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Compact copper heatsink with horizontal 70mm blower fan and AM4 mounting hardware

Dynatron

Dynatron A18 CPU cooler AM4 70mm 95W

SKU CH-D645-QKJ84 MPN A18

A 70 mm PWM blower cooler with copper skived fins, 28 mm height and Shin-Etsu 7762 thermal grease pre-printed for AM4 CPUs up to 95 W

  • Fan size70 mm
  • Supported CPU socketsAMD Socket AM4
  • Bearing design2 Ball
  • Rotational speedAt Duty Cycle 20%: 1,100 RPM +/- 200 RPM At Duty Cycle 50%:
  • Airflow rateAt Duty Cycle 20%: 2.5 CFM At Duty Cycle 50%: 5.8 CFM At Dut
  • Operating noiseAt Duty Cycle 20%: 19.1 dBA At Duty Cycle 50%: 34.2 dBA At D
  • Low-noise operation at 19.1 dBA with 20 % PWM duty
  • High airflow of 14.3 CFM at full 6000 RPM speed
  • Copper 1100 skived-fin heatsink conducts heat efficiently
  • Pre-printed Shin-Etsu 7762 thermal grease saves installation time
  • Fits 1U chassis with 28 mm maximum cooler height

Socket AM4 blower cooler for 1U servers

The Dynatron A18 is a low-profile air cooler built for AMD Socket AM4 processors with a thermal design power up to 95 watts. Its 70 mm blower fan mounts horizontally over a copper heatsink, directing airflow parallel to the system’s front-to-rear path. The assembly stands just 28 mm tall and weighs approximately 450 grams, fitting the tight vertical space of 1U rackmount chassis. Shin-Etsu 7762 thermal grease is pre-printed on the base for immediate installation.

Copper skived-fin heatsink with captive mounting

The heatsink uses Copper 1100 with skived fins and an alloy frame that doubles as the blower housing. A captive mounting system secures the cooler to the included backing plate without loose screws, reducing assembly time in dense server builds. The four-pin PWM connector supplies 12 volts and reports fan speed via a tachometer signal, allowing the motherboard to modulate fan speed from 20 to 100 percent duty cycle. Two-ball bearings support the 70 mm impeller for continuous operation.

Airflow and acoustic limits at 95 W TDP

At full PWM duty the fan spins at 6000 RPM, moving 14.3 CFM while producing 53.8 dBA — a level suited to server rooms rather than quiet workspaces. At 50 percent duty the speed drops to 2600 RPM with 5.8 CFM and 34.2 dBA, while the 20 percent setting yields 1100 RPM, 2.5 CFM and 19.1 dBA for idle or light loads. The cooler’s 95 watt rating defines its practical ceiling; processors exceeding that envelope will require a higher-capacity thermal solution.

How it compares

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

Price $38.99
Pricier than about 84% of the 1,559 comparable items (median $19.99).
Fan size 70 mm
Lower than about 55% of the 812 comparable items (median 80 mm).

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Specifications

Product
Brand nameDynatron
Model nameA18
Product typeFan & Heatsinks
Performance
Rotational speedAt Duty Cycle 20%: 1,100 RPM +/- 200 RPM
At Duty Cycle 50%: 2,600 RPM +/- 10% RPM
At Duty Cycle 100%: 6,000 RPM +/- 10% RPM
Airflow rateAt Duty Cycle 20%: 2.5 CFM
At Duty Cycle 50%: 5.8 CFM
At Duty Cycle 100%: 14.3 CFM
Power
Power input connectorPin1- (-)
Pin2- (+)
Pin3- (Techometer/Signal output)
Pin4- (PWM)
Size & build
Fan size70 mm
Bearing design2 Ball
Cooler materialCopper
Fan mountingHorizontal
Heatsink dimensions106.17 × 76.2 × 27.43 mm
Product weight450g +/- 5g
Shipping weight0.63 kg
Package size119 × 99 × 51 mm
Compatibility
Supported CPU socketsAMD Socket AM4
CPU cooler height limit28 mm
Environment & compliance
Operating noiseAt Duty Cycle 20%: 19.1 dBA
At Duty Cycle 50%: 34.2 dBA
At Duty Cycle 100%: 53.8 dBA

Questions about this item

Does the 4-pin PWM connector on the Dynatron A18 follow the standard pinout for AM4 motherboards?

Yes, the cooler uses a 4-pin connector with Pin 1 ground, Pin 2 12 V, Pin 3 tachometer signal and Pin 4 PWM control, matching the AM4 motherboard header.

Will the 28 mm overall height and 106.17 x 76.20 mm heatsink footprint fit inside a 1U server chassis?

The 28 mm height meets the 1U limit, and the heatsink footprint of 106.17 x 76.20 mm clears standard 1U keep-out zones.

How is the Shin-Etsu 7762 thermal grease applied, and what mounting mistake should I avoid?

The grease is pre-printed on the copper base; do not add extra paste, and secure the captive screws evenly in a cross pattern using the included backing plate.

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