Cooling Fan: Front: 120mm fan x2 (one white LED XtraFlo installed, one optional), or 140mm fan x1 (optional) Rear: 120mm fan XtraFlo fan (no LED) x 1 (installed)
Optional Cooling Fan: Left Side: 2x120mm fan or 180/200mm fan x 1(optional), Right Side: 1x120mm (optional), Top: 120/140mm fan x2 (optional), Bottom: 1x120mm (optional), HDD Cage: 1x120mm (optional)
I/O: USB3.0 x 2, USB2.0 x 2, Audio In & Out (supports AC97/HD Audio)