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Compact copper heatsink with vapor chamber base, stacked fins, pre-applied thermal grease, 1U server form factor

Dynatron

Dynatron B4A CPU Cooler FCLGA 3647 Narrow ILM 1U 205W

SKU CH-6NNZ-BP8GB MPN B4A

Cools Intel Xeon processors up to 205 W in 1U servers using a copper vapor-chamber heatsink with pre-applied thermal grease

  • Supported CPU socketsIntel FCLGA 3647 Narrow ILM
  • Cooler materialCopper1100 Stacked Fin Heatsink with Vapor Chamber Base
  • Heatsink dimensions108.0 × 81.0 × 27.0 mm
  • Product typeHeatsinks only
  • Product weight480 g
  • Key featuresIntel Xeon Platinum / Gold Family Processor, (products forme
  • Vapor chamber base moves heat rapidly from the CPU
  • Copper1100 stacked fins spread heat across a large surface
  • 205 W thermal capacity handles high-power Xeon processors
  • 1U profile fits dense server chassis at 27.0 mm tall
  • Shin-Etsu 7762 paste pre-applied for quick installation

Socket-Specific 1U Server Cooler

The Dynatron B4A is a copper heatsink designed for Intel FCLGA 3647 Narrow ILM sockets in 1U server chassis. It uses a Copper1100 stacked fin array with a vapor chamber base and ships with Shin-Etsu 7762 thermal grease pre-applied. The unit measures 108.0 x 81.0 x 27.0 mm and weighs 480 g.

1U Xeon Builds Up to 205W

This cooler suits administrators deploying Intel Xeon Platinum or Gold processors, formerly Skylake, within the 205W thermal envelope of a 1U form factor. It does not suit builds requiring active fan cooling, larger heatsink heights, or sockets other than FCLGA 3647 Narrow ILM.

205W Thermal Limit in 1U Height

The decisive specification is the 205W cooling capacity within a 27.0 mm stack height, matching the narrow ILM mechanical layout. Exceeding this power rating or using a different socket interface will prevent correct installation and thermal performance.

How it compares

Measured against everything we stock in CPU Coolers & Heatsink Fans, at today’s prices. Recalculated every night.

Price $36.99
Pricier than about 83% of the 1,559 comparable items (median $19.99).

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Specifications

Product
Brand nameDynatron
Model nameB4A
Product typeHeatsinks only
Size & build
Cooler materialCopper1100 Stacked Fin Heatsink with Vapor Chamber Base
Heatsink dimensions108.0 × 81.0 × 27.0 mm
Product weight480 g
Shipping weight0.55 kg
Package size136 × 112 × 3 mm
Compatibility
Supported CPU socketsIntel FCLGA 3647 Narrow ILM

Questions about this item

How much heat can the 205 W rating actually dissipate inside a 1U server?

The vapor-chamber base and copper 1100 stacked fins are rated to handle up to 205 W of CPU power in a 1U chassis.

Does the FCLGA 3647 Narrow ILM mounting limit which Xeon processors fit?

It fits only Xeon Platinum and Gold CPUs that use the Narrow ILM variant of the FCLGA 3647 socket.

Will the 108.0 x 81.0 x 27.0 mm heatsink clear standard 1U case lids and DIMM slots?

At 27.0 mm tall it is built for 1U height limits, and the 81.0 mm width avoids DIMM interference on narrow-ILM boards.

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