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ARCTIC S4028-6K (5 Pack) - 40x40x28 mm Server Fans, 250–6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan - Black
ARCTIC

ARCTIC S4028-6K (5 Pack)

Bottom line: The ARCTIC S4028-6K: Dual ball bearings resist heat and dust in cramped 1U racks; main trade-off: 6000 RPM top speed is loud enough to be audible across a room.

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By , Founder & Editor-in-Chief · Listing data updated

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.

Pros & Cons

Pros

  • ✓ Dual ball bearings resist heat and dust in cramped 1U racks
  • ✓ Wide 250-6000 RPM PWM range trades noise for airflow on demand
  • ✓ 4.2 mm/H2O static pressure pushes air through dense radiator fins
  • ✓ 40 cm cable reaches distant headers in deep rack chassis

Cons

  • ✗ 6000 RPM top speed is loud enough to be audible across a room
  • ✗ 12.06 m3/h airflow is modest, typical of the 40 mm format
  • ✗ 28 mm thickness will not fit slim 40x40x10 or 20 mm mounts
  • ✗ Ball bearings hum more at idle than fluid-dynamic alternatives

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SpecPicks Verdict

SpecPicks scored ARCTIC S4028-6K using a rating × review-volume × price-fit model applied to published specs and reviews across the retro cpu coolers & fans category. ARCTIC'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

  • The S4028-6K's impeller is held in place by two ball bearings, making it both especially durable as well as less sensitive to external influences such as heat and dust
  • The S4028-6K has a particularly wide speed range that can be regulated via PWM and voltage. With its 6000 RPM max it offers a well-balanced ratio between cooling power and noise
  • With a static pressure of 4.2 mm/H2O and a maximum airflow of 12.06 m³/h, the S4028-6K is a true all-rounder and is suitable as both radiator and case fan
  • The S4028-6K fits in 1U server cases as a replacement fan for routers, switches, and NAS. It can also be used for other products such as DVRs, Mini PCs, HTPCs, hard disk enclosures and 3D printers
  • The fan has a standard 4-pin fan connector and can also be connected and controlled on 2-pin or 3-pin headers, while its 40 cm cable allows enough flexibility in positioning

Full Specifications

BrandARCTIC
ColorBlack
ModelACFAN00273A
Voltage12 volts
Wattage1.2 watts
MaterialPolycarbonate
Dimensions40x40x28 mm
Unit Count5 Count
Noise Level38 db
Part NumberACFAN00273A
Material TypePolycarbonate
Cooling MethodAir
Number of Items5
Air Flow Capacity7.1 cfm
Compatible DevicesPrinter, Server
Power Connector Type2510 4-Pin Fan-Connector
Maximum Rotational Speed6000 rpm
Item Dimensions L x W x H1.57"L x 1.1"W x 1.57"H
Full listing titleARCTIC S4028-6K (5 Pack) - 40x40x28 mm Server Fans, 250–6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan - Black

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ARCTIC S4028-6K (5 Pack) - 40x40x28 mm Server Fans, 250–6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan - Black is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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ARCTIC S4028-6K (5 Pack) - 40x40x28 mm Server Fans, 250–6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan - Black
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