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Compact copper skived heatsink with 80mm PWM blower fan, horizontal mount, 28mm tall

Dynatron

Dynatron B3 CPU cooler LGA 3647 80mm 165W

SKU CH-82SY-2Z2R3 MPN B3

Cools Intel LGA 3647 Xeon CPUs up to 165 W with an 80 mm PWM blower and copper skived-fin heatsink in a 28 mm low-profile design

  • Fan size80 mm
  • Supported CPU socketsIntel LGA 3647
  • Bearing design2 Ball Bearing
  • Rotational speedAt Duty Cycle 20%: 1000 +/- 200 RPM At Duty Cycle 50%: 4000
  • Airflow rateAt Duty Cycle 20%: 3.0 CFM At Duty Cycle 50%: 12.0 CFM At Du
  • Operating noiseAt Duty Cycle 20%: 16 dBA At Duty Cycle 50%: 44.9 dBA At Dut
  • Cools 165 W Xeon CPUs in tight 1U servers
  • Copper 1100 skived-fin heatsink spreads heat fast
  • 80 mm PWM blower spins 1000–7000 RPM for scalable airflow
  • 2 ball bearing fan runs 16 dBA at 20 % duty
  • Slim 28 mm height fits narrow ILM LGA 3647 sockets

Narrow ILM LGA 3647 cooler for 1U servers

The Dynatron B3 is a new low-profile air cooler built for Intel LGA 3647 sockets using the narrow ILM mounting pattern. It fits inside a 1U chassis with a maximum cooler height of 28 mm and handles processors rated up to 165 W TDP. The copper 1100 skived-fin heatsink and horizontal 80 mm blower fan target dense rack deployments where vertical clearance is fixed.

Upgrade from stock narrow-ILM heatsinks

Stock coolers supplied with narrow ILM Xeon processors often max out at lower TDPs and higher acoustic levels. The B3 replaces them when the workload sustains 165 W in a 1U form factor and the system can drive a 4-pin PWM fan. The jump is worth it when the existing cooler throttles under sustained load or when fan noise at full speed exceeds the 57.1 dBA ceiling of this unit.

Limited by 1U height and single 80 mm PWM blower

The 28 mm Z-height cap rules out taller fin stacks or larger fans, so thermal capacity tops out at the rated 165 W. Airflow peaks at 21.0 CFM with 70.9 mm-H₂O pressure at 7000 RPM, but noise reaches 57.1 dBA at that duty cycle. Systems without PWM fan headers or with restricted front-to-rear airflow paths cannot exploit the full performance envelope.

How it compares

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

Price $43.99
Pricier than about 87% of the 1,559 comparable items (median $19.99).
Fan size 80 mm
Typical for this category: the median of 812 items is 80 mm.

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Specifications

Product
Brand nameDynatron
Model nameB3
Product typeFan & Heatsinks
Performance
Rotational speedAt Duty Cycle 20%: 1000 +/- 200 RPM
At Duty Cycle 50%: 4000 +/- 10% RPM
At Duty Cycle 100%: 7000 +/- 10% RPM
Airflow rateAt Duty Cycle 20%: 3.0 CFM
At Duty Cycle 50%: 12.0 CFM
At Duty Cycle 100%: 21.0 CFM
Power
Power input connectorPin1- (-)
Pin2- (+)
Pin3- (Tachometer/Signal output)
Pin4- (PWM)
Size & build
Fan size80 mm
Bearing design2 Ball Bearing
Cooler materialCopper 1100 with Skived Fins
Fan mountingHorizontal
Heatsink dimensions107 × 80.5 × 28 mm
Product weight460g
Shipping weight0.62 kg
Package size132 × 109 × 69 mm
Compatibility
Supported CPU socketsIntel LGA 3647
CPU cooler height limit28 mm
Environment & compliance
Operating noiseAt Duty Cycle 20%: 16 dBA
At Duty Cycle 50%: 44.9 dBA
At Duty Cycle 100%: 57.1 dBA

Questions about this item

Will the 28 mm height and 107 mm length fit my 1U server chassis?

The cooler stands 28 mm tall and the heatsink measures 107 mm long by 80.5 mm wide, matching the 1U form factor for narrow ILM LGA 3647 sockets.

How do I mount this on the narrow ILM socket without bending the copper fins?

Align the four captive screws with the narrow ILM mounting holes, lower the copper skived heatsink evenly, then tighten each screw a half-turn at a time in a cross pattern to 0.6 Nm.

When should I replace the 2 ball bearing fan?

The dual ball bearing fan is rated for continuous 12 V operation; plan replacement if RPM drops below 4000 at 50 % duty cycle or noise exceeds 57 dBA at full speed.

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