Overview

The Scythe Kotetsu MARK4 (model SCKTT-4000) is a 120mm side-flow CPU air cooler that balances high cooling performance with quiet operation. Building on the proven Kotetsu series, it supports modern sockets including Intel LGA1700/LGA1200 and AMD AM5/AM4. The design emphasizes easy installation and maintenance, making it suitable for both first-time builders and experienced enthusiasts.

This product is sold on Amazon.co.jp by Amazon.co.jp (ASIN: B0GK7HW3RB).

Key Features

  • 120mm side-flow fan: Features a PWM-controlled 120mm fan with a speed range of approximately 800–2000 RPM, ensuring quiet operation at low loads and adequate airflow under stress.
  • Efficient cooling: Four 6mm heat pipes transfer heat from the CPU base to a dense fin array. Rated for CPUs with a TDP of up to about 200W, it handles mid-range to upper-mid-range processors comfortably.
  • Tool-free installation: Includes mounting kits for Intel and AMD sockets. The backplate comes pre-installed, simplifying the process for beginners.
  • Memory clearance: The cooler measures 154mm in height, fitting most ATX and Micro-ATX cases. The fan can be shifted upward to avoid tall RAM modules (up to about 45mm without interference).
  • Long-life FDB bearing: The fan uses a fluid dynamic bearing for durability and quieter operation over time.

Compatibility Guide

  • Supported sockets: Intel LGA1700/1200/115x, AMD AM5/AM4. Does not support older sockets like LGA2066. Check your motherboard's socket type before purchase.
  • RAM clearance: With the fan in its default position, memory height up to approximately 45mm is cleared. For taller RAM, slide the fan up slightly – ensure your case has enough width (minimum ~170mm recommended).
  • Case clearance: The 154mm height fits most mid-tower cases, but verify your case's CPU cooler clearance. Some compact cases may require a low-profile cooler.
  • Cooling capacity: Suitable for CPUs up to about 200W TDP (e.g., Core i7 or Ryzen 7). For high-end Core i9 or Ryzen 9 processors under sustained load, a larger cooler or liquid cooling may be preferable.

Ideal Builds

  • Quiet mid-range gaming PC: Pair with a Core i5-14600K or Ryzen 7 7800X3D. The Kotetsu MARK4 stays quiet under light loads and remains reasonably silent during gaming.
  • Budget-conscious builds: Offers excellent value compared to large air coolers or AIO liquid coolers, freeing up budget for a better GPU or faster storage.
  • Compact cases: At 154mm, it fits many smaller cases that still accept standard ATX power supplies. Always double-check case specifications.

Upgrade Considerations

  • Potential bottleneck: If you plan to upgrade to a high-end CPU like a Core i9-14900K or Ryzen 9 7950X, the Kotetsu MARK4 may struggle under heavy all-core workloads. Consider a larger dual-tower cooler or a 240mm+ AIO for those chips.
  • Memory upgrades: When switching to tall RGB RAM, you may need to adjust the fan position. Check your case's width and the RAM height before ordering.
  • Case swaps: If you move to a different case, the cooler should remain compatible as long as the new case has sufficient clearance. The mounting hardware is universal for supported sockets.

Product Disclosure (Amazon)

  • Manufacturer: SCYTHE
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • Model: SCKTT-4000
  • ASIN: B0GK7HW3RB
  • Note: This article covers a manufacturer-made product based on Amazon listing details.