Dynatron B5 2U Narrow ILM CPU Cooler - High Airflow for 2U Servers

Our review of the Dynatron B5 2U Active Narrow Type CPU Cooler finds it best suited for datacenter or workstation builders who need a compact, highairflow solution for Intel FCLGA3647 narrow ILM sockets. The bottom line: this cooler pairs a 60 x 60 x 25 mm PWM fan with an aluminum heatsink and embedded heat pipe to handle up to 205 W in a 2U server chassis, offering focused cooling where chassis height is limited. For anyone running heavy Intel server CPUs in a constrained 2U bay, the B5 delivers straightforward thermal performance without gimmicks.

Key Features

• Compact 2U form: The 108.0 x 80.0 x 66.0 mm footprint is designed specifically to fit narrow ILM 2U server layouts while keeping clearance for adjacent components.
• 60 x 60 x 25 mm PWM fan: The PWM control lets the fan scale from quiet low speeds to full 7000 RPM when the CPU demands maximum cooling.
• Embedded heat pipe: A heat pipe inside the aluminum heatsink improves heat transfer from the CPU contact plate into the fins for more efficient dissipation.
• High airflow capability: Measured airflow reaches about 40.6 CFM at full duty, which helps remove heat quickly in tightly packed server racks.
• Durable bearings and certification: The 2 ball bearing fan construction and RoHS and UL certifications indicate reliable mechanical life and safety conformity for commercial deployments.

Who It's For

The Dynatron B5 is aimed at system integrators, rackserver technicians, and IT teams building or servicing 2U server systems that use Intel FCLGA3647 narrow ILM CPUs and need a dependable, compact cooler capable of handling up to 205 W. It fits environments where chassis height is constrained and where PWM fan control is available to balance acoustics and cooling.

Those who should look elsewhere include desktop enthusiasts using standard tower cases, or buyers who need ultraquiet passive cooling; the B5 is optimized for server airflow and duty cycles rather than silent desktop operation.

Pros & Cons

Pros

• Small footprint fits narrow ILM 2U racks while providing targeted cooling for high power CPUs.
• PWM fan allows dynamic speed control to match thermal load and system policies.
• Embedded heat pipe and aluminum fins improve heat spread and dissipation in a compact package.

Cons

• Fan noise can be noticeable at higher duty cycles, reaching around 50 dBA at 100% speed.

Specifications

Our Verdict

The Dynatron B5 2U cooler is a pragmatic choice for 2U server builds that require a compact, PWMcontrolled fan and reliable heatpipeassisted aluminum cooling for Intel narrow ILM sockets. It offers strong airflow and dependable construction for the price, making it a good value for IT professionals who need predictable thermal performance in spacerestricted racks.

Frequently Asked Questions

Does this cooler fit Intel FCLGA3647 narrow ILM sockets?
Yes, it is specifically designed for Intel FCLGA3647 narrow ILM server mounts.

What is the fan noise like under load?
The fan can reach about 50 dBA at 100% duty; however PWM control allows quieter operation at lower duty cycles.

Can it handle high TDP server CPUs?
Dynatron rates it for up to 205 W, so it is suitable for many highpower server CPUs within that limit.