Zalman has given the S5 a side panel made of tempered glass. The interior of the housing is completely black and, due to the contrast, contributes to the elegant overall picture of the S5. The case features a power supply shroud for power supplies up to 190mm in length and a modular drive cage for two 3.5″ or 2.5″ Hard Drive/Solid State Drives. Four additional 2.5″ drives can be mounted on the back of the motherboard tray and on the power supply shroud. The minimalist front offers subtle perforation and RGB lighting, Two pre-installed 120mm fans, an RGB fan in the rear of the chassis and a non-RGB fan in the front ensure good ventilation. The front of the Zalman S5 can hold a total of up to three 120mm fans, while there is space for up to two 120mm fans in the bottom and top of the chassis for additional cooling potential. Processor coolers must not exceed a height of 163mm, while graphics cards can be up to 340mm long. As a special feature, the Zalman S5 also offers options for installing water cooling; a vertical radiator bracket can accommodate two 120mm fans and one 240mm radiator. Another 240 mm radiator can be placed in the cover of the housing. The foldable cable duct on the back of the motherboard tray ensures tidy cable management throughout.