Will a 64mm thick 420mm rad fit? Some cases say they will fit a 420mm rad but a thick one will not go.

No, a 64mm thick 420mm radiator will most likely not fit in the be quiet! Light Base 900 LX due to limited clearance. While the case officially supports two 420mm radiators, its actual clearance for thicker radiators is restricted by other components, particularly the motherboard. The be quiet! Light Base 900 LX supports up to two 420mm radiators, typically in the top and bottom positions. A 64mm thick radiator combined with two standard 25mm thick fans (sandwich configuration) would have a total thickness of roughly 114mm ($64mm+25mm+25mm=114mm$), far exceeding the case's clearance. Use a thinner radiator: A thinner 420mm radiator (around 30–45mm thick) would be a much safer choice for the Light Base 900 LX. Consider a case with a larger interior, especially if you plan to use multiple thick radiators.

Is the case heavy when fully built?

32.56 lbs. empty for the 900 LX (no fans). Loaded w/ max fans/cooling, you're probably looking at 50 - 60 lb. range.

Is the air-flow efficient in this case?

Yes, the case includes 4 Light Wings 140mm PWM fans designed for high airflow and quiet operation, ensuring efficient air circulation.

Does this case support vertical and horizontal placement?

Yes, the case can be switched to an inverted or horizontal layout.

Does this case have a good aesthetic design?

Yes, the case features a fully windowed front and side panel for a stunning panoramic view on all your PC components and impressive illumination with a massive ARGB LED strip.

Can I use large fans and radiators with this case?

Yes, this case supports large fans and radiators. It can accommodate fans up to 140mm in various positions and radiators up to 420mm in size.

Can I easily build a computer with this case?

Yes. E-ATX is a large motherboard i am using a Rog Crosshair X870E Extreme motherboard. and a Be quiet Dark Rock Pro 5 270w TDP fan for my CPU and a Be quiet power supply a Pure power 13m 1000 watts. With this motherboard I added a few SSD's 4tb, one 16tb HD etc.

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be quiet! LIGHT BASE 900 FX Black ABS / Steel / Tempered Glass ATX Full Tower Case

Name: be quiet! LIGHT BASE 900 FX Black ABS / Steel / Tempered Glass ATX Full Tower Case
Uploaded: 2026-11-01
Description: be quiet! LIGHT BASE 900 FX Black ABS / Steel / Tempered Glass ATX Full Tower Case

(21)(9) Write a Review

Option: Light Base 900 FX

Light Base 600 DX
Light Base 900 DX
Light Base 900 FX

Color: Black

Black
White

Fully windowed front and side panel for a stunning panoramic view on all your PC components
Impressive illumination from every angle with a massive ARGB LED strip
4 Light Wings 140mm PWM fans for high airflow and quiet operation
Can be switched to inverted or horizontal layout in literal seconds thanks to intuitive handling
Extra spacious design for up to two 420mm radiators at the same time and an E-ATX motherboard
For easy installation of radiators and fans outside of the case, the brackets in the top and bottom can be removed quickly
Advanced VGA holder that prevents graphics card sag
Support for motherboards with backside connector design
2 ARGB and fan hubs with 12 connectors in total
State-of-the-art I/O panel with ARGB controller button and USB 3.2 Gen. 2 Type C

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

Overview

Specs

Reviews (21)

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LIGHT BASE 900 FX

Black

Exceptional from every angle

Be prepared for virtually any PC component available and make Light Base 900 FX Black with ARGB fans your creative show case.

Fully windowed front and side panel for a stunning panoramic view on all your PC components
Impressive illumination from every angle with a massive ARGB LED strip
4 Light Wings 140mm PWM fans for high airflow and quiet operation
Can be switched to inverted or horizontal layout in literal seconds thanks to intuitive handling
Extra spacious design for up to two 420mm radiators at the same time and an E-ATX motherboard
Support for motherboards with backside connector design

LOOK AT ME!

Panorama design for perfect visibility

You deserve to show off what you got. Large window panels on the front and the side allow you to watch your PC components at work anytime. This makes Light Base 900 FX Black the perfect choice as your show case.

BRIGHT LIGHT

3 meters of LEDs

Light Base 900 FX Black is predetermined for the big show. Nothing proves that more than the massive ARGB LED strip which is visible from all angles. The 3m long strip consists of 172 LEDs. With an included ARGB controller button and even more colors and modes with motherboard synchronization, you can make Light Base 900 FX Black truly your own. Express yourself!

LED CASE FANS

Optimized fan blades for high airflow

Light Base 900 FX Black comes with 4 pre-installed Light Wings fans. One fan is installed as rear exhaust, 3 Light Wings 140mm PWM fans with reversed fan blades are pre-installed on the side mounting. The reverse fans make sure your system is still an eye-catcher when installed as a side intake. Their 7 airflow-optimized fan blades not only reduce noise-generating turbulences but also ensure that this fan provides the performance that is needed, even in demanding configurations.

UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT…

Change the layout in literal seconds

It takes longer to read this text than to invert Light Base 900 FX Black. With its relocatable feet, you can invert the PC case literally in seconds. You can also choose a horizontal layout, which is executed just as quick. No matter which layout your gaming room requires: Light Base 900 FX Black delivers.

MAKE IT YOUR CASE

Large dimensions for endless creativity

The 4 pre-installed fans can be expanded to up to 10 in total, making Light Base 900 FX Black extremely versatile. With its extra spacious design, it can hold up to two 420mm radiators simultaneously, an E-ATX motherboard and even the most powerful graphics cards. Thanks to the two-chamber design, drives and cables are neatly tucked in the back and do not get in the way of airflow.

MAXIMUM USABILITY

A new level of convenience

The detachable radiator and fan brackets in the top and bottom make installation of your cooling setup very easy. Each bracket fits a 420mm radiator. On top of that, you can install another radiator with up to 360mm length in the side, for a whopping 3 radiators. Additionally, Light Base 900 FX Black comes with 2 ARGB and PWM hubs that offer 12 connectors in total. Their positions at the top and bottom allow you to conveniently connect your hardware.

HOLD MY GPU

For a neat interior

Light Base 900 FX Black features a flexible VGA holder that subtly prevents your GPU from sagging. The best part: This holder works in any orientation and with a horizontally or vertically installed graphics card. The result is a clean look even if you use big and heavy graphics cards.

ON THE FLIPSIDE...

Support for motherboards with backside connector design

The motherboard tray fully supports backside connector designs like Asus BTF (Back to Future), MSI Project Zero, and Gigabyte Project Stealth, for a true and cable-free view.

"What is a PC case other than a home for our components? Light Base is the fully glazed villa. And one with a marvelous architecture! Light Base is incredibly quick and easy to invert and can even be set horizontally for a retro feel."

Marco Marquardt, Product Developer BU PC Cases

Model
Brand	be quiet!
Model	LIGHT BASE 900 FX
Part Number	BGW71

Details
Type	ATX Full Tower
Color	Black
Case Material	ABS / Steel / Tempered Glass
PSU Mount	Rear
Motherboard Compatibility	ATX / E-ATX / Micro ATX / Mini ITX / XL-ATX
Side Panel	2 x Sides Tempered Glass Panel
LED	ARGB

Expansion
Internal 3.5" Drive Bays	up to 2x 3.5“ (1 included)
Internal 2.5" Drive Bays	up to 6x 2.5“ (4 included)
Expansion Slots	8

Front Panel Ports
Front Ports	1x USB 3.2 Gen. 2 Type C, 2x USB 3.2 Type A, HD Audio, (combined), ARGB controller, Reset button, Power button

Cooling System
Fan Options	Maximum fans (mm): Top: 3x 140 / 120 Side: 3x 140 / 120 Bottom: 3x 140 / 120 Rear: 1x 140 / 120 Preinstalled fans: Side: 3x Light Wings Reversed 140mm PWM Rear: 1x Light Wings 140mm PWM
Pre-installed Fans	Rear - 1 x 140mm / Side - 3 x 140mm
Radiator Options	Bottom - Up to 120mm / Bottom - Up to 140mm / Bottom - Up to 240mm / Bottom - Up to 280mm / Bottom - Up to 360mm / Bottom - Up to 420mm / Rear - Up to 120mm / Rear - Up to 140mm / Side - Up to 120mm / Side - Up to 140mm / Side - Up to 240mm / Side - Up to 280mm / Side - Up to 360mm / Top - Up to 120mm / Top - Up to 140mm / Top - Up to 240mm / Top - Up to 280mm / Top - Up to 360mm / Top - Up to 420mm

Dimensions & Weight
Max GPU Length	495 mm
Max CPU Cooler Height	190 mm
Max PSU Length	225 mm
Dimensions	532 x 327 x 484mm
Weight	15.8 kg

Additional Information
First Listed on Newegg	November 19, 2025

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Return for refund within: 30 days
Return for replacement within: 90 days
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The be quiet! LIGHT BASE 900 FX is a black ATX full-tower case for builders who want a spacious, highly configurable showcase, with panoramic tempered-glass panels, ARGB lighting, four preinstalled 140 mm fans, and room for up to two 420 mm radiators.

Recommended For

PC builders creating a visible RGB showcase: the panoramic glass, prominent ARGB lighting, and included Light Wings fans are designed to put the components on display.
Enthusiast builders fitting large components or custom liquid cooling: its spacious layout and support for up to two 420 mm radiators suit elaborate, high-end builds.
Builders who need flexibility in where or how the PC sits: the case can be configured in vertical, inverted, or horizontal orientations, unlike cases limited to one standard layout.
High-end PC owners aiming for a quiet showcase build with custom water cooling: PC Games Hardware found potential for quiet operation with a well-equipped modular loop.

Real-World Use Scenarios

For a showcase PC build, the glass front and side let the components remain visible from multiple angles, while the ARGB strips and included fans add lighting without requiring a separate fan set to get started.
When a PC needs to sit on the left side of a desk, the right side, or horizontally, the reversible layout gives builders more placement options than a fixed-orientation tower; allow room for the case’s substantial size and weight.
For a high-end gaming build with a long graphics card, the roomy interior and adjustable GPU support help accommodate large components and keep the card supported in a conventional horizontal installation.
For a custom water-cooling build, the case’s large interior and multiple radiator mounting locations give builders room to plan a multi-radiator setup; check component and radiator clearances for the specific layout before buying.
When assembling or upgrading a system with several fans or a large radiator, the removable top and bottom brackets can make those parts easier to work on outside the case, while the spacious rear area gives cables room to route behind the motherboard tray.

Spec Summary

Attribute	Value
Best For	ATX, E-ATX, Micro-ATX, Mini-ITX, or XL-ATX PC builds that need extensive cooling support, multiple drive bays, and ARGB lighting
Chassis And Compatibility	Black ATX full-tower chassis made from ABS, steel, and tempered glass, with tempered-glass panels on both sides and a rear-mounted PSU
Cooling And Lighting	Supports up to 3 × 140/120 mm fans at the top, side, and bottom, plus 1 × 140/120 mm at the rear; includes three 140 mm Light Wings Reversed PWM side fans and one 140 mm Light Wings PWM rear fan, with ARGB lighting
Radiator Support	Top and bottom: up to 420 mm; side: up to 360 mm; rear: up to 140 mm
Drive Bays And Expansion	Up to 2 × 3.5-inch bays (1 included) and 6 × 2.5-inch bays (4 included), with 8 expansion slots
Front I/O And Controls	1 × USB 3.2 Gen 2 Type-C, 2 × USB 3.2 Type-A, combined HD audio, ARGB controller, reset button, and power button
Component Clearance	Maximum GPU length 495 mm, CPU cooler height 190 mm, and PSU length 225 mm
Dimensions And Weight	532 × 327 × 484 mm; 15.8 kg
Model Identifiers	be quiet! LIGHT BASE 900 FX; part number BGW71

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