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Homemade DIY Desktop Cooling for PC : No Money Spent!

Thinking of buying an additional cabinet fan to phase out the heat but don’t have money? then why not try home-made DIY desktop cooling for PC at home from the old Desktop junk itself.

diy desktop cooling for pc
Overheating can damage your desktop computer’s components, specially processor and  graphics card. And to overcome the problem, often people install additional cooling fans in the cabinet which decreases the cabinet temperature by a considerable margin.

So, let’s start, shall we?


  1. Electrical/Insulating tape.
  2. Scissor.
  3. Adult supervision(if you a minor).
  4. Old Power Supply (SMPS).
  5. Torx (star ) screwdriver.
  6. Wire cutter/splitter.

Things required to make desktop cooling fan



Take out the old Power supply.

Old Power Supply for Desktop Cooling


Open the cover with the screw driver, and then you will see something like this.




Take out the screws from the fan side, which is holding the fan inside the power supply. Keep the screws that you will get after taking out the fan from the power supply as they will com handy in fixing the fan in the cabinet, later on.

Now that you have taken out the fan successfully, clean it with water. Leave it to dry or use blower to do the same in short time.

Desktop Cooling fan in progress


In my hand, you can see  the power wire of the fan with socket for connection. And in inset picture you see the naked wires without the socket which I pulled out by wire cutter.

Basically, wires are in two colors, black and red but it may vary and you might have yellow and black combination or any other.

Desktop cooling Fan

That’s the empty panel for fans given in the cabinet. Clean it if there is dust accumulating.

External cooling fan space in desktop cabinet


Time to place it in the panel with screws that we kept earlier from the FAN disassembling.  Screw them in clock-wise motion as you can see in the picture below.

When done, it will look like the image B


Time to concentrate and do it with precision. I strongly advice Adult Supervision, in case  you a minor.

Our new fan needs power supply to run, so we will use either hard disk power wire that generally has sub outlet for fans or looks for independent unused wire.

Power wire from power supply

Wires are colored for the purpose of easy identification only. Now see the power connector’s red and black wires going into right sockets, so we put the red wire in the socket having red wire connected and the black one in the socket with same color wire coming into it.

If you are not satisfied with the fan speed, then plug the red wire into the YELLOW one as it is +12v .

Connecting desktop cabinet cooling fan

Connecting Fan’s power wire(R) with (L)power source coming from Power Supply


Do a test run and if the fan is working fine, then tape the connection like I did as shown in the picture.

Stick the connection to the cover of SMPS like I did for avoiding any contact between any of the fans.

And you are done!


What this DIY desktop cooling for PC is not for?

A particular component is heating-up more  as compared to other components. It may be due dust accumulation and not because of extra heat in the cabinet. I suggest you to clean it before doing making cooling system.

This method of homemade desktop cooling system is quite effective unless you have hardware fault or dust piling in your components.

How are we going to compare effectiveness of this homemade desktop cooling system?

Time to test the effectiveness of the newly installed fan. We will strain the processor to maximum and record the temperature with and without the cooling pad.

For testing we are using Prime95 for stressing the processor and Furmark for stressing the Graphics card. These two will take CPU and GPU  usage to 100% which a unrealistically high load. Actual load may never reach this value. For measuring the temperature we are using HWmonitor.


Test system:

  1. 3rd Gen Intel Core i5 3330 Processor
  2. 4GB RAM
  3. OS: Windows 7 SP1 64-bit
  4. Graphics Card : AMD/ATI 7870 GDDR5 512mb
  5. Desktop Build Age: 1.5 Years old and used in all sorts of conditions.
Processor Test Results
No Surface Temperature after 30 minutes
With cooling system Without
1 Hard (table) 49 °C 67°C
2 Soft (sofa) 51 °C 76°C
GPU Test Results
No Surface Temperature after 30 minutes
With cooling system Without
1 Hard (table) 55 °C 77°C
2 Soft (sofa) 49 °C 83°C



It helped in cooling down the core heat generating desktop component’s temperature upto 39%, which we can assume as a sucess for homemade desktop cooling fan.

And if you don’t see any change in temperatures then I wold suggest you to clean the piling dust in the components by clocking it to normal speed.

I hope this tut helps you and if you have any kind of doubt, then feel free to ask via below comment box. All the best!

About Amaan Rizwan

I'm a blogger who is in love with Computer hardware and software. Little shy but want to fly high in the sky. You can connect with me on Google Plus and Twitter @amaanthinks