Coolerguys Fan Power Supply 100-240v AC to 12v DC 1A Output 3pin or 4pin PWM Connector AC DC Adapter
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AI Verdict
This is a dead-simple, reliable wall adapter for powering spare PC fans in DIY projects, AV cabinets, or greenhouses, provided you don't need built-in speed control.
It works perfectly if you just want to plug a spare Noctua or Corsair fan into a wall outlet to cool a router or terrarium. If you need to power a massive array of fans or want out-of-the-box speed control, this barebones adapter falls short.
If you need to run more than 3 fans or want adjustable speeds, upgrade to a 2A (24W) power supply with an inline voltage controller.
Regret Score™
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Pros
- Plugs directly into standard 3-pin or 4-pin PC fans without needing a molex adapter
- Compact brick design doesn't block adjacent outlets on a power strip
- 5-foot cable gives you enough reach for AV cabinets or terrarium setups
- Runs cool and maintains a stable 12V output even under continuous 24/7 loads
Cons
- Max output is strictly 1A (12W), limiting you to 2-3 standard fans via a splitter
- No built-in speed controller means fans run at 100% RPM constantly
- The locking tab on the 2510 connector is extremely tight and difficult to unplug
- Lacks an inline power switch, forcing you to pull the plug to turn fans off
Dimension Scores
Delivers a stable 12V/1A without overheating, but the 1A cap restricts larger projects.
The power brick itself is completely silent with no reported coil whine.
Solid plastic housing and a secure, albeit overly tight, 2510 connector.
The 5-foot cable is adequate, but the lack of an inline switch means you have to yank it from the wall to turn it off.
Best For
- Cooling AV receivers or home theater amps with repurposed 120mm PC fans
- Adding exhaust fans to indoor IKEA greenhouse cabinets or terrariums
- DIY soldering fume extractors using spare 92mm or 120mm fans
Not Recommended For
- Daisy-chaining 4+ high-RPM fans that exceed the 1A total draw limit
- Silent setups where you need to dial down fan speeds without buying extra parts
Watch Out For
- Fans run at 100% speed — despite having a 4-pin PWM connector, this brick only supplies power, so you need a separate inline controller to lower the RPM.
- The 1A limit is a hard ceiling — Coolerguys recommends keeping continuous draw under 0.75A, so check your fan's sticker before using a 3-way splitter.
- The locking tab on the connector is notoriously stiff — you need a small flathead screwdriver to pry it loose if you ever need to swap fans.
Full Specifications
| ASIN | B084JG4619 |
| Brand | coolerguys |
| Wattage | 12 watts |
| Amperage | 1 Amps |
| Item Weight | 2.11 ounces |
| Manufacturer | Coolerguys |
| Input Voltage | 240 Volts |
| Connector Type | 3-pin or 4-pin PWM |
| Output Current | 1 Amps |
| Number of Items | 1 |
| Special Feature | Short Circuit Protection |
| Item model number | 840556072294 |
| Compatible Devices | PC |
| Package Dimensions | 3.07 x 2.44 x 1.85 inches |
| Included Components | 2 x USB Cable |
What Buyers Say
The biggest surprise with this adapter is how many people use it for non-PC projects like indoor greenhouses, AV cabinets, and 3D printer enclosures. People love that it eliminates the need for clunky Molex adapters by plugging straight into standard PC fans. The most frequent warning is about the 1A limit; trying to run four high-speed fans quickly overloads it. Another common quirk is the connector's locking tab, which grips the fan cable so tightly that it feels glued on. If you just need to spin a couple of spare fans at full blast, it is a bulletproof solution.
“Plugged it into a spare 120mm fan to cool my receiver and it worked instantly, but man that connector is tight and I wish it had an on/off switch.”
Common Praise
- Plugs directly into standard PC fans without needing splicing or adapters
- Brick stays cool to the touch even after weeks of continuous use
- Compact plug design doesn't hog space on surge protectors
- Revives old, unused PC fans for cheap DIY cooling projects
Common Complaints
- Connector tab is incredibly stiff and hard to disconnect
- No inline power switch forces you to unplug it from the wall to turn it off
- Fans run at maximum RPM, which gets loud without a separate controller
- 1A limit restricts you to 2 or 3 standard fans max
Ownership Tips
- The 5-foot cable is often just a few inches too short for routing cleanly behind tall AV racks
- If you use a splitter, the fans might spin slightly slower than their rated max RPM due to voltage drop
- The lack of a power switch gets annoying fast if you don't plug it into a smart plug or switched power strip
Frequently Asked Questions
Will this control the speed of my 4-pin PWM fan?
No. It only provides 12V power, so your fan runs at 100% speed. You need to buy a separate inline fan speed controller if you want it quieter.
Can I use a splitter to power multiple fans from this one plug?
Yes, but you must check the amp rating on your fans. The total combined draw cannot exceed 1A, and ideally stays under 0.75A for 24/7 use.
Does it work with older 3-pin fans?
Yes. The connector is a 2510 (3+1) design, meaning it physically accepts both 3-pin and 4-pin fan cables perfectly.
Is the power brick safe to leave plugged in 24/7?
Yes. People report running these continuously for months in home servers and greenhouses without the brick getting hot.
Can I use this outdoors for a patio greenhouse?
No. This adapter has no IP rating or weatherproofing, so it must be kept dry and indoors.
Buying Guide
When buying a wall adapter for PC fans, the only number that really matters is the Amperage (A). This unit provides 1A. Look at the sticker on the back of your fan — it will say something like '0.3A'. Add up the numbers for all the fans you want to connect; if it goes over 1A, this power supply will fail. Remember that PC fans are designed to be controlled by a motherboard. Since a wall outlet can't send those control signals, your fans run at maximum speed and maximum noise unless you buy a separate speed dial.
1A Output
Think of voltage as the water pressure and amperage as the pipe size. 1A is a small pipe, meaning it only supplies enough juice for 1 to 3 standard fans before it gets overwhelmed.
3-pin/4-pin PWM Connector
This is the exact shape of the plug on the end of a computer fan. Having this built-in means you avoid cutting wires or buying messy adapters to make it work.
100-240V AC Input
This means it plugs into a standard wall outlet anywhere in the world, taking the high-voltage wall power and stepping it down to the safe 12V your fans need.
Alternatives
If you need to run more than three fans, look for a 12V 2A or 5A power supply. If you want to adjust the noise, search for an adapter that includes a manual rotary speed controller.
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