Fractal Design Define R4 Cases, Black Pearl (FD-CA-DEF-R4-BL) OPTIMIZED FOR NOISE REDUCTION Pre-fitted with dense noise absorbing material the R4 also features ModuVen panels which prevent noise from escaping when silence is required but if cooling becomes a priority the ModuVent panels can be removed to expose add air vents for optional fans SUPPORT FOR LIQUID COOLING top fan positions allow slim 240/280mm radiators to be mounted. Select slim radiators can be mounted in the front fan holder (requires the bottom HDD cage to change position) REMOVABLE HDD CAGES Configuration flexibility is enhanced thanks to two hard drive cages (featuring steel drive trays with black silicone mounting grommets) that support a total of 8 3.5"HDD or 2.5"SSD