when looking at the cm 690, it's easy to be taken in by its bold lines and superb styling. but don’t let its exterior fool you – the cm 690 is a lot more than just a pretty face.by utilizing a unique mesh design, the cm 690 effectively blends together both form and function, offering users a mid-tower chassis without compromise. features: 1. accommodates up to seven 120 mm fans for high-efficiency ventilation 2. removable hdd racks provide for easy assembly 3. cable management design for better cable routing and neatness 4. tool-free user-friendliness for quick maintenance and upgrade 5. roomy interior supports nvidia g80 sli configuration