, mainly it's for a CPU fan, rest can be monitored and volt controlled, there are excelent control panels that do just that, Zalman ZN-MFC2 or Scythe KM02-BK are examples, there are many more.
I prefer stand alone solutions, because they will beep and warn me if fan failed or underperforming.
My ROG: MOBO: ASUS Crosshair V Formula | CPU: AMD 1100T Black Edition (O/C 4.125 GHz) | RAM: G.Skill Ripjaws 1600 4x4 GB (PC12800 842 MHz) | PSU: Rosewill 1000W 80+ Bronse
GPU: 2xEVGA GTX 560Ti 2GB VRAM | Primary HDD: Samsung 470S 128 GB SSD | Secondary HDD's: 3x WD Caviar Green 2TB Non Raid | ODD: Samsung BD-R/DVD-RW
Cooling: CPU: Corsair H5O with Push Pull Scythe Slipstream fans | Rest: GELID Ultra quiet closed loop fans. | Control: Zalman ZM-MFC2