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Compact CPU cooler with copper base, aluminium fin stack and 77mm two-ball bearing fan

Dynatron

Dynatron K555 77mm 2 Ball CPU cooler 4-pin PWM 460g

SKU CH-7WBS-EBQW6 MPN K555

A 77mm dual-ball-bearing PWM fan on a copper-base, aluminium-fin heatsink with embedded heatpipes cools supported Intel Core i3, i5.

  • Fan size77 mm
  • Bearing design2 Ball
  • Rotational speedAt Duty Cycle 0 to 20%: 1,000 RPM At Duty Cycle 50%: 2,500 R
  • Airflow rateAt Duty Cycle 0 to 20%: 10.12 CFM At Duty Cycle 50%: 25.3 CF
  • Operating noiseAt Duty Cycle 0 to 20%: 13.14 dBA At Duty Cycle 50%: 33.04 d
  • Power input connector4 Pin PWM
  • Compact 77 mm fan fits tight builds while moving up to 45.56 CFM at full speed
  • Dual ball bearing rated for long life across the 1000 to 4500 RPM range
  • Copper base with embedded heatpipes draws heat quickly from supported Intel CPUs
  • 4-pin PWM control lets the motherboard balance airflow and noise automatically
  • Lightweight 460 g assembly keeps motherboard stress low in small-form-factor systems

Target Platforms

The Dynatron K555 is a 77mm air cooler built for Intel Core i3, i5 and i7 processors from the first Core generation plus Xeon 3400 series chips. It fits sockets used by models such as the i3-530, i5-750 and i7-870. Builders working on newer platforms cannot use this cooler.

Deciding Specification

The 4-pin PWM fan spins from 1000 RPM at low duty cycle to 4500 RPM at full speed, delivering 10.12 to 45.56 CFM with noise between 13.14 and 45.8 dBA. That airflow range decides whether the cooler can handle the thermal load of the supported CPUs.

Bundled Hardware

A copper base with embedded heatpipes and aluminium fins weighs 460g and measures 94.0 by 87.5 by 67.7mm. The 77 by 77 by 20mm two-ball-bearing fan attaches directly to the heatsink. No extra brackets, paste or software are included.

How it compares

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

Price $28.99
Pricier than about 77% of the 1,559 comparable items (median $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 nameK555
Product typeFan & Heatsinks
Performance
Rotational speedAt Duty Cycle 0 to 20%: 1,000 RPM
At Duty Cycle 50%: 2,500 RPM
At Duty Cycle 100%: 4,500 RPM
Airflow rateAt Duty Cycle 0 to 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 materialCopper Base & Aluminum Fins with Heatpipes embedded
Heatsink dimensions94.0 × 87.5 × 67.7 mm
Product weight460g ± 5g
Shipping weight0.54 kg
Package size108 × 108 × 64 mm
Environment & compliance
Operating noiseAt Duty Cycle 0 to 20%: 13.14 dBA
At Duty Cycle 50%: 33.04 dBA
At Duty Cycle 100%: 45.8 dBA

Questions about this item

What does the 45.56 CFM airflow at full speed mean for actual CPU temperatures?

At 100 percent duty cycle the fan moves 45.56 CFM at 4500 RPM, producing 45.8 dBA; the copper base and aluminium fins with embedded heatpipes transfer that airflow into heat dissipation for the supported Intel sockets.

How does the 4-pin PWM connector control the fan between the listed duty cycles?

The 4-pin PWM header lets the motherboard vary the duty cycle: 0 to 20 percent runs the fan at 1000 RPM and 10.12 CFM, 50 percent gives 2500 RPM and 25.30 CFM, and 100 percent reaches 4500 RPM and 45.56 CFM.

Will the 94.0 by 87.5 by 67.7 mm heatsink clear my motherboard components and case side panel?

The heatsink measures 94.0 mm wide, 87.5 mm deep and 67.7 mm tall; combined with the 77 x 77 x 20 mm fan the total assembly weighs 460 g, so check your case CPU-cooler height limit and motherboard keep-out zones before fitting.

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