The Corsair Obsidian 550D conforms to the ATX form factor and so can accommodate motherboards with form factors ATX, Micro-ATX and Mini-ITX.
It is made of Steel and its dimensions (LxWxH) are 495mm x 220mm x 530mm.
|Form Factor||ATX||Front Fans Size||120mm|
|Motherboard Form Factors||Top Fans||2|
|Material||Steel||Top Fans Size||120mm|
|Expansion Slots||8||Side Fans Size||140mm|
|5.25″ Drive Bays||4||Rear Fans||1|
|3.5″ Drive Bays||6||Rear Fans Size||120mm|
|2.5" Drive Bays||6||IO Display Panel||yes|
|Tool-less Rails||yes||Front USB 2.0 Slots||0|
|Length||495mm||Front USB 3.0 Slots||2|
The Corsair Obsidian 550D 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 495mm x 220mm x 530mm.
The Corsair Obsidian 550D has eight 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 four 5.25" drive bays, which is enough to house an optical drive and a couple of hard drives, while still having space for plenty more HDDs with the six 3.5" drive bays that are also available. You can even install an SSD or laptop-sized HDD using one of the six 2.5" drive bays. Installation of hard drives into these drive bays is made all the more easier by screwless rails that allow tool-less mounting.
Made primarily of Steel, the Corsair Obsidian 550D 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.