R4 has 7x PCI expansion slot covers that are powder coated white and with ventilation holes/thumbscrews. Immediately next to these covers is a single, vertically aligned PCI expansion slot cover for installing such devices as a fan controller.



Above this is a 140mm rear exhaust fan (R2 Silent Series – 1000RPM) which helps to take air/heat out of the chassis, the cable for this fan has nylon sleeves. At the top of R4 there are two foam pads that cover the cooling fan placements. Dual 120/140mm cooling fans can be installed at the top and a 240mm water-cooling radiator, just as long as it’s less than 3cm in thickness.



Over on the other side there are 2x 5.25” drive bays for optical drives – this section requires standard screws to secure the device.



Moving down to the HDD storage there are a plethora of options available. Fractal Design have given R4 a HDD cage that is split in two. In total there are eight metal trays for installing 2.5” or 3.5” drives. To allow for increased GPU compatibility the upper cage can be removed by simply removing a thumbscrew and sliding the cage out of the chassis. Additionally both HDD cages can be removed to allow for a 240mm radiator to be fitted.