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Square aluminium radial-fin heatsink with copper insert, horizontal 92 mm ball-bearing fan, 73 mm tall

Dynatron

Dynatron K985 92 mm CPU cooler, Intel LGA 1156/1155/1151, ball bearing

SKU CH-Y60Y-7V7H2 MPN K985

A 92 mm PWM cooler with ball-bearing fan and copper-insert aluminium heatsink fits Intel LGA 1156, 1155 and 1151 sockets in a 73 mm height

  • Fan size92 mm
  • Supported CPU socketsIntel LGA 1156 / 1155 / 1151
  • Bearing designBall
  • Rotational speedAt Duty Cycle 0-20%: 700 RPM At Duty Cycle 50%: 1,400 RPM At
  • Airflow rateAt Duty Cycle 0-20%: 14.98 CFM At Duty Cycle 50%: 29.9 CFM A
  • Operating noiseAt Duty Cycle 0-20%: 14.7 dBA At Duty Cycle 50%: 18.5 dBA At
  • Low noise at light loads with 14.70 dBA at 0-20% duty cycle
  • Strong airflow when needed reaching 46.96 CFM at full speed
  • PWM control enables automatic speed adjustment via 4-pin connector
  • Compact 73 mm height fits tight chassis spaces
  • Ball bearing fan built for long service life

Socket compatibility and target use

The Dynatron K985 is a 92 mm air cooler designed for Intel LGA 1156, 1155 and 1151 sockets. It supports Core i3 530 and 540, Core i5 650, 660, 661, 670 and 750, Core i7 860 and 870, plus Xeon 3400 series processors. Builders upgrading or repairing these platforms can use this cooler as a direct replacement.

Thermals noise and power draw

A 4 pin PWM fan runs at 700 RPM and 14.70 dBA at the 0-20 % duty cycle, moving 14.98 CFM. At 50 % duty the speed rises to 1400 RPM, airflow to 29.90 CFM and noise to 18.50 dBA. Full 100 % duty reaches 2500 RPM, 46.96 CFM and 29.85 dBA. The aluminium radial fin heatsink with copper inserted base dissipates heat horizontally within a 73 mm height limit.

Included mounting and software impact

The package provides the mounting hardware required for the listed Intel sockets and the 92 x 92 x 25 mm fan pre-attached to the 106.0 x 106.0 x 72.6 mm heatsink. No additional software, lighting controllers or accessory brackets are supplied. The ball bearing fan and PWM connector work with standard motherboard fan headers without extra configuration.

How it compares

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

Price $30.99
Pricier than about 80% of the 1,559 comparable items (median $19.99).
Fan size 92 mm
Higher than about 70% of the 812 comparable items (median 80 mm).

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Specifications

Product
Brand nameDynatron
Model nameK985
Product typeFan & Heatsinks
Performance
Rotational speedAt Duty Cycle 0-20%: 700 RPM
At Duty Cycle 50%: 1,400 RPM
At Duty Cycle 100%: 2,500 RPM
Airflow rateAt Duty Cycle 0-20%: 14.98 CFM
At Duty Cycle 50%: 29.9 CFM
At Duty Cycle 100%: 46.96 CFM
Power
Power input connector4 Pin PWM
Size & build
Fan size92 mm
Bearing designBall
Cooler materialAluminum Radial Fin Heatsink with Copper Inserted
Fan mountingHorizontal
Heatsink dimensions106.0 × 106.0 × 72.6 mm
Product weight500g
Shipping weight0.58 kg
Package size117 × 109 × 89 mm
Compatibility
Supported CPU socketsIntel LGA 1156 / 1155 / 1151
CPU cooler height limit73 mm
Environment & compliance
Operating noiseAt Duty Cycle 0-20%: 14.7 dBA
At Duty Cycle 50%: 18.5 dBA
At Duty Cycle 100%: 29.85 dBA

Questions about this item

How do I mount the Dynatron K985 on an LGA 1151 socket and which step is often missed?

The cooler uses Intel push-pin brackets for LGA 1156, 1155 and 1151; the step people skip is pushing each pin until it clicks and then twisting the cap to lock it, otherwise the heatsink sits loose and temperatures rise.

What maintenance will the 92 mm ball-bearing fan need over time?

Ball bearings run without lubrication, so the only upkeep is blowing dust from the aluminum radial fins and the 92 x 92 x 25 mm fan blades every few months to keep airflow near the 46.96 CFM maximum.

At what point does the 4-pin PWM fan hit its thermal limit during a long render?

At 100 % duty cycle the fan spins at 2500 RPM and moves 46.96 CFM at 29.85 dBA; beyond that the heatsink cannot shed more heat, so CPU temperatures will climb unless the workload drops.

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