This article covers ASUS ROG Ryujin III 240 オールインワン 液体 CPU クーラー 240mm ラジエーター付きAsetek 第8世代ポンプ.

Overview

The ASUS ROG Ryujin III 240 is a 240mm all-in-one (AIO) liquid CPU cooler that sits at the top of ROG's cooling lineup. Powered by Asetek's 8th-generation pump with a three-phase motor, it delivers higher flow rates and lower impedance while keeping noise in check. The standout feature is the 3.5-inch color LCD on the pump head, which can display real-time system stats like CPU temperature and clock speeds, or play custom GIF animations. Two Noctua industrialPPC-2000 PWM fans come pre-installed on the 240mm radiator, pushing up to 2000 RPM with a rated noise level of just 36.45 dBA. An embedded fan in the pump block directs airflow over the motherboard's VRM area, and the ring-frame fan design helps reduce turbulence around the radiator. The cooler supports Intel LGA1700/1200/115x and AMD AM5/AM4 sockets, making it compatible with virtually all modern high-end and mainstream CPUs. If you're building a premium gaming or workstation PC and want both strong thermal performance and a personalized visual centerpiece, the Ryujin III 240 is a compelling option.

Connectivity & Compatibility

Socket support: Intel LGA1700, LGA1200, LGA115x; AMD AM5, AM4 (mounting kits included). Pump and embedded VRM fan connect via a 4-pin PWM header. The two radiator fans also use PWM for speed control and can be connected to a motherboard fan header or the included splitter cable. The LCD screen requires an internal USB 2.0 (9-pin) header for data and power. Armoury Crate software handles customization. The 240mm radiator (120×240mm) fits most mid-tower cases with top or front mounting positions. Always check your case's radiator clearance before purchase. * Pump block height is approximately 55mm (not officially confirmed) — be mindful of tall VRM heatsinks on some motherboards.

Product Info

Released in May 2023, the ASUS ROG Ryujin III 240 is positioned as a high-end AIO cooler. It commands a premium price?around ￥37,607 in Japan as of July 2026?justified by the Asetek 8th-gen pump, Noctua fans, and the customizable LCD display. The warranty is six years (proof of purchase required). Accessories include mounting brackets for Intel and AMD, thermal paste, and a PWM fan splitter cable. No fan hub is provided, but the splitter allows both radiator fans to share one motherboard header.

Best Use Cases

High-end gaming rigs: Users running Core i9 or Ryzen 9 processors who need efficient 240mm cooling without stepping up to a larger radiator. The combination of the Asetek pump and Noctua fans handles heavy gaming and streaming loads well. If you have room for a 360mm radiator, consider the Ryujin III 360 for extra headroom. Aesthetic-conscious builders: The 3.5-inch LCD is a natural centerpiece for cases with tempered glass side panels. Armoury Crate makes it easy to display GIFs, logos, or live metrics. If you don't care about the screen, cheaper AIOs with equivalent cooling exist. Quiet-performance seekers: The Noctua iPPC-2000 fans are tuned for high airflow with minimal noise, keeping the system quiet even under load. For absolute silence, a larger radiator or low-fan-speed configuration is recommended. Long-term reliability minded users: Asetek pumps have a strong track record. Six years of warranty and proven durability make this a solid choice for a daily driver. However, liquid cooling always carries a small leakage risk compared to air coolers.

Product Disclosure (Amazon)

  • Manufacturer: ASUS
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B0DG7L6W6V
  • Note: This article covers a manufacturer-made product based on Amazon listing details.