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Corsair Obsidian Series 900D Case

Corsair CS_CS_900D

Availability: In stock

Quick Overview

The King of cases.  Corsair had one simple goal in mind when making this chassis.  The best water cooling case in the world.  And to be quite frank it is.  Space for multiple radiators, great cable management, cast space all make this chassis a perfect basis for a top notch liquid cooled system.  There are some specialist manufacturers who perhaps have cases with more space for water cooling, but those cases certainly don't have the polished finish of the 900D.  A word of warning though, if you have a limited space, then beware this case is huge!!!

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The Obsidian Series: Designed by builders, for builders.

Obsidian Series 900D is for serious builders with big projects. Do you want to design your ultimate dream PC? Add state-of-the-art liquid cooling or air cooling? Build a quadruple GPU, dual CPU graphics powerhouse? Or, just create a monster file server?

If these are the kinds of questions you’re asking yourself, you need a 900D.

Serious Expansion Flexibility for Serious Builders

We don’t need to tell you that there’s no such thing as too much room. We’ll just let the numbers speak for themselves:

  • Ten expansion slots
  • Fits up to nine hard drives or SSDs, with three hot-swap mounts
  • Four 5.25” optical drive bays
  • Room for dual power supplies

And if nine hard drives or SSDs aren’t enough, you can expand to 15 drives by adding additional drive cages (available separately).

Incredible Cooling Performance and Potential

A cooling-optimized case design requires three things: good passive ventilation, flexible fan mounting options for good airflow, and the room to add sophisticated active cooling systems. The Obsidian Series 900D starts with a clear airflow path from the intake fans to the case interior, with no drives in the way. But, that’s just the start.

  • Includes three AF120L 120mm front intake fans and one AF140L 140mm rear exhaust fan
  • 15 total fan mount locations
  • Five radiator mounting points
  • Four removable dust filters
Easy to Build With. Easy to Live With.

System builds should be straightforward and easy, without your PC case getting in the way. And, reconfigurations and upgrades should be just as simple. An enjoyable build process with great-looking results is a huge part of the pride of ownership that comes with building high-performance PCs.

The 900D can help make it all happen with tool-free side panel access, hard drive installation, and optical drive installation. Inside, you’ll find a CPU backplate cutout and rubber grommets on the cable routing holes. There’s generous cable routing space behind the motherboard tray, and snap-down cable latches help you create clean, easy-to-modify cabling that doesn’t rely on dozens of zip ties.

You also get modular hard drive cages, and the dust filters and fan covers are easily removable for cleaning and maintenance.

Understated Overkill

Let the beginners use cases that look like they’re going to turn into a giant robot. Obsidian Series 900D is built on a steel and cast aluminum frame, with solid steel panels and a fully painted interior. The brushed aluminum fascia resists scratches and fingerprints, and it’s just plain fun to put your hands on it.



Two years
Case Form Factor
692mm x 252mm x 650mm
Case Motherboard Support
Maximum GPU Length
Maximum CPU Cooler Height
Maximum PSU Length
Case Expansion Slots
Case Drive Bays
(x4) 5.25in
(x9) Combo 3.5in/ 2.5in
Case Material
Brushed Aluminum and Steel
Case Power Supply
ATX (not included)
External Connections
(x4) USB 2.0 
(x2) USB 3.0 
(x1) Headphone Port 
(x1) Microphone Port
Fan Mount Locations
Front: (x3) 120mm 
Top: (x4) 120mm or (x3) 140mm 
Rear: (x1)140mm 
Side: (x8) 120mm or (x6) 140mm
Mid: (x1) 120mm
Fans Included
Front: (x3) 120mm 
Rear: (x1) 140mm
Radiator Mount Locations
Front: up to 360mm 
Top: up to 420/480mm
Rear: 120/140mm 
Side: up to 420/480mm
Compatible Corsair Liquid Coolers
H55, H60, H75, H80i, H90, H100i, H105, H110