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Review of Asus ROG Ryujin III 360 liquid cooling system

13.01.2024 11:31

Specifications, delivery set

FamilyROG Ryujin
ModelAsus ROG Ryujin III 360 ARGB
Model code90RC00L1-MOUAYO
Cooling system typeclosed-loop liquid pre-filled non-expandable for processor
Compatibilitymotherboards with processor sockets:
Intel: LGA 1700 , 1200, 115x;
Fan typeaxial (axial), 3 pcs.
Fan modelROG Magnetic Daisy-chainable Fan (ROG MF-12S ARGB, Champion CF1225H12D)
Connecting fansmotor: 12V, 0.35A, 4-pin header (common, power, rotation sensor, PWM control)
RGB lighting: 3-pin header (addressable LED backlight — common, data, 5V power)
Fan dimensions120×120×25
Fan speed600—2200 (±10%) rpm
Fan performancemaximum 119 m³/h (70.07 ft³/min)
Fan static pressuremaximum 38 Pa (3.88 mmH2O)
Fan noise levelmaximum 36.5 dBA
Fan bearingno data
Fan lifeno data
Radiator dimensions400×120×30 mm
Radiator materialaluminum
Flexible line length400 mm
water pumpintegrated with heat sink
Pump dimensions (L×W×H)89×91×101 mm
Connecting the pumpmanagement and control: USB connector 9 pins;
power: 12 V, 4-pin connector (common, power, rotation sensor, PWM control)
Pump rotation speed800—3600 rpm
Pump noise levelno data
Pump service lifeno data
Heat sink materialcopper
Thermal interface of the heat sinkapplied thermal paste
  • fans with magnetic connectors
  • 3.5" LCD screen on pump
  • fan on pump for VRM cooling (5100 rpm, 5.53 mm water column, 21.08 ft³/min)
  • control and monitoring using Armory Crate software
  • braided hoses
  • 6 years warranty (must be specified upon purchase)
Contents of delivery
  • radiator and pump connected by hoses and filled with coolant
  • fans, 3 pcs.
  • cable for connecting fans, 2 pcs.
  • CPU pump mount kit
  • set of fan mounts for the radiator and radiator in the case
  • installation guide
  • set of stickers
  • loyalty card


We have already tested the liquid cooling system of Asus ROG Ryujin II 360 with LCD screen. The third version promises improvements, such as expanded animation support (increased memory from 16 to 32 MB for storing images and support for up to 2000 frames instead of 500). The main innovation is magnetic connectors on the fans, which, according to the manufacturer, will facilitate system installation.

The system is supplied in a box made of medium-thick corrugated cardboard. The outside of the box features images of the product, along with key features and specifications. Some of the images are laminated. Text information is mainly in English, but some inscriptions are also present in several languages, including Russian. Inserts, spacers, corrugated cardboard boxes, and plastic bags are used to protect and organize components. The sole of the heat sink and the thermal paste on it are protected by a cap made of transparent plastic, and the radiator fins on both sides are covered by pads, also made of transparent plastic.

Inside the box is what is listed in the table above:

The installation instructions are a high-quality printed brochure with Russian text. System descriptions and a PDF document with detailed installation instructions are available on the company's official website. The Armory Crate software required for management and monitoring is also provided there.

The system is sealed, charged and ready for use. The pump is integrated into a single unit with a heat exchanger. The copper plate that serves as the base of the heat exchanger and directly adjacent to the processor cover has a ground and lightly polished outer surface. In the center of the surface there is a small convex elevation with a difference of about 0.2 mm.

The dimensions of this plate are 55.5x55.5 mm, and the internal part, limited by the screw holes, measures approximately 45x45 mm.

Its central part is occupied by a thin layer of thermal paste applied.

Unfortunately, there is no reserve for its restoration included in the delivery set. The tests used high-quality thermal paste from another manufacturer. Looking ahead, we will demonstrate the distribution of thermal paste after all tests are completed. On Intel Core i9-13900K processor:

And on the base of the pump:

It is clearly visible that the thermal paste is evenly distributed in a thin layer over the entire surface of the processor cover, and the excess has gone beyond its limits. The area of tight contact, located approximately in the center, has a significant area. (The thermal paste distribution naturally changed a little after disconnecting the processor and pump.)

The pump body is made of durable black plastic.

A casing is attached to the top of the pump, held in place by magnets. The casing closes the fan, whose task is to cool the voltage regulation unit (VRM). The air from this fan is blown down.

The control board and LCD screen are fixed to the casing, while the surface of the screen is probably made of mineral glass. Two cables come from the pump: the first (91 cm long) with a 9-pin header connects to the corresponding USB header on the system board, the second (35 cm) with a 4-pin connector connects to the fan or pump connector on the system board.

The pump rotation speed can be adjusted by changing the PWM or voltage, as well as using a proprietary application. The fan speed on the pump can also be controlled only through this application. If the controller housing is not installed, the fan always runs at maximum speed.

To control and monitor the operation of this liquid cooling system, you must install the Armory Crate software on your PC. Features associated with this system include the ability to monitor current fan and pump rotor speeds, select from available profiles (four profiles), or create your own speed profiles based on processor temperature.

And also set what is displayed on the pump screen. A number of PC monitoring data can be displayed on the pump screen:

A static screensaver with the specified text:

Or a dynamic screensaver loaded from an animated GIF file, and/or as a slideshow of static images:

Or current time:

You can set the brightness of the screen, you can also set the processor temperature, upon reaching which a warning message will be displayed:

The rotation speed and lighting of the fans on the radiator are now controlled via the motherboard and/or an external controller.

The pump features a built-in fan designed to cool the voltage regulator unit (VRM) and other components surrounding the processor. It is believed that using liquid cooling systems with conventional water blocks may reduce system stability due to potential VRM overheating. Unlike air coolers, when installing liquid cooling systems, these units are cooled less efficiently. The built-in fan, while increasing noise levels, helps reduce the temperature of the VRM heatsinks, which can improve overall system reliability.

The hoses are resilient and relatively flexible and have a braided outer diameter of approximately 12mm. The length of the hoses along the flexible part, excluding the sleeves, is 38 cm, which makes them quite long. The L-shaped fittings at the pump inlet rotate, making installation easier. The hoses can be secured with the included Velcro strap.

The radiator is made of aluminum and covered with a matte black coating, which is relatively durable.

The fan frame is made of durable black plastic. Rubber vibration-isolating pads are installed on the corners of the fan frame. However, given the mass of the fan and the rigidity of these pads, it can be assumed that the system as a whole does not have significant anti-vibration properties due to the high resonant frequency.

The fans support PWM control. The impeller blades are limited by a ring, which can improve the efficiency of the fan. The impeller is made of white translucent plastic, illuminated by ARGB LEDs located around the circumference of the fan stator.

The system's electrical connections are unusual. Each fan is equipped with two magnetic connectors — one female and one male. They can be connected to each other for easy installation and a clean appearance. To connect connected fans to motor power supplies and lighting, one of two cables with magnetic connectors is used. Given that the cables are connected from different sides of the fan, users can choose the most convenient connection option, making installation more flexible and neat.

These cables feature standard four- and three-pin connectors for connecting motors and addressable lighting.

The fans provide control via PWM. All three fans are controlled using PWM, but the rotation speed is monitored only for one, to which the cable is connected.

The assembled system with fasteners for LGA 1700 weighs 1784. The fasteners are mainly made of hardened steel and have a durable galvanic or paint coating. The frame on the back of the motherboard (for Intel) and the mounting spacers for AMD are made of durable plastic and equipped with steel threaded sockets and stands, respectively.

The manufacturer provides a 6-year warranty on this LSS. However, in the specific conditions for the sale of goods, it is worth clarifying whether the seller provides such warranty conditions. In any case, a long warranty indicates a high level of confidence of the manufacturer in the quality of its product.


Determining the dependence of the cooler fan speed on the PWM duty cycle and/or supply voltage

An excellent result was obtained: the rotation speed shows a monotonic and almost linear increase when the fill factor changes from 20% to 100%. A wide range of rotation speed adjustment provides flexibility in control. Even when the fill factor drops to 0%, the fans do not stop. This feature can be useful if the user is looking to create a hybrid cooling system that operates in a passive mode completely or partially at low loads.

Adjustment using voltage ensures stable rotation in approximately the same range. The fans stop when the voltage drops to 1.6 V (the tachometer signal stops at approximately 2 V), and start when the voltage is between 2.0 and 3.0 V. The fans are safely connected to a 5 V voltage source.

The pump rotation speed is also controlled using PWM and supply voltage. Below are the corresponding graphs.

When the fill factor (FC) decreases to 0%, the pump does not stop, but it does not need to be stopped in any case. The pump stops at 4.4 V and starts at 4.8 V. It is still better not to connect the pump to 5 V.

Determining the dependence of the processor temperature when it is fully loaded on the rotation speed of the cooler fans

In this test, all cores of the Intel Core i9-13900K processor ran at 4.1 GHz. The pump and fans on the radiator were controlled using PWM. The fan operating mode on the pump is the default.

In this test, the Intel Core i9-13900K processor shows no signs of overheating at an ambient temperature of 24 degrees Celsius at fan speeds, which are achieved by reducing the duty cycle to 20%, which roughly corresponds to 630 rpm. The maximum consumption, according to monitoring data, was approximately 207 W, and for the processor power connectors — 254 W. It is worth noting that the base power of this processor is estimated at only 125 W, and its standard maximum short-term (turbo limit) is 253 W.

Determining the noise level depending on the rotation speed of the cooler fans

The noise level of this cooling system can vary over a wide range. Depending on individual characteristics and other factors, noise can range from 40 dBA and above, which in our opinion is very high for a desktop system, to a range of 35 to 40 dBA, which can be considered tolerable. Noise levels below 35 dBA do not stand out much from typical quiet PC components such as case fans, power supply and graphics card fans, and hard drives. A noise level below 25 dBA can be considered silent. The background noise level in this test was 16.6 dBA (the conventional value shown by the sound level meter).

Plotting the dependence of real maximum power on noise level

Let's move away from the test bench conditions (24 degree ambient) and move on to more realistic scenarios. Let's assume that the temperature of the air entering through the cooling system fans can reach 44 °C (which seems to be a realistic scenario, for example, when the LCS is installed to blow air out of a case in which a powerful video card is actively running). However, we do not want to allow the processor temperature to rise above 80 °C under maximum load. Limiting ourselves to these conditions, we will try to identify the dependence of the actual maximum processor power consumption (denoted as Pmax, previously we used the term «Max TDP») on the noise level.

Taking a noise level of 25 dBA as a conditional criterion for noiselessness, we can estimate the approximate maximum power consumption of the processor. For an Intel Core i9-13900K processor, this is approximately 235 W. If noise levels are not taken into account, the power limits can be increased to almost 265 W. However, it is worth clarifying that these values were obtained under conditions of intensive blowing of the radiator with air heated to 44 degrees. As ambient temperatures change and/or maximum processor temperature increases, the specified power limits for silent operation and maximum power may change.


To properly understand the test results, it is important to consider the following:

The purpose of testing is primarily to determine the cooling capacity of liquid cooling (LCC). The processors used in the tests act only as a heat source to evaluate the thermal resistance of the LSS in various modes. Consequently, the power (heat dissipation) of the processor is artificially adjusted depending on the characteristics of the cooling system, which can lead to it being either higher or lower than the standard operating modes of the processor. The main requirement is that the processor should not overheat over the entire range of the cooling capacity of the LCS, and there should be a significant difference in the change in processor temperature.

Using the Asus ROG Ryujin III 360 liquid cooling system, it is possible to create a relatively silent computer (with a noise level of 25 dBA or lower) equipped with a processor such as the Intel Core i9-13900K. This assumes that the power consumption of such a processor at maximum load does not exceed 235 W, the temperature inside the case does not rise above 44 °C, and the maximum processor temperature is limited to 80 °C. If the cooling air temperature changes, the processor temperature threshold increases (up to 100 °C) or less stringent noise requirements, the power limits can be adapted. In fact, if you don't overclock or push the power limits of the Intel Core i9-13900K, the liquid cooling system will be sufficient for silent cooling in real-world workload scenarios, including moderate overclocking.

The LCD screen on the pump can not only complement the internal space of the case, but also provide information about the current PC parameters. Illuminated fans and magnetic connectors make system installation easy. High quality workmanship, braided hoses and a fan on the pump designed to cool the VRM and other components also deserve a mention. Management and monitoring of the operation of the life-support system is carried out through the Armory Crate software, which provides advanced functions.