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Monsterlabo The Beast – 12th Gen – Fanless Made Extreme

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Incl. Tax: £1,378.00
Excl. Tax: £1,148.33

The beast system represents the ultimate in fanless performance offering the most powerful fanless PC possible. Dissipating up to 600W in semi passive (but still silent configurations) Two giant heatsinks passively cool the components within and 20 6mm copper heatpipes for enhanced thermal performance.

  •  Windows 11 / Windows 10 / Ubuntu LTS
  • Choice of 12th Gen Intel Processors – Powerful enough to cool K series CPU
  • Up to 128GB DDR4/DDR5 Dual Channel (4x32GB)
  • Choice of storage options
  • Wifi + Bluetooth
  • Dimensions: 21cm (W) x 45cm (H) x 38cm (L)
Customer reviews & experiences for Inside-Tech. Show more information.

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Product details


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

Capable of cooling the latest i9 12900K and the new RTX Amphere Series GPU, entirely fanless.

The Beast dissipates a total 400W in passive mode (150W CPU and 250W GPU) and nearly 600W in active (but still silent) mode (250W CPU and 320W GPU) with the addition of two optional Noctua fans set to an inadible level providing the most powerful silent PC on the market.

Everything is fanless by default, including the power supply.

the beast architecture


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 beast heart

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

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.

the beast performances


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.

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).

No fan.

the beast panels

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 2x 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, 1x 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 storage


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.

the beast electronics

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.


Case Format ATX PC Case
Integrated Cooling 2 x Passive Air Cooling Heatsinks (20 pipes & 6 copper thermal bridges)
Motherboard Format Mini-ITX to ATX
Processor LGA 1150-1151-1200-2066 / AM3-AM3+-AM4-TR4
Graphic Card Maximum Length Up to 290 mm (PCB)
Power Supply Up to ATX
Max CPU Power 300W+
Max GPU Power 300W+
Fanless configuration – Recommended Power CPU: 150W GPU: 250W
Active configuration – Recommended Power (2x 140mm < 500 RPM) CPU: 250W GPU: 320W
Materials Structural parts: steel (2.5 mm), copper and aluminum (6 mm)
Aesthetical parts: glass and aluminum
Colours Black painted (textured and shiny)
Feet Aluminum (6 mm)
Graphic card cooling Full spreader covering
Fan slot 2 x 140 mm (+ 2 x 140 mm optional)
Storage Up to 4 HDD 3.5” or 8 SSD 2.5”
Front Panel 1 Headphone, 1 Microphone, Power, USB-C, USB 2.0 x2, USB 3.2 Gen 1 x2
Back Panel Customizable
Dimensions 450 mm x 380 mm x 210 mm
Weight Heavy (approx 20KG.)

1 review for Monsterlabo The Beast – 12th Gen – Fanless Made Extreme

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