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be quiet! Dark Base Pro 900 Review

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be quiet! Dark Base Pro 900 Specifications:

PSU form factor
Motherboard compatibility
Case size excl. stands (L x W x H), (mm)
Installation of motherboards with backplate
Case size incl. stands (L x W x H), (mm)
577 x 243 x 585
Dimensions side panel window (L x W), (mm)
479 x 525
Color option
Weight (kg)
USB 2.0
USB 3.0
USB 3.1 Gen 2 Type C
HD Audio I/O
Expansion slots
Fan mounting locations
Qi charger
Fan @ front
2x be quiet! SilentWings® 3 |140mm / 1,000rpm
Fan @ rear
1x be quiet! SilentWings® 3 |140mm / 1,000rpm
Dimensions (L x W x H), (mm)
Front: 140 x 140 x 25, Rear: 140 x 140 x 25
Fan speed @ 12V (rpm)
Noise level @ 12V
Air flow @ 12V (cfm / m3/h)
59.5 / 101.09
Air pressure @ 12V (mm H2O)
Voltage range (V DC)
5 - 13.2
Input power (W)
Input current (A)
Lifespan (h / 25°C)
Fan controller


be quiet! Dark Base Pro 900 Features:

  • 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
  • Effective full circuit airflow system with innovative noise-reducing vents all around the case
  • Completely sound insulated case with decoupled elements for motherboard, power supply and drives
  • Four areas for water cooling radiators up to 420mm on top, front, back and base of the case
  • Elegant, fully windowed side panel made of tinted and tempered glass
  • Eye-catching LED illumination with five switchable colors that you can freely position in the case
  • Integrated wireless charger for Qi enabled devices such as smart phones
  • Product conception, design and quality control in Germany


Unrivaled Flexibility

  • Motherboard tray with enhanced possibilities to suit individual space requirements
    • Completely relocatable and usable as a test bench
    • Adjustable to three different heights
    • Installation alongside the left panel for an inverted layout
  • Repositionable HDD tray for individual space requirements inside the case
  • E-ATX and XL-ATX support permits installation of practically any motherboard
  • Installation options of up to 7 decoupled HDDs, 15 SSDs and 2 optical drives

Impeccable Cooling and Silence

  • Three virtually inaudible SilentWings® 3 140mm PWM fans offer unrivaled and uncompromising performance with a broad range of amazing features:
    • 6-pole fan motor for very low power consumption and less vibration
    • Fluid-dynamic bearing with copper core enables a super long life span
    • Unique airflow-optimized fan blade design
    • Fan frame with funnel-shaped air inlets produces high air pressure
    • High quality IC motor controller reduces electrical noise
  • Intelligent full circuit airflow system with noise-dampened vents all around the case
  • Advanced PWM hub and manual fan controller supports up to four PWM and four 3-pin fans
  • Installation of up to six additional 140mm fans or up to seven additional 120mm fans possible
  • Ready for water cooling radiators up to 420mm with four mounting slots:
    • Front: 420mm – Top: 420mm – Back: 140mm – Base: 280mm
  • Built-in insulation in front, top cover and side panels
  • Decoupled motherboard tray, power supply tray and drive slots for reduced vibration and noise

Advanced Assembly and Handling

  • Generous space thanks to repositionable single HDD slots
  • Impressive features permit individual configurations and setups
  • Customizable cable management thanks to carefully placed pass-throughs
  • Two cleanable dust filters that can be conveniently removed from the front

High-quality Materials and Elegant Design

  • Premium aluminum surfaces
  • Steel parts from 0.8mm to 1.0mm for highest stability
  • Compatibility with all be quiet! products and all available graphics cards
  • RGB LED illumination with five switchable colors that can be freely positioned
  • Wireless charger for Qi enabled devices (e.g. smart phones)
  • Elegant side window of 4mm tinted and tempered glass

Outstanding Service and Support

  • 3-year manufacturer's warranty

All information courtesy of be quiet!  //www.bequiet.com/en/case/702


be quiet! Dark Base Pro 900 Testing:

Testing involved recording temperatures in degrees Celsius for the CPU and GPU during idle and load phases. The load was simulated by running Prime95’s small FFTs and 3DMark Vantage for one hour. The maximum temperatures were recorded using HW Monitor 1.21.0. Please note that each case is tested from its factory setup, including the location of fans, unless otherwise noted.


Testing Setup:



The thermal performance was about where I expected it to be for a case this size. With the 140mm SilentWings® 3 fans moving the air through the case, the heat from a mild overclock was not a concern. The best performing case I had tested up to this point was the Thermaltake Core X9, which is a large case with a lot of internal volume. And thanks to the large volume of the Dark Base Pro 900, the thermal performance was similar to the Core X9. The cooler temps are no surprise, but keep in mind that the Core X9 and the Dark Base Pro 900 are very different cases. The extra sound deadening material in the Dark Base Pro 900 goes a long way towards keeping the fan noise under control.

When I examined the case with the FLIR camera, the heat was concentrated at the top rear of the case, where the rear 140mm SilentWings® 3 exhaust fan pushes the warm air out of the case. Of course, the fans of the Noctua D14 move air toward the rear exhaust, so that is where I saw the heat concentrated. If I had used a top mounted radiator or installed exhaust fans at the top, I would expect to see heat coming out of the top vent, but the heat was really concentrated at the top rear of the case. The rest of the case was cool and quiet.

Looking at the right-hand picture, I usually see the heat from the power supply, too, but with the power supply inset and behind the mesh panels, it was not as obvious.

Then there is the heat from the GPU, and since it is a reference (blower) style, the hot air is pushed out of the case. While I like the way a blower style GPU rejects hot air from the case, they tend to be louder. However, in the Dark Base Pro 900, the GPU seemed a bit quieter when it was under a load. As far as GPU temperatures are concerned, with a reference card I really see about the same thermal performance regardless of the case.


  1. be quiet! Dark Base Pro 900: Introduction & Closer Look
  2. be quiet! Dark Base Pro 900: Working Components
  3. be quiet! Dark Base Pro 900: Specifications & Features
  4. be quiet! Dark Base Pro 900: Conclusion
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