Dynatron B22 Intel Socket FCLGA 3647 Narrow ILM Heatsink and Fan - 1U

In this review the Dynatron B22 is evaluated as a dedicated active cooler for Intel Xeon CPUs in compact server builds. It is aimed squarely at system builders working with Socket FCLGA 3647 Narrow ILM processors who need a reliable blower-style solution for 1U or taller racks. The single biggest reason to consider the B22 is its combination of a vapor chamber copper base and a 4-pin PWM blower that supports up to 205 watts of heat dissipation, giving predictable thermal performance for Cascade Lake and Skylake family Xeon chips in constrained chassis.

Key Features

• Socket compatibility: Built specifically for Intel Socket FCLGA 3647 Narrow ILM so installers can expect a direct physical fit for supported Xeon families.
• Active blower fan: The 4-pin PWM blower allows automatic speed control under load, helping maintain target temperatures while avoiding constant maximum RPM noise.
• Vapor chamber base: A copper heatsink with a vapor chamber base spreads CPU heat quickly into the fin stack for more efficient dissipation in shallow server bays.
• 205 W cooling capacity: Rated to support processors with up to 205 watts of heat dissipation, making it suitable for many Platinum, Gold, Silver and Bronze Xeon parts used in 1U servers and larger systems.
• 1U server focus: Low-profile active design is recommended for 1U servers and up, offering a balance between height constraints and cooling performance.

Who It's For

The B22 is best for IT professionals, system integrators and hobbyists assembling compact rack servers that use Intel Xeon Platinum, Gold, Silver or Bronze processors on the FCLGA 3647 Narrow ILM socket. Its blower layout and PWM control suit dense chassis where directed airflow and automatic fan speed are important.

Users who need passive cooling, ultra-low noise for desktop workstations, or compatibility with any socket other than FCLGA 3647 Narrow ILM should look elsewhere; this cooler is purpose-built for server environments and specific Intel Xeon families rather than general consumer CPUs.

Pros & Cons

Pros

• Strong heat transfer from the copper heatsink with vapor chamber for effective thermal spread in constrained spaces.
• 4-pin PWM blower provides controlled cooling and integrates with motherboard fan curves for variable loads.
• Rated support for up to 205 watts of CPU heat dissipation, suitable for many high-end Xeon parts in server use.
• Designed for 1U server installations where height and directed airflow matter.

Cons

• Not intended for passive or ultra-quiet desktop builds; blower fans in 1U configurations can be audible under load.
• Specific to Socket FCLGA 3647 Narrow ILM, so it will not fit other socket types without modification.

Specifications

Product name	Dynatron B22
Socket	Intel Socket FCLGA 3647 Narrow ILM
Fan type	4-pin PWM blower
Heatsink material	Copper heatsink with vapor chamber base
Thermal support	Supports up to 205 watts heat dissipation
Recommended use	1U server and up, active cooler for Xeon family CPUs

Our Verdict

The Dynatron B22 is a practical choice for builders who need a focused, active cooling solution for Intel Xeon processors on Socket FCLGA 3647 Narrow ILM in 1U and larger servers. Its vapor chamber copper base and PWM blower give efficient heat transfer and controllable fan speed, making it a good value for deployments that prioritize compact, rack-friendly thermal management over desktop silence.

Frequently Asked Questions

Will this cooler fit other Intel sockets?
No. The B22 is designed specifically for Socket FCLGA 3647 Narrow ILM and is not compatible with other sockets without adapter hardware or modification.

Can it handle high TDP Xeon processors?
Yes. The manufacturer rates the B22 to support CPUs with up to 205 watts of heat dissipation, which covers many Cascade Lake and Skylake Xeon parts used in servers.

Is it suitable for a quiet workstation?
Not ideal. The blower-style 4-pin PWM fan is optimized for directed airflow in server chassis and can be more audible than low-speed tower coolers used in desktop workstations.