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SilverStone IceMyst 420 AIO liquid cooler with ARGB water block and three radiator fans

Silverstone

SilverStone IceMyst 420 liquid cooler

SKU CH-3909-BY20M

A 420 mm all-in-one liquid cooler with an expandable water block for stacking 70 mm fan modules, modular cabling, an ARGB controller with 10 lighting modes, and radiator-optimised fans.

  • Expandable water block supports stackable 70 mm IMF70 fan modules for targeted component cooling
  • Three-phase six-pole pump motor runs quietly for low-noise operation
  • Modular cabling design simplifies cable routing and management inside the case
  • Included ARGB controller offers 10 lighting modes with adjustable brightness and speed
  • Broad socket compatibility covers Intel LGA 115X, 1200, 1700, 1851, 2011, 2066 and AMD AM4, AM5

Expandable 420 mm AIO cooler

The SilverStone IceMyst 420 is a closed-loop liquid cooler with a 420 mm radiator and an expandable water block that accepts stackable 70 mm IMF70 fan modules. A three-phase six-pole pump motor and a 360° rotatable top cover keep the unit quiet while allowing flexible hose routing. An included ARGB controller provides ten lighting modes with adjustable brightness and colour-change speed.

Upgrade from smaller AIOs or air coolers

The 420 mm radiator surface and bundled radiator-optimised fans deliver higher airflow and static pressure than 240 mm, 280 mm or 360 mm models, making the jump worthwhile when thermal headroom limits CPU boost clocks. Builders whose current cooler cannot dissipate the heat of modern high-TDP processors will see lower core temperatures and quieter operation under sustained loads.

Fits modern Intel and AMD platforms

The cooler mounts on LGA 115X, 1200, 1700, 1851, 2011 and 2066 sockets as well as AMD Socket AM4 and AM5, covering current mainstream and high-end desktop CPUs. Modular cabling reduces clutter around the CPU socket, while the stackable IMF70 fans direct extra airflow toward VRM heatsinks or M.2 slots when case clearance permits. Buyers who need a single-slot air cooler or lack space for a 420 mm radiator cannot use this product.

Highlights

  • Expandable water block supports stackable 70 mm IMF70 fan modules for targeted component cooling
  • Three-phase six-pole pump motor runs quietly for low-noise operation
  • Modular cabling design simplifies cable routing and management inside the case
  • Included ARGB controller offers 10 lighting modes with adjustable brightness and speed
  • Broad socket compatibility covers Intel LGA 115X, 1200, 1700, 1851, 2011, 2066 and AMD AM4, AM5

Specifications

No published specifications for this item yet.

Questions about this item

How much clearance do the three radiator fans and any IMF70 stack modules need inside the case?

The 420 mm radiator mounts three fans, and each IMF70 module adds 70 mm of height on top of the water block, so total clearance depends on how many modules you stack.

Which way should the three-phase pump top cover face during installation, and what do builders often miss?

The water block top cover rotates 360°, so align the logo or tubing outlets before tightening the mounting bracket; the step often missed is re-checking orientation after the bracket is snug.

What parts of the IceMyst 420 will need replacement first, and how can I tell?

The radiator-optimised fans and pump motor are the wear items; rising coolant temperatures or unusual pump noise signal it is time to replace the AIO unit.

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