Can You Power A GPU With A Separate PSU

Can You Power A GPU With A Separate PSU? (Explained!)

Many gamers think of adding an extra PSU to power their GPU individually, but how does it work, and how safe is it?

I have been building PC for the last couple of years, and after doing some research & experiment, I am writing this article to inform you of the truth behind this.

So, Can You Power A GPU with a Separate PSU?

Yes! It’s possible to use a different PSU to supply the necessary power for your GPU; all you need is an adapter board that attaches a spare Molex power connector from the main PSU, and then you need to plug the 24-pin from the secondary PSU into it. 

When you turn the computer on, the main PSU powers the adapter, which sends a signal to the secondary PSU to turn itself on.

Although, experienced PC builders always recommend using one power supply that is capable enough to supply the necessary power by your graphics card.

But, if your existing PSU is not powerful enough or you want to experiment with a separate PSU, then you can go for this option.

But you need to remember a couple of things when you are powering GPU with a separate Power supply, so let’s take a look at those key points-

  • While using a separate PSU, you should care that your PSU never shuts down.
  • Secondly, you must keep track of what’s plugged in at which location.
  • Thirdly, You should start both the PSU simultaneously and ensure that the power should not get interrupted while using this method.
  • Fourthly, turn off the PSU powering the GPU after the main computer shuts down.
  • Finally, You should calculate the required power by your graphics before picking the separate power supply.

These are some of the things you need to remember when using a separate power supply for your graphics.

I know that you still have many questions, like can you use a PSU from one PC to power the GPU on another PC and whether this process is safe or not? All these questions are answered below, so keep reading this article till the end.

How Safe Is It To Power A GPU From Separate Power Supply?

Many gamers want to play some high-end AAA games in their systems, but when they want to add a powerful graphics card into their prebuilt system, they find that the PSU doesn’t have enough wattage to supply the necessary power for the graphics.

I have also faced such a situation like this; I had an old system containing 300W PSU and RX 560 graphics, but there is a problem that a card like RX 560 will not work on such low spec PSU, and it at least needs 400W PSU.

If you have similar spec-based old systems, then you might be wondering what you can do in such a situation; there are 2 options in front of you.

The first sensible option is to upgrade the power supply, which is a little more powerful. But, imagine for a second that this is one of the old prebuilt systems with funny shape components; you can’t upgrade the PSU because of shapes, and the motherboard is over a different form factor than it used to; you cant stick that in a new case.

So, what do you do then? Well, the next sensible option is to find graphics like GT 1030 or GTX 750 TI graphics, and you can stick in this system and play a few games at fairly respectable settings.

But, to do so, you need a power supply adapter; it will allow you to connect a second PSU to your system to power the graphics card separately if your main PSU doesn’t output enough. 

Check out the Multiple Power Supply Adapter and Daisy Chain Connector Add2PSU by Genetek Electric (Black). It is the most sold-out power supply adapter on Amazon.

After purchasing the adapter from Amazon, you must take the Molex connector from your primary PSU and plug that connector into the board. Next, take the secondary PSU and hook up the 24-pin ATX connector to the other side. 

Now, if you turn on your PC, you will notice that both the PSU will power up and your PC will start up. After that, you can play games on the system to check the performance and issues.

If you face any issues while doing the attachment, then you can watch the youtube tutorial mentioned below-

Also Read: Can PSU Cables Goes Bad?

Can I Use A PSU From One PC To Power the GPU on Another PC?

Yes! It’s possible to use the PSU of one PC to supply the power to the GPU on another PC, but to do so, you should need the dual power adapter, and besides that, you need to check the necessary power for your components.

Just calculate your system’s components, especially the graphics power requirement, and if the PSU’s power is sufficient enough to supply the required power, then you can pick that.

Using Separate PSU For 2nd GPU, PSU Not Powering On

If you have just bought a GPU and a separate power supply, and after connecting both the components, you notice that the PSU is not turning on, then there is a slight possibility that the PSU is not getting the signal from the motherboard.

A power supply is not turned on until it receives a signal from the motherboard through the 24-pin cable. If you want to bypass then, you need to buy a 2-pin PSU tester or use a paperclip. It is the only way that your power supply will turn on.

Also Read: Can PSU Cause Stuttering?

Final Thoughts

Based on all the examples, it’s clear that you can definitely use a separate power supply to provide the power to your GPU. But, expert gamers and PC builders don’t recommend doing this for the long term; if you want to do some experiments, then you can do otherwise; it’s always a better option to upgrade the components like PSU or GPU.

I hope this article is helpful for you and clears all of your doubts; if you want to know more about the GPUs, power supply, and other PC components, then follow this blog regularly.


Also Read