Why You Might Need to Replace Your Power Supply
Replacing the power supply in your desktop PC is not something most users need to do often, but there are a few common reasons why you may need a new one:
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Your current power supply fails or dies. Power supplies can wear out over time, especially if they’ve been working hard to provide consistent power to high-end components. If your PC won’t turn on at all, a failed power supply is one of the most likely culprits.
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You’re upgrading major components and need more power. If you’re upgrading to a newer high-end graphics card, CPU, lots of RAM, or storage drives, your existing power supply might not provide enough wattage to handle all the new components. Check the requirements.
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The power supply is making noise or smelling funny. Unusual noises like grinding or squealing, a burning smell, or jagged startup behavior can mean the power supply is on its way out. Better to replace it before it fails entirely.
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You want to improve efficiency. Newer power supplies are often more energy efficient. Replacing an old unit can save energy and a bit on your electric bill over time.
Choosing the Right Replacement Power Supply
The most important aspects to consider when selecting a replacement power supply are:
Wattage Capacity
- You need sufficient wattage for all the components inside your PC. Add up the requirements for your CPU, GPU, drives, etc and give yourself some extra headroom. 500-750W is common for many modern gaming PCs.
Form Factor
- The form factor must match your computer case – common options are ATX, SFX, TFX. Check the dimensions.
Connectors
- Ensure the new power supply has all the necessary connectors you need, such as 24-pin ATX, 4+4 pin EPS, 6+2 pin PCIe, SATA power, etc.
Efficiency Rating
- Look for an 80 Plus Bronze certified or better PSU for optimal efficiency and lower electricity usage. Gold, Platinum are even better.
Modular Cables
- Modular cables let you only use the cables your build needs, minimizing clutter. But not essential.
Installation Steps
Replacing a desktop power supply involves just a few key steps:
1. Unplug and switch off the PC
- Unplug the power cable from the back and turn off the PSU switch if there is one. Press the power button to discharge any residual energy.
2. Open up the computer case
- Use a Phillips screwdriver to remove the side panel screws and open up the case. Lay it on its side on a table or bench.
3. Unplug all power cables
- Carefully disconnect all power cables from the motherboard, GPU, drives etc. Trying not to mix up connectors.
4. Unscrew and remove old power supply
- There are typically 4 screws securing the old PSU to the back of the case. Unscrew these with a Phillips screwdriver and slide out the old unit.
5. Install the new power supply
- Slide in the new power supply and screw in the 4 mounting screws. Double check it is properly aligned.
6. Connect all the power cables
- Refer to labels, diagrams, or manual and reconnect all the power cables to their proper places. Take your time.
7. Close up the case and power back on
- Carefully close the case side panel, plug in and switch on the power. Make sure everything boots!
And that’s it – with those steps you can swap out a dead or underpowered supply for a new PSU that will keep your system up and running. Just be slow and methodical as you switch out all those cables!
