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Black 240 mm radiator with two 120 mm ARGB fans and a square water block showing a 3.5 inch LCD screen

ASUS

ASUS ROG RYUJIN III 240 ARGB liquid cooler

SKU CH-66AJ-0BY6A MPN ROG RYUJIN III 240 ARGB

All-in-one liquid CPU cooler with a 240 mm radiator, Asetek 8th gen pump, two magnetic 120 mm ARGB fans and a 3.5 inch LCD display for system monitoring and custom animations

  • TypeLiquid Cooling System
  • Block CompatibilityAMD Socket AM4 / AMD Socket AM5 / Intel LGA 1150 / Intel LGA
  • Block Dim.89 x 91 x 101 mm
  • Block MaterialCopper
  • Radiator Size279.5 x 120 x 30 mm
  • Radiator MaterialAluminum

Fan Size 2 Fan Slots (120mm)

Color Black

Model ROG RYUJIN III 240 ARGB

Struck-through versions exist but are not stocked here.

  • Real-time stats and custom GIFs on a 3.5" LCD
  • Asetek 8th gen pump with 3-phase motor for high flow and low noise
  • Embedded ring-frame fan directs airflow toward VRM zone
  • Magnetic daisy-chain ARGB fans with Gen 2 LEDs simplify lighting sync
  • Armoury Crate controls pump, fans and LCD animations from one app

3.5-inch LCD monitoring block

The ROG Ryujin III 240 ARGB is an all-in-one liquid CPU cooler built around a 240 mm aluminium radiator and a copper cold plate measuring 89 x 91 x 101 mm. It supports AMD Socket AM4, AM5 and Intel LGA 1150, 1151, 1155, 1156, 1200 and 1700 platforms. A 3.5-inch LCD on the pump head shows real-time hardware data or custom GIF animations. The unit ships with 400 mm sleeved rubber tubes for flexible routing.

Asetek 8th gen pump and magnetic daisy-chain fans

The integrated Asetek 8th generation pump uses a three-phase motor to increase flow and reduce impedance while lowering acoustic output. Two 120 mm ARGB fans with a ring-shaped frame design spin between 600 and 2200 RPM, delivering 70.07 CFM at 36.45 dB(A). Their magnetic daisy-chain connectors simplify cable management and synchronise lighting effects through Armoury Crate software, which also controls pump speed, embedded fan curves and LCD content. A one-year AIDA64 licence is included for extended sensor logging.

240 mm radiator capacity and clearance limits

The 279.5 x 120 x 30 mm radiator fits standard dual-fan mounting locations and handles typical mainstream and enthusiast CPU thermal loads. The 400 mm tube length reaches most mid-tower and full-tower layouts but may fall short in oversized chassis or rear-exhaust routing. Builders needing greater surface area for sustained heavy overclocks or silent operation at extreme wattages will require a larger radiator format.

Highlights

  • Real-time stats and custom GIFs on a 3.5" LCD
  • Asetek 8th gen pump with 3-phase motor for high flow and low noise
  • Embedded ring-frame fan directs airflow toward VRM zone
  • Magnetic daisy-chain ARGB fans with Gen 2 LEDs simplify lighting sync
  • Armoury Crate controls pump, fans and LCD animations from one app

Specifications

BrandASUS
SeriesROG RYUJIN 240
TypeLiquid Cooling System
Block CompatibilityAMD Socket AM4 / AMD Socket AM5 / Intel LGA 1150 / Intel LGA 1151 / Intel LGA 1155 / Intel LGA 1156 / Intel LGA 1200 / Intel LGA 1700
Block Dim.89 x 91 x 101 mm
Block MaterialCopper
Radiator Size279.5 x 120 x 30 mm
Radiator MaterialAluminum
Fan Size2 Fan Slots (120 mm)
Fan Dim.120 x 120 x 25 mm
Fan RPM600 - 2200 RPM +/- 10%
Fan Air Flow70.07 CFM
Fan Noise36.45 dB(A)
ColorBlack
LED ColorARGB
Tube Dim.Tube Length: 400 mm
Tube MaterialSleeved Rubber tube
Shipping weight1.41 kg
Package size307 × 241 × 135 mm

Other versions of this model

4 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

How often should the sleeved rubber tubes and Asetek 8th gen pump coolant be checked or replaced?

The sealed loop is maintenance-free for its service life; no user coolant changes or tube replacements are required under normal operation.

What thermal limit does the 240 mm aluminium radiator with 70.07 CFM fans hit first during prolonged loads?

The radiator reaches its heat-rejection ceiling when coolant temperature stabilises, typically after several minutes of sustained high-wattage CPU output.

How loud is the cooler at the 2200 RPM maximum fan speed and 36.45 dB(A) rating during all-day use?

At full speed the two magnetic 120 mm fans produce 36.45 dB(A); the embedded pump fan and 8th gen Asetek pump add minimal extra noise.

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