Cooler Master

Cooler Master GeminII M4 - CPU Cooler with 4 Direct Contact Heat Pipes (RR-GMM4-16PK-R2)

Name: Cooler Master GeminII M4 - CPU Cooler with 4 Direct Contact Heat Pipes (RR-GMM4-16PK-R2)
Brand: Cooler Master
SKU: B0080ATR2Y

Bottom line: The Cooler Master GeminII M4: Ultra-low 59mm profile fits Mini-ITX, HTPC and slim desktop builds; main trade-off: 17.4-58.4 CFM airflow limits heavy overclocking or high-TDP chips.

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-19

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ Ultra-low 59mm profile fits Mini-ITX, HTPC and slim desktop builds
✓ 4 direct-contact heat pipes for solid heat conduction in a compact body
✓ PWM 4-pin fan spins 500-1600rpm with a quiet 8-30 dBA range
✓ 40,000-hour sleeve bearing rated lifespan

Cons

✗ 17.4-58.4 CFM airflow limits heavy overclocking or high-TDP chips
✗ Sleeve bearing wears faster than fluid or ball bearings over time
✗ Single low-profile fan, no push-pull or larger-fan upgrade path
✗ Noise climbs toward 30 dBA at full 1600rpm load

Manufacturer description

GeminII M4 is a super low profile CPU cooler (59mm/2. 3 Inch height) designed for a system with limited space, such as Mini ITX, HTPC, or any small desktop. With its 4 direct Contact heat pipes and unique Heat pipe layout, GeminII M4 not only keeps compact size, but provides amazing cooling performance.

SpecPicks Verdict

SpecPicks scored Cooler Master GeminII M4 using a rating × review-volume × price-fit model applied to published specs and reviews across the retro cpu coolers & fans category. Cooler Master's retro cpu coolers & fans lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for retro cpu coolers & fans of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

Speed: 500 1600rpm (PWM) 10 percent
Bearing Type: Long Life Sleeve Bearing
Life Expectancy: 40,000 hours
Noise Level: 8 30 dBA
Airflow: 17.4 58.4 CFM 10 percent
Connector: 4 Pin

Full Specifications

Brand	Cooler Master
Model	RR-GMM4-16PK-R2
Speed	500 1600rpm (PWM) 10 percent
Airflow	17.4 58.4 CFM 10 percent
Voltage	12 volts
Wattage	2.4 watts
Material	Aluminum
Connector	4 Pin
Dimensions	5.4 x 4.8 x 2.3 inch
Unit Count	1 Count
Noise Level	30 db
Part Number	RR-GMM4-16PK-R2
Bearing Type	Long Life Sleeve Bearing
Material Type	Aluminum
Cooling Method	Thermal
Life Expectancy	40,000 hours
Number of Items	1
Air Flow Capacity	58.4 cfm
Compatible Devices	Desktop
Included Components	Processor cooler

Ready to buy?

Cooler Master GeminII M4 - CPU Cooler with 4 Direct Contact Heat Pipes (RR-GMM4-16PK-R2) is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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