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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

  • TypeFan & Heatsinks
  • Fan Size77mm
  • CPU Socket CompatibilityIntel LGA 1156 / 1155 / 1151
  • Bearing Type2 Ball
  • RPMAt Duty Cycle 0-20%: 1000 RPM At Duty Cycle 50%: 2500 RPM At
  • Air FlowAt Duty Cycle 0-20%: 10.12 CFM At Duty Cycle 50%: 25.30 CFM
  • 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.

Highlights

  • 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

Specifications

BrandDynatron
ModelK785
TypeFan & Heatsinks
Fan Size77mm
CPU Socket CompatibilityIntel LGA 1156 / 1155 / 1151
Bearing Type2 Ball
RPMAt Duty Cycle 0-20%: 1000 RPM
At Duty Cycle 50%: 2500 RPM
At Duty Cycle 100%: 4500 RPM
Air FlowAt Duty Cycle 0-20%: 10.12 CFM
At Duty Cycle 50%: 25.30 CFM
At Duty Cycle 100%: 45.56 CFM
Noise LevelAt Duty Cycle 0-20%: 13.14 dBA
At Duty Cycle 50%: 33.04 dBA
At Duty Cycle 100%: 45.8 dBA
Power Connector4 Pin PWM
Heatsink MaterialAluminum Extruded Radial Fin Heatsink with Copper Inserted
Fan Mounting Types to HeatsinkHorizontal
Max CPU Cooler Height62 mm
Fan Dimensions77 x 77 x 20 mm
Heatsink Dimensions90.0 x 90.0 x 62.0 mm
Weight500g
FeaturesCPU Support: Intel Core i3 i3-530 & i3-540, Core i5 i5-650, i5-650, i5-660, i5-661 i5-670 & I5-750; Xeon Processor 3400 Series; Core i7 Processors, I7-870 & I7-860
Shipping weight0.54 kg
Package size114 × 112 × 94 mm

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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