ASUS Ryujin 240 AIO review | thermal performance testing

ASUS has recently entered the AIO cooler market by launching their ROG branded AIO coolers in Computex 2018. A lot of people are impressed with it and we knew we had to try them out one of these days.

ASUS sent over the ROG Ryujin 240 for us to try out and the cooler features addressable RGB, a LiveDash OLED display for showing stats like CPU temp, frequency, etc., and Noctua Industrial PPC 120mm fans.


The box follows the ROG branding similar to other ASUS products with all the relevant information like product specifications. You will also see the Noctua logo on the box as well as indication that this cooler is Aura RGB Sync compatible.

Inside the box you will find two 120mm Noctua Industrial PPC fans rated at 2000rpm, a ton of screws, brackets for both Intel and AMD sockets, and a manual.

The 120mm Industrial PPC fans is compatible with the chromax anti-vibration pads which are sold separately.

Closer look

Taking a look the components inside, you will see the pump housing which is different from all other AIO coolers. ASUS fitted this with an OLED display and a built-in 60mm fan to help cool your motherboard’s VRM and memory modules.

The top cover of the pump is removable and held together by magnets for easy installation. The CPU block is pre-applied with thermal paste for a straightforward installation, but we will not use this thermal paste for our testing.

The 240 radiator of the ROG Ryujin is a typical Asetek with a standard length and thickness that most 240mm radiators have and will fit nicely in most PC cases that support mounting on top or at the front of the case.

For the fan headers, you will find a standard SATA power for the RGB, and PWM headers to connect your fans and pump. There is also a USB header that connects directly to the motherboard so that you can use the Aura Sync software and the ASUS LiveDash software to customize the OLED display.

Powered up

With everything connected and powered up, you will notice that the OLED display is not as bright in some situations but it displays information clearly. Some orientations might even find clearance issues with the RAM modules as the pump housing is slightly larger than the typical AIO.

You can customize the OLED display with the LiveDash software for CPU monitoring or putting your own custom texts and logo.


Technical specifications
CPU socket compatibility Intel LGA 115X / LGA 1366 ~ LGA2066
AMD AM4 / TR4 (with mounting bracket included in the CPU package)
Radiator dimensions 272 x 122 x 27 mm
Fan(s) Size 120 x 120 x 25 mm
Quantity 2 pcs
Speed 450 ~ 2000 rpm
Airflow 121.8 CFM (max)
Air pressure 3.94 mmH2O (max)
MTTF >150 000 hours
Noise 29.7 dBA (max)
Pump Size 100 x 100 x 70 mm
Noise 31 dBA (embedded fan noise), pump noise N/A
Included accessories AMD mounting bracket, LGA 115X mounting backplate, user manual, lots of screws
Warranty 3 years
Test rig
CPU Ryzen 7 2700X @ 4.0GHz, 1.32v
Motherboard ASUS X370 Crosshair VI Hero
Memory 2 x 8GB G.Skill Sniper X 3400Mhz
Storage Samsung 860 Evo M.2 SSD
Power Supply Rave 800w
Thermal performance testing

For testing the thermal performance of the ROG Ryujin 240, we will be using AIDA64 for CPU stress testing as well as for monitor the CPU temperature. We will put the AIO up against the Noctua NH-D15 in both single and dual fan configuration.

The pre-applied thermal paste and used the IC Graphite Thermal Pad instead.

We tested the coolers with our open-case test rig to eliminate factors of airflow while the ambient temperature in our air conditioned room is around 24°C.

For the fan settings we kept the stock fan curve of our ASUS X370 Crosshair VI Hero motherboard.


ROG Ryujin 240 idle temp
ROG Ryujin idle temp

Out of the box, the ROG Ryujin idles at 36°C out of the box on our Ryzen 7 2700x overclocked at 4.0Ghz with 1.32v on the vcore.

ROG Ryujin 240 peak temp

After a CPU stress test run of around 10mins, the ROG Ryujin 240 AIO maxes out at 55°C which is very impressive.

ROG Ryujin peak temp
Noctua NH-D15 peak temp

For comparison, we also fired up the Noctua NH-D15 air cooler subjecting it to a stress test for around 10 minutes and we were surprised with the results.

On idle, the temperature of the NH-D15 is similar to the Ryujin 240 AIO but after stress testing, the results started to differ.

Single fan NH-D15

With the single fan configuration, the NH-D15 maxed out at 57°C, that’s 2°C difference from the Ryuijin 240 AIO.

NH-D15 single fan peak temp
Dual fan NH-D15

Using the dual fan configuration however, we started to see a huge significant difference between both coolers.

The NH-D15 maxed out at 47°C, beating the ROG Ryujin 240 AIO by 8°C under the same stress conditions.

NH-D15 dual fan peak temp
Peak temp summary

Final thoughts

In fairness to the ROG brand and the fanciness of the customizable OLED display and the inclusion of the Noctua Industrial PPC fans, the AIO itself is pretty cool. But in our opinion, it is something we wouldn’t invest our money on mainly because the ROG Ryujin doesn’t perform any better from the Noctua NH-D15 air cooler which is known to be at par with most custom liquid CPU cooling solutions.

However, if you are heavily invested in the ASUS ROG ecosystem (Aura RGB, and everything else about ROG) then we would see a reason for you to shell out some cash for this all-in-one liquid cooler.

The pump fan blowing towards the VRM is a nice touch and helps in keeping the temperature down especially when the CPU is extremely overclocked. In most situations however, the fans blowing through the entire case is more than enough to cool the VRM heatsinks.

For the OLED display, it’s a cute way to monitor your hardware or even put your own text or logo though we believe that it is not for everyone.  Therefore, people who will buy this AIO will be looking forward for that feature for sure since it’s a great way to visually monitor your hardware in real time.

In it’s own right, the ROG Ryujin 240 is a beautiful and great performing all-in-one liquid cooler. We love the hardware choice that ASUS made with the included Noctua fans and the built-in OLED display can really find a home in a true ROG-enthusiast’s rig.

  • Included Noctua Industrial PPC fans
  • Fancy OLED display that shows useful information
  • Easy mounting of the CPU block
  • Doesn’t perform any better than other top of the line 240mm all-in-one liquid coolers or air coolers like the NH-D15
  • Might be too expensive for non ROG enthusiasts

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