The Define R5 White Window has a the ATX form factor. ATX is the most ubiquitous of case standards, providing the largest array of compatible hardware on the market. Using the ATX standard, the case can house motherboards and power supplies with form factors ATX, Micro-ATX and Mini-ITX. The dimensions of the case itself (LxWxH) are 531mm x 232mm x 462mm.

The Define R5 White Window has seven expansion slots, so there is plenty of room for extra components, which may be a deciding factor when planning on the longevity and build type of a PC system. The case has eight 5.25" drive bays, which is more than enough to house various drives, particularly optical drives. There are no 3.5" drive bays, though, so the large number of 5.25" drive bays is a necessity, particularly since there are also no 2.5" drive bays for an SSD or laptop-sized HDD.

Made primarily of Steel, the Define R5 White Window is built to be strong and well-ventilated. Steel cases are generally fairly cheap and sturdy, but also tend to be quite heavy. Whatever your case's material, it is important to keep a consistent airflow so that heat doesn't build up inside. It is therefore advised that you make use of the available built-in case fans and fan installation sections.