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CHA_FAN On Your Motherboard — Everything You Need to Know



Motherboards these days come in all shapes and sizes.

Form factors, chipsets, slots… And: all sorts of (fan) headers.

Well, many are asking us about a motherboard fan header that is labeled “CHA_FAN”.

So what is CHA_FAN and what is it used for?

Let’s find out!

What is CHA_FAN?

CHA FAN stands for chassis fan and is used for powering additional fans in your system through either 4-pin or 3-pin connectors.

Chassis is another word for your “PC Case”, and the CHA_FAN header, therefore, is mostly used to power and control your PC Case’s additional fans.

CHA_FAN Headers on an Asus B550 Motherboard

Depending on the motherboard you’re using, you will have anywhere between one and six CHA_FAN headers alongside CPU_FAN and potentially a CPU_OPT header too.

3-pin CHA FAN headers don’t have the ability to accurately adjust their RPM (rotations per minute). They typically run at maximum speed, though can slightly lower it down by lowering the voltage.

4-pin CHA FAN headers have pulse width modulation on the fourth wire which allows direct control over the RPM.

RPM can be controlled either through the BIOS, dedicated software, or the operating system. The adjustments are based on internal temperature data, either average system temperature or CPU temperature.

In the image below you can see how individual fans can be controlled by adjusting their fan curve and choosing the source temperature sensor.

In this MSI BIOS, the CHA_FAN1 Header would be controlled through the “System 1” tab, CHA_FAN2 Header through “System 2” and so on depending on where your case fans are plugged in to.

Some Motherboard manufacturers use the name “SYS_FAN” instead of CHA_FAN, but they are essentially the same thing.

Custom fan curve in an MSI UEFI BIOS – Source: MSI

What Other Types of PC Fan Headers Exist?

Of course, CHA FANS are only a part of the story! Motherboards have several other fan headers that serve different purposes.

Here’s a closer look:


CPU FAN, as its name suggests, is used for powering and controlling your processors’ fan.

MSI B450 TOMAHAWK Motherboard

CPU FAN features a 4-pin connector with PWM so that the connected fan can easily be adjusted according to the constantly-changing CPU temperatures.


CPU OPT stands for CPU Optional and is used for powering up additional CPU fans. For those of you who are wondering if there’s a tangible difference between CPU FAN and CPU OPT, there is!

CPU FAN is the default fan header for your CPU and if not connected (depending on your motherboard), it might even prevent your system from booting.

CPU OPT, on the other hand, serves as a secondary CPU FAN header but won’t prevent booting nor it will give you any error messages. So, in essence, CPU FAN is a must, CPU OPT is not (hence the name optional).


Some motherboard manufacturers use SYS FAN labels instead of CHA FAN.

MSI B450 TOMAHAWK Motherboard

These are essentially the same exact thing – they’re used for system/chassis fans and come as either 3-pin or 4-pin variants.


Long story short – CHA FAN headers are the same as SYS FAN headers. They are in charge of powering system/chassis/case fans and typically come in 3-pin or 4-pin variants.


What is a CHA FAN header?

CHA FAN header, often called SYS FAN header, is a connector on your motherboard used for powering and controlling your system/chassis/case fans.

Is CHA FAN the same as SYS FAN?

Yes, CHA FAN is the same as SYS FAN.

They’re both used for powering additional fans to help with your system’s airflow, and they can both come as either 3-pin or 4-pin variants.

Is CPU FAN the same as CPU OPT?

No, CPU FAN is not the same as CPU OPT.

In most systems, you need to connect a fan to the CPU FAN header, otherwise, your system might give you error codes and, in some cases, might not even boot at all.

As for CPU OPT, it’s an (optional) connector meant to power additional CPU fans you might have. You won’t experience any errors if there’s nothing connected to it.

Over to You

Does your motherboard have CHA_FAN or does it use a different label?

Tell us more in the comments below or on our forum with whatever issues or questions you may have on your motherboard’s fan labels.

CGDirector is Reader-supported. When you buy through our links, we may earn an affiliate commission.

What Is The Chassis Fan («CHA_FAN») Connector? What Are «Chassis» Fans?

Are you thinking about building your own computer? Do you want to customize your existing computer to meet your needs? If so, you are probably thinking about the performance of the computer. You may want to handle gaming, or you may be looking for a powerful computer that you can use to quickly trade stocks on the market.

At the same time, you need to make sure your computer will work well once you are done making your modifications or building it from scratch. That is where case fans can be important. Also called chassis fans, what are these fans, and what do they do? Are they the same as CPU fans? And how do they then plug into the motherboard itself? We answer these questions, and more, below.

Chassis fan infographic they sit INSIDE the case connector to a 3 or 4 pin point and work similar to CPU fans (click to enlarge)

What Are Case Fans?

First, a case fan can go by many names. They might also be called chassis fans or system fans. They are located inside the case of the computer itself, which is why they are called case fans.

Quite dusty case fans

If you take a look at the front or back of your computer case, you should see a few fans spinning. Alternatively, when you turn on the computer, you may hear something start to spin. You are hearing the case fans doing their jobs.

The video clip below shows the chassis fans too, along with showing the “CPU fan” which I’ll cover later. (Apologies for the bad cable management – this was still a work in progress): can’t be loaded because JavaScript is disabled: A Brief CPU Fan vs Chassis Fan Comparison (

Case fans come in a wide variety of sizes. You may see them listed in a few different sizes:

  • 80 mm
  • 92 mm
  • 120 mm (these are most common)
  • 140 mm

These fan sizes are also 25 mm in width almost universally. Even though you can find them in just about any size, these are the most common sizes.

What Do Case Fans Do?

Even though case fans have a relatively simple design, they play a critical role. It is the job of these fans to take hot air and blow it out of the case. Then, these fans will take cool air and suck it back into the case.

If these case fans do not work well, your computer will start to overheat, damaging a lot of its internal components. That is why you need to make sure that your case fans work well.

Even though case fans are closely associated with computers, they are found on other types of electronic equipment as well. For example, if you have fancy audio video equipment, such as speakers or a video projector, your case fans are responsible for keeping this equipment cool as well.

In some cases, you may have “dumb” case fans that only spin at a single speed. Even though you might be able to manually adjust the speed of these fans, they do not do so automatically.

Some fans can adjust their speed depending on the temperature of the computer. They will take a look at the temperature, compare it to their speed, and adjust the speed as needed:

ASUS Armory Crate showing various component temperatures and fan speed options

You don’t want the fan to spin too quickly because it might be too loud. On the other hand, if your fan does not spin quickly enough, it might not cool the computer, leading to problems.

Many computer cases come with multiple fans. Then, these fans work in conjunction with heat sinks and computer coolers to keep the computer at an appropriate temperature. If you are taking a look at the case fans, you may want to compare them to your existing heat sink and computer cooler to make sure that everything works well in conjunction with each other.

The fans themselves need to be plugged into a fan connector on your motherboard itself (such as the “CPU_FAN” or “CHA_FAN” connector). Before diving into that topic, let’s quickly cover the difference between CPU fans and chassis fans.

Comparing CPU Fans vs. Chassis Fans

Now, there are multiple fans that have to work together if you want your computer to cool itself properly. The first type of fan is a CPU fan. This is a fan that mounts directly on top of the CPU itself. It is also called your heat sink or CPU cooler, which was mentioned above. The CPU cooler usually has a base that sits directly on top of your CPU:

The top fan of my Noctua NH C14S CPU cooler for my AMD Ryzen CPU

Usually, it is made out of aluminum, copper, or some sort of metal alloy. Then, the base of its cooler has heat pipes that connect to the individual fins. That is where the fan sits. The heat is sucked up by the heat pipes and moved to the fins on the cooler. Then, the fan on the cooler is responsible for pulling heat directly away from the fins. This air is eventually transported to the case fan where it is ejected by the case or chassis fan.

This is very different from the case fan, which is the fan that is mounted on the inside of the case:

Outside of a Corsair Carbide PC case showing the difference between CPU and chassis fans

Even though case fans can be mounted in different locations, they are usually called either intake or exhaust fans:

  • Your intake fan is designed to take cool air from the external world and suck it into the computer to get it to cool down.
  • An outtake fan takes warm air from the inside of the computer and ejects it to the outside world.

There are a few differences between the two fans, even though both are responsible for cooling down your computer.

Chassis fans tend to spin at a single speed, while CPU fans typically adjust their speed depending on the temperature. This is not universal, but it is common and it comes down to how many “pins” the fans have – more on this late.

Chassis fans are mounted directly on the inside of the case, while CPU fans are found on the inside of the system. They then have a wire coming off them, that plugs into the motherboard itself. They also connect to different places on the motherboard – these are called fan connectors:

The three fan connectors on an Asus TUF gaming motherboard

Even though these fans are labeled “case” fans or “chassis” fans, they can be interchangeable in certain situations.

Can You Put Chassis Fans Into CPU Fan Connectors?

Various USB fan and front panel header connectors in my old Asus B350M motherboard

Yes, you are able to take chassis fans and plug them into CPU fan connectors. Keep in mind that this may change how the fan operates, but if you notice that one of your fans is not working as it should, then you might be able to plug it directly into the CPU fan connector. If it doesn’t fit, then don’t force it, but this could be a way for you to effectively cool down your computer.

Since CPU fans tend to change their speed depending on the readings from the CPU, plugging your chassis fan into the CPU fan connector could cause the fan to move up and down in terms of speed, which might be distracting or annoying. The higher the temperature of your computer, the faster the fan will spin, and vice versa. If this isn’t too distracting, then you should be fine.

Can You Plug a CPU Fan Into the Chassis Fan Connector?

You can take your CPU fan and plug it into the chassis fan connector, but remember that the CPU fan typically changes temperature automatically depending on the temperature of your CPU. If you plug your CPU fan into the chassis fan connector, it may no longer be receiving signals from your CPU. Therefore, it will not know whether to spin faster or slower.

If you do not keep an eye on the temperature, the fan might not pull down the CPU enough. Therefore, you may want to see if there is an option to collect temperature signals on your motherboard. Then, you might have to manually adjust the fan speed depending on the temperature of your computer – this can sometimes be done in downloadable software like the ASUS Armory Crate:

ASUS Armory Crate showing the fan speeds currently and different options

If you do not do so, your computer could overheat, which could lead to problems. Even though your computer will technically work if you plug a CPU fan into the chassis, you need to make sure that you are still adequately cooling the rest of the computer.

Comparing 3 Pin and 4 Pin Fan Connectors

As you build your computer, you will also come across 3 pin and 4 pin fan connectors. What are the differences between them?

A 3 Pin Fan

As the name suggests, a 3 pin fan connector has three separate indicators. The first wire is for the power, the second wire is for the ground, and the third wire is for the tachnometric signal, which is the speed sensor. This is the sensor that is responsible for monitoring the speed and performance of your fan.

This speed signal will adjust the power applied to the motor depending on the speed of the fan itself. Therefore, the speed of the fan is controlled by either increasing or reducing the voltage across the power cable. In general, a 3-pin fan is an older style.

A 4 Pin Fan

You may also come across a 4-pin fan. This is more common with modern motherboards. The fourth wire is called the PWM, or the Pulse Width Modulation. This wire controls the power supply and rotation speed of the fan itself.

A four pin fan connector on a modern motherboard

This fourth wire is absolutely critical in the cooling of your computer. This wire is responsible for adjusting the speed of the fan depending on the temperature of the computer. In general, the longer the voltage is applied to the motor of the fan, the higher the fan will spin. This voltage is directly controlled by the PWM signal.

There are a few other differences to note between the fans as well. They include:

  • In general, 3 pin fans are noisier than 4 pin fans. Even though you might notice 4 pin fans more because their speeds might change more often, they are usually not as noisy as 3 pin fans.
  • If you have a newer computer that consumes more power, it will probably require 4 pin fans instead of 3 pin fans.
  • 4 pin fans usually last much longer than 3pin fans. This is because 4 pin fans will change their speed depending on how much speed is needed to cool the computer. In contrast, 3 pin fans rotate at a high speed almost all the time. This causes them to wear out more quickly.

If you are building your own computer, then you will probably want to go with a 4 pin fans. Even though this can be more expensive than a 3 pin fan, it also works better, last longer, and will more efficiently cool your computer.

A 4 pin fan has an automated controller that will automatically adjust the speed of the fan depending on what is needed to cool the computer. This is not something you will find with a 3 pin fan, which is the biggest difference between the two. If you see “PWM,” you are always looking at a 4 pin fan.

How to fix the CPU Fan Error when booting the computer



December 11, 2019

A black screen with an incomprehensible inscription instead of the usual Windows window is scary, but the problem is solved quite simply.

What does the CPU Fan Error mean? Press F1 to Resume

or CPU Fan Error! Press F1 to Run SETUP . As you might guess from the name, the computer self-diagnosis system reports a processor cooling fan error and prompts you to continue or run the settings.

Basically, you can press the F1 key to boot the system and work normally. But you should do this only if you are sure that everything is in order with the cooling and there is no risk of overheating of the processor.

What Causes a CPU Fan Error

The BIOS monitors voltage and other hardware parameters, including fan speeds, before and while the computer is running. The performance of the latter is determined by their rotation frequency.

Error CPU Fan Error! appears when the system detects low fan speeds or their complete absence. Without active cooling, the processor will quickly overheat, so the user is warned about this.

How to fix CPU Fan Error

1. Make sure the fan is spinning

Look inside the system unit, or rather carefully remove the side cover on the left side and check the rotation of the processor fan.

If the cooler is not spinning, then something is probably blocking it. Most often, the rotation of the blades is blocked by wires hanging from the power supply or a large accumulation of dust.

The solution is simple and straightforward: tie up the cables with plastic ties and remove the dust with compressed air and a brush. If the fan is heavily soiled, it may be necessary to remove it by unscrewing the screws or snapping off the latches. All this must be done, of course, when the computer is turned off.

2. Check if the connection is correct

If the fan is clean and easily rotated by hand, but does not rotate while the PC is running, it is most likely not properly connected to the connector on the motherboard.

The connector has a special key that prevents it from being inserted incorrectly into the intended place. And yet, out of ignorance or inattention, this can be done. Especially if you connect a fan with three wires.

Sometimes users get confused and connect the cooler to the wrong connector. There are several of them on the board, and the processor fan must be connected to the one marked as CPU_FAN . It’s easy to confuse it with the nearby CHA_FAN , which is actually a case cooler.

On the left is a connector on the board, on the right are fan connectors with a different number of wires. The purpose of the pins is always the same: 1 — «minus», 2 — «plus», 3 — speed sensor, 4 — speed control / Public domain / Pinterest / Artyom Kozoriz / Lifehacker

In both cases, you just need to insert the plug into the correct connector and so on so that the grooves on the connectors match. The next time you turn it on, everything will work as it should.

3. Increase fan speed

Public domain / Pinterest

In the BIOS settings, you can change the speed of rotation of the cooler. And error CPU Fan Error! often appears if the RPM is set too low. The system simply assumes that the fan is not spinning.

If you have changed these settings, you must disable the Smart Q‑FAN speed control and press F10 to save. You can also choose the speed at which the error will not appear. To do this, you need to gradually increase the speed, save the parameters and reboot to check.

4. Replace the fan

Public domain / Pinterest

In very rare cases, the lack of rotation can be caused by a failure of the cooler itself. You can check its performance by applying voltage from 5 to 12 volts to the connector. It is most convenient to use a Krona battery or four AA cells connected in series.

To do this, the “minus” of the batteries is connected to the connector pin number 1 (black wire), and the “plus” is connected to pin number 2 (red or yellow wire). If the fan does not turn on, you will have to replace it with a new one.

5. Disable rotation monitoring

If the cooler is connected to another connector on the motherboard or you intentionally lowered its speed in order to achieve silent operation, you can disable the rotation control function and, accordingly, get rid of the annoying error. This is only worth doing if you understand the risk of overheating or separately control the temperature using additional software like SpeedFan.

Public domain / Pinterest

To do this, find the CPU FAN Fail Warning option in the BIOS and disable it by setting it to Disabled or Ignored, then save the settings and restart the computer. In some boards, it may be called CPU FAN Speed ​​or a little differently, but in approximately the same meaning.

Read also 🖥💽🔧

  • How to reset the BIOS and revive the computer
  • What to do if the computer’s USB ports do not work
  • What to do if the Internet is lost on Windows
  • What to do if your Windows computer slows down
  • How to restore a hard drive

ASRock X670E Pro RS Motherboard

ASRock X670E Pro RS

  • Support for AMD Ryzen™ 7000 Series Processors
  • 14+2+1 Phase Power Design, SPS
  • 4 x DDR5 DIMMs, supports up to 6600+(OC)
  • 1 PCIe 5.0 x16,
  • 2 PCIe 4.0 x1,
  • 1 M.2 Key-E for WiFi support
  • Graphic output device: 1 HDMI, 1 DisplayPort
  • Realtek A LC897 7.1 HD Codec, Nahimic Audio
  • 1 Blazing M.2 (PCIe Gen5x4),
  • 3 Hyper M.2 (PCIe Gen4x4),
  • 1 M.2 (PCIe Gen3x2 & SATA3),
  • 6 SATA3
  • 1 USB 3. 2 Gen2x2 Type-C (Front),
  • 1 USB 3.2 Gen2 Type-C (Rear),
  • 1 USB 3.2 Gen2 Type-A (Rear),
  • 8 USB 3.2 Gen1 (4 Rear) , 4 Front)
  • Realtek 2.5G LAN
  • 802.11ax Wi-Fi 6E + Bluetooth

SPS (Smart Power Stage)
Latest SPS (Smart Power Stage) power distribution technology. Monitors the current and temperature on each phase, providing a smooth uniform power supply to the processor, improves system performance and provides the ability to overclock components.

Power System
Has durable components and evenly supplies power to the CPU. In addition, it features unrivaled overclocking capabilities with the lowest temperature for advanced gamers.

Low Loss Server Board
Server-grade PCB enhances signal integrity and supports PCIe 5.0 graphics cards and M.2 SSDs, and expands overclocking potential for extreme memory pumping.

8-layer PCB
A total of 8 PCB layers ensure stable electrical signal flow and voltage profiles, reducing temperatures and improving power efficiency when overclocking memory!

Reinforced DIMM Socket
The Reinforced DIMM socket is fixed on the surface of the motherboard to improve physical contact and signal throughput, and thanks to this solution, it becomes possible to overclock memory modules to crazy values.

DDR5 Protection

Due to the unique electrical architecture of DDR5 DIMMs, there is a risk of damage to memory modules if the AC power is incorrectly disconnected during installation or removal. ASRock has implemented a protection circuit on all DDR5 motherboards to reduce the risk of damage to memory modules.

PCIe Gen5 Blazing M.2
The Blazing M.2 slot supports the latest PCI Express 5.0 standard at twice the speed of the previous generation, up to 128Gbps, to unlock the full potential of future ultra-fast SSDs.

XXL M.2 Heatsink

Larger aluminum alloy M.2 heatsink efficiently dissipates excess heat to keep high-speed M.2 SSD temperatures cool, improving system stability under heavy loads.

PCIe 5.0 + Board Mount
Compared to conventional PCIe «DIP» type connectors, «PCIe SMT» type connectors improve signal throughput and stability at high speeds, which is critical for the PCIe 5.0 standard.

The latest PCI Express 5.0 interface delivers staggering speeds of up to 128Gbps, matching the potential of future high-end graphics cards.

Nahimic Audio System
Whether using headphones, a headset, external speakers or the built-in speaker, via USB, Wi-Fi, analog output or HDMI, Nahimic Audio provides the best sound experience with rich detail.


— Supports AMD Socket AM5 Ryzen™ 7000 Series Processors
— AMD X670
— Supports Dual Channel DDR5 Memory Technology
— 4 x DDR5 DIMM
— Support for DDR5 non-ECC, unbuffered up to 6600+(OC)
— Maximum memory: 128 GB
— Support for Extreme Memory Profile (XMP) and Extended Overclocking Profiles (EXPO) memory modules
— 256MB AMI UEFI BIOS with graphics
Integrated AMD RDNA™ 2 graphics (Depends on CPU model)
— 1 x HDMI 2. 1 TMDS/FRL 8G compatible, HDR, HDCP support 2.3 and max. resolution up to 4K 120Hz
— 1 x DisplayPort 1.4 with DSC (compressed), HDCP 2.3 support and max. resolution up to 4K 120Hz
— 7.1CH HD Codec (Realtek ALC897 Audio Codec)
— Nahimic Audio
— 2.5 Gigabit LAN 10/100/1000/2500 Mbps
— Dragon RTL8125BG
— Dragon 2.5G LAN Software support
— Smart traffic auto-tuning
— Intuitive visual interface
— Network statistics display
— Optimal default settings for games
— Configurable Priority Control
Wireless LAN
— 802.11ax Wi-Fi 6E Module
— Supports IEEE 802.11a/b/g/n/ac/ax
— Supports dual-band 2×2 with extended 6GHz support*
— 2 antennas with 2 (transmit) x 2 (receive) diversity
— Bluetooth + High speed class II support
— MU-MIMO support
*Wi-Fi 6E (6 GHz band) will be supported on Microsoft® Windows® 11. Operation of this communications standard may be subject to local laws. It will be activated (for compatible countries) via Windows® and software updates as available.
6E requires a compatible 6GHz router.
— 1 x PCIe 5.0 x16 Slot (PCIE1), supports in x16 mode*
— 2 x PCIe 4.0 x1 Slots (PCIE2 and PCIE3)* E), Support WiFi/BT PCIe WiFi module type 2230
— Gold Plated Pins 15? Gold on VGA PCIe (PCIE1)
*Supports NVMe SSD modules as boot drives
c) mode*
— 1 x Hyper Socket M.2 (M2_2, Key M), support type 2260/2280 PCIe Gen4x4 (64Gb/s) mode*
— 1 x Hyper M.2 Socket (M2_3, Key M), Support type 2260/2280 PCIe Gen4x4 (64 Gb/s) mode*
— 1 x M.2 Socket (M2_4, Key M), Support type 2242/2260/2280 SATA3 6.0 Gb/s & PCIe Gen3x2 (16 Gb/s) modes*
— 1 x Hyper Socket M.2 (M2_5, Key M), support type 2260/2280 PCIe Gen4x4 (64 Gb/s) ) mode*
— 6 x SATA3 6.0 Gb/s
*Supports NVMe SSD modules as boot drives
Supports ASRock U.2 Kit
— Supports RAID 0, RAID 1 and RAID 10 for SATA drives
— Supports RAID 0, RAID 1 and RAID 10 for M. 2 NVMe drives
— 1 x SPI TPM
— 1 x Power indicator and speaker connector
— 1 x RGB LED header*
— 3 x Control header LED s**
— 1 x CPU Fan Header (4-pin)***
— 1 x CPU / Water Pump Fan Header (4-pin) (Smart Fan Speed ​​Control)****
— 4 x Chassis Fan/Water Pump Connector (4-pin) (Smart Fan Speed ​​Control)*****
— 1 x 24-pin ATX Power Connector (High Density Power Connectors)
— 1 x 8-pin 12V Power Connector (High Density Power Connectors)
— 1 x 4-pin 12V Power Connector (High Density Power Connectors)
— 1 x Front Panel Audio Out
— 2 x USB 2.0 (supports up to four USB 2.0)
— 2 x USB 3.2 Gen1s (supports up to four USB 3.2 Gen1)
— 1 x Front Panel Type C USB 3.2 Gen2x2 Header (20Gb/s)
*Supports LED strip 12V/3A, 36W
**Support in total up to 5V/3A, 15W LED Strip
***CPU_FAN1 Support the fan power up to 1A (12W).
****CPU_FAN2/WP Support for the fan power up to 2A (24W).
*****CHA_FAN1~4/WP support the fan power up to 2A (24W).
CPU_FAN2/WP and CHA_FAN1~4/WP are detected automatically when installing fans with 3- or 4-pin connectors.
Rear I/O Panel
— 2 x Antenna Connectors
— 1 x HDMI
— 1 x DisplayPort 1.4
— 1 x Optical SPDIF Out
— 1 x USB 3.2 Gen2 Type-A (10 Gb/s) (ReDriver )
— 1 x USB 3.2 Gen2 Type-C (10 Gb/s) (ReDriver)
— 4 x USB 3.2 Gen1
— 4 x USB 2.0
— 1 x RJ-45 LAN
— 1 x BIOS Flashback Switch
— 1 x Audio Output Jack (Gold Audio Jack)
— 1 x Microphone Input Jack (Gold Audio Jack)


Specifications Motherboard ASRock X670E Pro RS

Processor socket PCI Express Standard
Form factor ATX
Chipset AMD X670E
Memory type DDR5
Number of DDR slots 4
PCI slots PCIe x1*2 slots, PCIe x16
3.0, 5.0
SATA connectors SATA III*6
SSD connectors M.2*4
Video connectors HDMI, DP
USB connectors USB 2.0*6, USB 3.

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