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Silver aluminum radial-fin heatsink with copper core and black 77 mm fan, 62 mm tall

Dynatron

Dynatron K785 CPU cooler 77 mm fan 62 mm height

SKU CH-W72R-SRZ5R MPN K785

Low-profile 62 mm cooler with 77 mm dual-ball-bearing PWM fan fits Intel LGA 1156, 1155 and 1151 sockets

  • Fan size77 mm
  • Supported CPU socketsIntel LGA 1156 / 1155 / 1151
  • Bearing design2 Ball
  • Rotational speedAt Duty Cycle 0-20%: 1,000 RPM At Duty Cycle 50%: 2,500 RPM
  • Airflow rateAt Duty Cycle 0-20%: 10.12 CFM At Duty Cycle 50%: 25.3 CFM A
  • Operating noiseAt Duty Cycle 0-20%: 13.14 dBA At Duty Cycle 50%: 33.04 dBA
  • Low-noise operation at 13.14 dBA during light loads
  • PWM fan scales to 4500 RPM for heavy workloads
  • Copper-inserted aluminium heatsink improves heat transfer
  • 62 mm height fits space-constrained chassis builds
  • 4-pin PWM connector enables precise motherboard fan control

Low-Profile Intel LGA 115x Cooler

The Dynatron K785 is a 62 mm tall air cooler with a 77 mm two-ball-bearing fan. It fits Intel LGA 1156, 1155 and 1151 sockets and supports listed Core i3, i5, i7 and Xeon 3400 series processors. The aluminium radial fin stack includes a copper insert and weighs 500 g.

Socket And Clearance Check

Verify that your motherboard uses one of the three supported LGA sockets before ordering. Ensure the case allows at least 62 mm of cooler height and that the 90 mm square heatsink footprint clears surrounding components. The four-pin PWM header on the board is required for fan control.

PWM Fan And Mounting Hardware

The bundled fan runs from 1000 RPM at 0-20 % duty cycle to 4500 RPM at 100 % duty cycle, delivering 10.12 to 45.56 CFM with noise from 13.14 to 45.8 dBA. Horizontal mounting clips secure the fan to the heatsink. No additional software or accessories are included.

How it compares

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

Price $19.99
Typical for this category: the median of 1,559 items is $19.99.
Fan size 77 mm
Typical for this category: the median of 812 items is 80 mm.

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Specifications

Product
Brand nameDynatron
Model nameK785
Product typeFan & Heatsinks
Performance
Rotational speedAt Duty Cycle 0-20%: 1,000 RPM
At Duty Cycle 50%: 2,500 RPM
At Duty Cycle 100%: 4,500 RPM
Airflow rateAt Duty Cycle 0-20%: 10.12 CFM
At Duty Cycle 50%: 25.3 CFM
At Duty Cycle 100%: 45.56 CFM
Power
Power input connector4 Pin PWM
Size & build
Fan size77 mm
Bearing design2 Ball
Cooler materialAluminum Extruded Radial Fin Heatsink with Copper Inserted
Fan mountingHorizontal
Heatsink dimensions90.0 × 90.0 × 62.0 mm
Product weight500g
Shipping weight0.54 kg
Package size114 × 112 × 94 mm
Compatibility
Supported CPU socketsIntel LGA 1156 / 1155 / 1151
CPU cooler height limit62 mm
Environment & compliance
Operating noiseAt Duty Cycle 0-20%: 13.14 dBA
At Duty Cycle 50%: 33.04 dBA
At Duty Cycle 100%: 45.8 dBA

Questions about this item

Does the Dynatron K785 come with mounting hardware for LGA 1151, or must I buy a separate bracket?

The cooler supports Intel LGA 1156, 1155 and 1151 sockets; the mounting hardware for those sockets is included in the box.

Which fan-speed setting should I choose for a quiet office PC versus a compact workstation?

At the 0-20 % duty cycle the fan runs at 1000 RPM and 13.14 dBA for quiet operation; at 100 % duty cycle it reaches 4500 RPM and 45.8 dBA for maximum cooling in a 62 mm tall chassis.

Will the 45.56 CFM airflow at full speed handle a Core i7-870 in a 62 mm high case?

Yes, the aluminium radial fin heatsink with copper insert and 45.56 CFM at 4500 RPM is rated for the listed Core i7-870 and fits within the 62 mm height limit.

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