This article covers Thermalright Royal Knight 120 SE CPUエアクーラー.

Overview

The Thermalright Royal Knight 120 SE is a dual-tower CPU air cooler featuring six heat pipes and a compact 122×114×155mm heatsink. Its 155mm height makes it compatible with a wide range of mid-tower cases while still delivering solid cooling performance. It uses two different fans: a standard 120×25mm TL-C12B V2 (1500 RPM) in the center and a slim 120×15mm TL-C12015B (1800 RPM) on the front. This clever combination avoids RAM slot interference while maintaining strong airflow. Positioned in the mid-range segment, the Royal Knight 120 SE offers excellent value for builders who want dual-tower cooling without breaking the bank or worrying about case clearance.

Connectivity & Compatibility

The cooler supports Intel LGA1851/1700/1150/1151/1155/1156/1200 and AMD AM4/AM5 sockets, covering virtually all modern desktop platforms including Intel Core Ultra (Arrow Lake) and AMD Ryzen 7000/9000 series. For AMD builds, you reuse the motherboard's stock backplate. Intel installations use the included backplate. Both fans are 4-pin PWM controlled and can be connected via the included Y-splitter cable to a single CPU_FAN header.

Product Info

Released in late 2024, the Royal Knight 120 SE is priced around ¥6,620 on as of June 2026. The manufacturer provides a standard one-year warranty. Package contents include the heatsink, TL-C12B V2 fan, TL-C12015B fan, four fan clips, Y-splitter cable, Intel/AMD mounting kits, and a manual. Market positioning is firmly mid-range. The key differentiator is its 155mm height — rare for a six-heatpipe dual-tower design — which grants broad case compatibility without sacrificing cooling capacity.

Best Use Cases

Mid-tower case builders If your case has a CPU cooler height limit around 155mm, this cooler fits perfectly. Cases like the Fractal Design Pop Air or NZXT H5 Flow series are ideal matches. Users who want to show off RGB RAM The slim front fan sits above the RAM slots, not over them. This means tall RGB memory modules or large heatsinks won't interfere, and your RAM's lighting remains fully visible. Noise-sensitive users With fan speeds capped at 1500/1800 RPM and noise ratings of 25.6/26.1 dBA, this cooler is whisper-quiet at idle and remains unobtrusive even under gaming loads. Budget-conscious builders At around ¥6,600, you get dual-tower, six-heatpipe cooling that competes with coolers costing twice as much. It's an excellent choice for first-time builders or anyone upgrading from a stock cooler. ## Alternatives
Direct competitors in the same price bracket include the Arctic Freezer 34 eSports DUO (¥5,500) and Scythe Mugen 5 Rev.C (¥5,800). The Arctic Freezer 34 eSports DUO is a single-tower design with four heat pipes, so its cooling capacity is lower than the Royal Knight 120 SE's dual-tower layout. However, Arctic's fan quality is renowned for long-term quiet operation. The Scythe Mugen 5 Rev.C is a single-tower six-heatpipe cooler with similar 154.5mm height. Cooling performance is comparable, but the Mugen 5 ships with only one fan, giving the Royal Knight 120 SE an edge in high-load scenarios thanks to its dual-fan setup.

Things to Consider

Always check your case's maximum CPU cooler height before purchasing. While 155mm fits most mid-tower cases, slim or Mini-ITX enclosures may not accommodate it. For AMD builds, you must keep the motherboard's stock backplate installed. If you've removed or replaced it, you'll need to source a compatible backplate separately. The dual-tower design means you should verify clearance with your rear case fan. The combined fan thickness (25mm + 15mm) can be tight in compact cases. For CPUs exceeding 200W TDP — such as the Core i9-14900K or Ryzen 9 7950X — this cooler may struggle under sustained all-core loads. In those scenarios, consider a 280mm+ AIO liquid cooler or a larger high-end air cooler instead.

Product Disclosure (Amazon)

  • Manufacturer: シーゲイト(SEAGATE)
  • Seller: SKTコーポレーション※適格請求書発行事業者
  • Fulfilled by: SKTコーポレーション※適格請求書発行事業者
  • ASIN: B07DQ3KW45
  • Note: This article covers a manufacturer-made product based on Amazon listing details.