The Beast
Fanless made Extreme

The ATX PC case with a dual passive cooling solution able to cool down 600W


The Beast is the culmination of a long process of reflection carried out at MonsterLabo over the past 2 years. Deeply rooted in MonsterLabo DNA, The Beast meets our #1 commitment: build PC cases that are the most powerful, smart and fanless possible.


As with The First, The Beast is also designed around its cooling solution. But we went a level further this time: the case itself becomes a part of it, with its front and back panels - directly connected to the heatsinks – spreading the heat over its 6 mm aluminum thickness.


As with The First, all parts can be replaced or upgraded when required.


Side panels are offered in aluminum - for those who prefer minimalism and sobriety - or in tempered glass - for those who prefer RGB and unicorn/spaceship/eyes bleeding themed PCs.


Our ultimate goal is just to offer you the best fanless and most sustainable PC case ever.

The Heart²

The case is composed of :

  • 2x giant heatsinks (3 kg each) passively cooling the electronics,

  • 20x 6mm heat pipes, 10x for each chip. Hell yeah, we know, not bad for a PC!

  • 6x copper thermal drains connecting the heatsinks to the 6mm width aluminum front and back panels for enhanced thermal spreading.

  • For those who really want to push the limits, 2x 140 mm fan slots are available on the top of the coolers.


Thanks to our innovative brackets system, most of motherboards (mini-ITX up to ATX) and graphic cards (PCB with a maximum length of 290 mm after removing the factory cooling) are compatible with The Beast.


Last but not least, The Beast dissipates 400W in passive mode (150W CPU and 250W GPU) and nearly 600W in active (but still silent) mode (250W CPU and 320W GPU).


You’re welcome.

High-end GPU spreader

If you ever plan to build a fanless case, no matter the size of the heatsink, you should always pay careful attention to the cooling of the VRM’s and Memories. We also did it at MonsterLabo.


For “regular” GPU (140/160W TDP), our current solutions made of machined and taped heatsinks still perfectly fit.


However, we made a very special work for high TDP graphic cards and especially for the new Ampere generation.

These full covering spreaders are designed and produced in collaboration with EKWB and are included with The Beast.


First bench tests have been performed on 3D Mark, Furmark and AIDA64 with the configuration below:

Processor: AMD Ryzen 7 3800XT

Graphic card: Nvidia GeForce RTX 2080 Super

Motherboard: ASUS TUF Gaming B550M-Plus

Power Supply: Seasonic Prime Titanium Fanless 600

A full covering spreader for the graphic card has been used.

No fan.

Front & Back panels

The front panel features a central anodized power button. On its left, 2x USB 2.0 and 2x USB 3.1 are available. On its right, audio/micro ports as well as 1x USB-C complete the port panel.


The back panel is fully customizable. In standard format, The Beast comes with 1x slot for Ethernet cable, 6x slots for USB cables, 2x USB-C and 4x HDMI or Display port cables.


These parts can be removed and replaced with 3D printing customized panels. The back of the case is completed with an engraved plaque highlighting the serial and the unit numbers.


The Beast has many slots for HDD and SSD storages. Depending on your needs, you can mount up to 4x HDDs 3.5'' or 8x SSDs 2.5''. Their access is made easy thanks to the removable side panels. Their assembly is also facilitated thanks to special fixtures designed for The Beast. This location can also conveniently be used for a PCI card extension.


Whatever the final use, The Beast will allow more than enough space for your storage!


Special note: we do not recommend (at all) the use of HDDs. They tend to be very loud, especially into a fanless case (= 0dB). We mean it.

With electronics

With The Beast, we want our users to be free to choose any component they want, without any limit!​


The Beast is compatible with the vast majority of motherboards (mini-ITX up to ATX) and graphic cards (PCB with a maximum length of 290 mm after removing the factory cooling). LGA 1150-1151-1200-2066, AM3-3+-AM4-4+-TR4 and previous generations are compatible.


The Beast also supports SFX, SFX-L and ATX full length power supplies.


Motherboard fixtures have been designed to ensure the robustness of the assembly while the graphic card is rigidly fixed to the heatsink cooling block.


Finally, special parts are included at the bottom of the case to optimize the cable routing and improve the airflow into the case.



The team is composed of makers, from ideas to reality. Our goal is to provide people with products that meet their hidden desires. 

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