how to connect power supply to motherboard

Do you want to build your own computer or improve the one you already have? Connecting the power supply to the motherboard is an essential step in the procedure. This makes sure that your components get the electricity they require to work correctly. We’ll go through the necessary tools and provide you step-by-step directions as we take you through the process of how to connect power supply to motherboard in this blog article. So let’s get right in and get going!

Tools Required for Connecting a Power Supply to a Motherboard

It’s important to acquire the required tools before we start the procedure of connecting a power supply to a motherboard. You’ll need the following equipment:

Power supply:



Power cables:

Cable ties:

Thermal paste (optional):

Anti-static wrist strap (optional):


how to connect power supply to motherboard
Hands hold power supply unit with connected wires to install it in the computer case

A power supply unit (PSU) is defined as:

A computer system’s power supply unit, often known as a PSU, is a part that transforms incoming AC (alternating current) electricity from a wall outlet into DC (direct current) power appropriate for powering a motherboard and other peripherals.

Workings and Motherboard Connection:

A PSU’s main job is to supply the motherboard and other computer parts with a steady and dependable power supply.
The motherboard’s required power connections are provided by a cable that connects the PSU to the motherboard.


PSU Mounting Screws:

  • These screws are used to secure the power supply unit to the computer case.
  • The PSU typically has mounting holes on its back panel that align with corresponding holes on the case.
  • The screws are inserted through these holes to hold the PSU securely in place.
  • The specific type of screws required for PSU mounting may vary depending on the computer case design, but they are typically coarse-threaded screws with a head suitable for use with a standard Phillips or flat-head screwdriver.


Phillips Screwdriver:

  • A Phillips screwdriver is the most commonly used type for computer assembly, including securing the PSU to the computer case.
  • It features a cross-shaped tip with four flared edges that fit into the corresponding slots on Phillips screws.
  • The size of the Phillips screwdriver required may vary depending on the screws used in your computer case. It is often recommended to have a #2 Phillips screwdriver, which is a common size for computer screws.

Power cables:

a computer ATX power supply unit and cabling
  1. 24-pin ATX Power Cable:
    • The main power connector that powers the motherboard is the 24-pin ATX power line.
    • It has a 24-pin male connection on one end, which plugs into the motherboard’s equivalent 24-pin female ATX power port.
    • The motherboard’s primary parts, such as the CPU, RAM, chipset, and other integrated circuits, are all powered by this connection.
  2. 4/8-pin CPU Power Cable:
    • The CPU is powered by the EPS power cable, commonly known as the 4/8-pin CPU power cable.
    • It connects to the relevant CPU power port on the motherboard via a 4 or 8-pin male connection on one end.
    • This cable makes sure that the CPU gets the electricity it needs to function.

Cable ties:

Here’s why cable ties are beneficial in PSU connections and overall cable management:

  1. Organization and Neatness:
    • The cables within the computer casing may be kept tidy and organised with the use of cable ties.
    • They can be used to bundle and organise the different power lines, reducing tangling and airflow obstruction.
    • Airflow inside the chassis is improved by neat cable management, which may enhance cooling efficiency and overall system stability.
  2. Improved Airflow and Cooling:
    • Cables can restrict airflow within the computer casing and raise the temperature if they are tangled or positioned carelessly.
    • You may open paths for airflow and improve cooling efficiency by using cable ties to direct and secure the cables away from important components.
    • Cooler temperatures contribute to preserving maximum performance and extending the life of components, such as the motherboard and power supply unit (PSU).
  3. Easy Troubleshooting and Maintenance:
    • When doing maintenance or troubleshooting duties, it is simpler to locate and identify individual components when the wires are organised well.
    • It is easier to locate a specific cable’s source or to disconnect and rejoin cables when necessary when cables are handled and secured appropriately.
  4. Aesthetics and Professional Look:
    • The interior of the computer case is given a tidy and professional appearance by cable ties.
    • You may create a tidy, organised look that is aesthetically pleasing by carefully bundling and fastening the cords.
    • This is particularly crucial if your computer case has a transparent side panel since it provides a nice view of the internal parts.

Thermal paste (optional):

Thermal grease cooling the hot temperature of the laptop.

CPU Cooling Performance:

  • Thermal paste’s use guarantees improved CPU heat dissipation, which contributes to maintaining lower temperatures.
  • Lower CPU temperatures are good for system stability overall since high temperatures can degrade performance and possibly even harm the CPU over time.
  • Thermal throttling, which can happen when the CPU reaches dangerous temperatures, can be avoided with proper thermal paste application, which also helps to optimise cooling efficiency.

Anti-static wrist strap (optional):

An optional yet useful equipment used in electrical assembly and computer repair is an anti-static wrist strap. Its goal is to stop static electricity from accumulating and discharging, which might possibly harm delicate electronic components.

The wrist strap creates a secure environment for handling delicate parts, lowering the risk of electrostatic discharge (ESD), and preserving the durability and dependability of electronic equipment by grounding the wearer and dispersing static charges.

Steps for Connecting Power Supply to a Motherboard

STEP 1 :

Before you begin, ensure that your computer is turned off and unplugged from the power source. This is crucial for your safety and to prevent any damage to the components.


Open your computer case by removing the screws or latches that hold the side panel in place. Refer to your computer case manual if you’re unsure how to open it.

STEP 3 :

Find the power supply unit (PSU) in the casing of your computer. Usually, the top or bottom of the rear part.

STEP 4 :

You might need to remove any protective covers or brackets that came with your PSU and computer case in order to reach the PSU mounting location.


Align the mounting holes in the casing with the PSU. Utilising the given screws, fix it in place. To tighten the screws, use a screwdriver, but take care not to overtighten them.

STEP 6 :

Find the primary power connector on the PSU once it has been safely fitted. It typically has 20 or 24 pins and is a big, rectangular connection.


Find the motherboard’s equivalent main power connection. It’s also a large, rectangular socket that is typically found next to the CPU socket.


Align the main power connection on the motherboard with the main power cord that you removed from the PSU. Make sure the socket holes and connecting pins line up. Make the connection gently; do not force it; it should fit snugly.


Until it is completely seated, Align the main power connection on the motherboard with the main power cord that you removed from the PSU. Make sure the socket holes and connecting pins line up. Make the connection gently; do not force it; it should fit snugly.

STEP 10:

Firmly insert the main power connection into the socket. It ought to fit securely and snugly.

STEP 11:

Next, determine if your motherboard needs a second power connection. There may be an extra 4, 6, or 8-pin power socket next the CPU socket on some motherboards, particularly those made for high-end CPUs or gaming systems. Find the matching power line from the PSU if your motherboard has this socket.

STEP 12:

Connect the additional power line firmly after aligning it with the motherboard’s socket. Once again check that the connection’s pins and holes match, and then carefully insert the connector until it is firmly placed in the socket.

STEP 13 :

The CPU, RAM, storage discs, and expansion cards can now be attached to the motherboard after the power supply has been connected. For detailed instructions on how to connect these components, consult the manuals of the individual parts.

Once everything is connected, take some time to arrange the connections within the computer case. To bundle and secure the cables, use cable ties, making sure they are properly organised and do not hinder airflow.

STEP 14:

Verify again that all connections are secure and wires are positioned appropriately once everything has been connected and organised.


Finally, close the computer case by reattaching the side panel and securing it with the screws or latches.

Congratulations! The power supply and motherboard are now properly connected. Now that your computer is plugged in and powered on, you may start configuring your operating system and other software.


Remember to refer to the instructions or ask a professional for help if you run into any problems or have questions about any step.

Throughout the procedure, safety and careful handling of computer components are crucial.



Double-check cable compatibility:

Make that your power supply and motherboard are compatible with the power cords you’re using. Make sure the connectors are compatible because different motherboards and power supplies may utilise various connector types.

Route cables away from fans:

When routing cables inside the computer case, ensure that they are kept away from any cooling fans. Cables obstructing fans can disrupt airflow and cause components to overheat.

Use cable combs or clips:

Your cables may be kept organised and kept from tangling with the use of cable combs or clips. They are simple to fasten to certain spots in the case for cable management, such as the rear of the motherboard tray.

Test the system before final assembly:

Connect the power supply and necessary parts before shutting the computer case all the way to make sure everything is operating as it should. This makes it simpler to troubleshoot problems and make modifications down the road.

Consult online resources or seek assistance:

Never be afraid to check online tutorials, forums, or ask for help from knowledgeable people if you need clarity on any step. There are many resources out there that can provide you direction and support you as you go through the process.


Unplug the power cord:

Before using your computer, always remember to disconnect the power connection from the wall socket. This reduces the possibility of electric shock, ensuring your safety.

Avoid working on a carpeted surface:

Static electricity produced by carpets has the potential to harm delicate computer parts. To work on, pick a flat, non-carpeted surface; ideally, do it on a grounded table or a static-dissipating mat.

Handle the power supply with care:

The power supply contains high-voltage components even when unplugged. Avoid opening the power supply casing, as it can expose you to electric shock. If you suspect a fault with the power supply, seek professional assistance.

Be cautious of sharp edges:

Computer cases and components may have sharp edges that can cause cuts or injuries. Handle them carefully, and if necessary, use gloves to protect your hands.

Keep liquids away:

When working on computer components, stay away from your workplace when eating, drinking, or putting any liquids there. Liquid spills on the motherboard or power supply might result in damage and put the user at danger of receiving an electric shock.

Do I need both the 8 pin and 4 pin CPU power plug?

The need for both the 8 pin and 4 pin CPU power plug depends on your motherboard and CPU requirements.

Where do I plug in my CPU power cable?

Plug the CPU power cable into the corresponding CPU power socket on the motherboard.

Can you plug 20 pin into 24 pin?

You cannot directly plug a 20-pin power connector into a 24-pin motherboard socket without an adapter.

Q: Why is it important to connect the power supply to the motherboard?

A: Connecting the power supply to the motherboard ensures that the components receive the necessary power to function correctly.

Q: What should I do if my power supply doesn’t have the required connectors?

A: If your power supply doesn’t have the necessary connectors, you may need to upgrade your power supply or use adapters to make the connections.

Q: How can I determine the power requirements for my system?

A: You can check the power requirements of your components, such as the CPU and graphics card, and add them up to determine the total power needed for your system. Make sure to choose a power supply with a wattage higher than the total power requirement.


here are several types of power supplies commonly used in computers:

ATX Power Supply:

The most popular kind of power supply for desktop computers is ATX (Advanced Technology eXtended). It supports ATX motherboards and offers the power that the system components require.

SFX Power Supply:

Small Form Factor (SFX) power supply are more portable and made for mini-ITX or tiny computer enclosures. They supply energy to systems with constrained space.

TFX Power Supply:

Slim computer cases or those with low profiles frequently use TFX (Thin Form Factor) power supply since they are so small. Small desktop computers or HTPC (Home Theatre PC) systems frequently have them.

Flex Power Supply:

Compact, extremely flexible flex power supply are utilised in tiny form factor devices like micro PCs and servers.

EPS Power Supply:

Entry-level servers and workstations typically utilise power supplies known as EPSs (Entry-level Power Supplies). Compared to typical ATX power supply, it has more ports and greater power outputs.

Redundant Power Supply:

Servers and important systems that demand high availability employ redundant power supply. They are made up of many power supply units that cooperate to provide backup power in the event of a malfunction.

These are a few of the most prevalent power supply types found in computer systems, each with a unique form factor and set of parameters to meet various system needs.



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