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be quiet! DARK BASE 900 ATX Full Tower Computer Chassis - Black/Silver
- Versatile due to modular design
- Three be quiet! SilentWings 3 PWM 140mm fans
- Ready for water cooling radiators up to 420mm (top & front)
- Up to 7 HDDs or 15 SSDs
- Up to 11 cooling fans
The be quiet! Dark Base 900 PC case is the perfect choice for all of those who expect the highest standards when it comes to modularity, compatibility and design. be quiet! Dark Base 900 offers unrivaled flexibility with impeccable cooling and silence features. Simply an engineering work of art!

- Fully versatile thanks to modular construction, offering an relocatable motherboard tray, repositionable HDD slots, support for even E-ATX and XL-ATX as well as the possibility of an inverse layout
- Three pre-installed SilentWings® 3 140mm PWM fans featuring a smooth-running 6-pole motor, fluid-dynamic bearing and funnel-shaped air inlets
- Manual stepless fan controller supports up to three PWM and three 3-pin fans
- Effective full circuit airflow system with innovative noise-reducing vents all around the case
- Completely sound insulated case with decoupled elements for motherboard tray, power supply and drives
- Four areas for water cooling radiators up to 420mm on top, front, back and base of the case
- 2-in-1 side panel vent can be closed for silent operation or opened for two additional fans
- Product conception, design and quality control in Germany

The motherboard tray can be repositioned vertically, to suit individual space requirements, or installed alongside the left panel with redefined airflow. It is removable for use as a bench table.

The three pre-installed virtually inaudible SilentWings® 3 PWM fans with unique fan blade design, rubberized fan frame and funnel-shaped air inlets provide excellent air circulation.

Adjustable side panel cover that you can close for absolute silence, partly open for more air intake, or completely open with the possibility to mount up to two optional fans.

Manual stepless fan controller supports up to three PWM and three 3-pin fans. 2x USB 3.0, 2x USB 2.0, HD audio jacks.

Flexible installation options thanks to repositionable single HDD slots. Support for up to 7 HDDs, 15 SSDs and 2 optical drives.

Innovative noisereducing vents all around the case result in an effective full circuit airflow.







Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 1 year
- Limited Warranty period (labor): 1 year
- Read full details
Return Policies
- Return for refund within: 30 days
- Return for replacement within: 90 days
- This item is covered by be quiet! Return Policy
Pros: Let me first say, this case is truly awesome. Not only is it among the best cases available (at any price), but it is also easily the best case I've built a computer in (and I've been building computers for decades). I purposely bought this rather than the pro version, because I don't like windows in my cases - the window on the Pro version is located where you couldn't see it anyway, and not having a window means additional soundproofing for even less noise. And speaking of noise, this is easily the quiestest case I've ever used. Primary heat generators inside the case include a water cooled Intel Core i5-6600, an EVGA GTX 1080 FTW Gaming ACX 3.0 (a very powerful factory overclocked card, which fit *with* the drive cages and other stuff in place, BTW), and 3 mechanical drives. Even when stressing these components, such as when gaming at 4k, the sound is hardly noticeable and temps are not even a concern. Build quality and attention to detail is spectacular. The brushed aluminum finish looks great. It has been hit by my chair many times, and still shows no scratches. Screws and other hardware are good quality and painted black to blend in - a very nice touch. It is well assembled and feels stout. The pieces fit together well, with uniform gaps in the seams. The metal is well formed - smooth, with no sharp edges - with a premium feel. They even provide painted screws so that there is nothing distracting from the aesthetic. Seriously, who does that anymore?!? :) The case is obviously well thought out, with features & options galore - you'd be hard pressed to want more. It supports multiple radiators, and you can even change the positioning of the motherboard to accommodate a thick radiator up top. It has space for numerous hard drives (both 3.5" and 2.5") and fans, and includes intake filters that are both easy to access and clean. It has many holes for cable routing and plenty of space behind the motherboard for wires. And these are just the highlights! Bottom line: I love this case and heartily recommend it. For what it's worth, I also bought a be quiet! power supply and additional fans. They are just as great.
Cons: For me, there aren't any cons. Others might have concerns about the size (it's on the larger side) or price. And, the drive cages are not completely tool-less, but as mentioned in the "Pros" above, be quite! even supplies black screws for the hard drives to maintain the nice aesthetic.
Overall Review: Seriously awesome case. I know it's not cheap, but I can't imagine you will be disappointing. I am now a huge fan of be quiet! The case, power supply, and fans are all excellent products in their categories. They are obviously well designed and thought out, and built to a high degree of quality.