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Corsair Obsidian Series 900D Super Tower Case



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Corsair Obsidian Series 900D Super Tower Case


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.

The Obsidian Series 900D Super Tower PC case is the platform of choice for your next ultimate dream PC. Whether you're integrating state-of-the-art liquid or air cooling, building a quad-GPU, dual-CPU graphics powerhouse, creating a monster file server, or even all of the above in one incredible system, 900D makes it happen.

It's not just big - Obsidian Series 900D has been carefully engineered for fast builds, easy upgrades and flexible expansion. The aluminum frame and solid steel panels give 900D the rigidity and strength you need for multiple teardowns and rebuilds, and the brushed aluminum fascia completes the look of understated overkill.

  • Includes three 120mm AF120L and one 140mm AF140L exhaust fan
  • Brushed aluminum front fascia with full cast aluminum surround structure front and rear
  • Five radiator mounting points: Front: up to 360mm, Top: up to 480mm (4 x 120) or 420mm (3 x 140), Bottom side one: up to 480mm (4 x 120) or 420mm (3 x 140), Bottom side two (with PSU installed): up to 280mm (2 x 140) or 240mm (2 x 120), Rear: 140mm or 120mm
  • Up to fifteen total fan mount locations
  • Nine tool free 3.5" and screw-in 2.5" combo hard drive bays for maximum storage, upgradable to fifteen total (requires purchasing two additional cages)
  • Four tool-free 5.25" drive bays
  • Dual USB 3.0, quad USB 2.0 front panel I/O
  • Tool free side panel access to top panels.
  • Magnetic latch bottom HDD/Radiator chamber access with swing-out doors.
  • Full side panel window
  • Removable lower rad covers allow you to customize between cooling and clean, refined appearance
  • Three hot-swap bays integrated into one of three included modular hard drive cages.
  • Ten expansion slots for multi-GPU dream systems
  • Dual PSU bays
  • CPU backplate cutout and rubber grommeted cable routing holes
  • Easily removable dust filters and fan covers.
  • Snap-down cable routing latches and extra routing space behind the motherboard tray.
  • ATX, Micro ATX, E-ATX, HPTX, and Mini ITX compatible
  • PSU - ATX (not included)



Product Description
Corsair Obsidian Series 900D - full tower - extended ATX
Form Factor
Full tower
I/O Connectors
4 x USB 2.0 , 2 x USB 3.0
Supported Motherboards
ATX, microATX, Mini-ITX, Extended ATX, HPTX
System Cabinet Features
Windowed side panel, removable dust filter, water cooling holes
Power Device
No power supply
Specification Compliance
Dimensions (WxDxH)
25.2 cm x 69.16 cm x 64.96 cm
18.6 kg
Manufacturer Warranty
2 years warranty



Form Factor
Full tower
Max Mainboard Size
Extended ATX
Supported Motherboards
ATX, microATX, Mini-ITX, Extended ATX, HPTX
Specification Compliance
Internal Bays Qty
Front Accessible Bays Qty
Hot-Swap Bays Qty
Cooling System
120 mm fan x 3 / exhaust , 140 mm fan x 1 / exhaust , Fan mount x 11
System Cabinet Features
Windowed side panel, removable dust filter, water cooling holes

Expansion / Connectivity

Expansion Bays
4 (total) / 4 (free) x front accessible - 5.25" , 3 (total) / 3 (free) x hot-swap - 3.5" , 6 (total) / 6 (free) x internal - 3.5"
Expansion Slots
10 x Expansion Slot
4 x USB 2.0 , 2 x USB 3.0


Power Device
No power supply
Max Supported Qty

Dimensions & Weight

25.2 cm
69.16 cm
64.96 cm
18.6 kg

Manufacturer Warranty

Service & Support
2 years warranty
Service & Support Details
Limited warranty - 2 years

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