Does Computer Power Supply (PSU) Matter?

Does Computer Power Supply (PSU) Matter?

While building a PC, one thing that most people don’t give importance to is choosing a good power supply. Often they use a budget Power supply (PSU) with high-end parts to save money. But it is really a good option? Let’s discuss in this post: 

Does Computer PSU Matter? A computer power supply is a very important part as it is the only part that supplies power to all the other components like CPU, GPU, RAM, Motherboard, HDD. So, if the PSU can’t supply sufficient power then the PC will turn off automatically in the worst case, including performance dips, overheating.

So, the PSU is a very crucial part and if you don’t choose the right one or use budget PSUs with high-end parts, it can cause serious troubles with your PC.

Now, I am not saying that budget power supplies are always bad, but generally good PC parts consume more and consistent power supply. That’s why using a good PSU is important to provide filtered and consistent current.

But, let’s not talk about the issues (mentioned above) first because these can be easily resolved by a PSU which can provide sufficient power. Rather, can the quality of the PSU affect a PC’s performance in different tasks?

Can A Power Supply Affect PC Performance?

A power supply doesn’t affect the performance directly, rather it only causes things like sudden PC shutdown, parts like fans, GPU not working entering the whole PC into power saving mode.

For checking it, I used a very cheap PSU (from Zebronics) and an expensive PSU from Corsair on the same PC. However, I didn’t use a powerful graphics card because the cheap PSU can’t handle it.

So I only choose parts that both PSUs can handle and supply enough power.

Results Of The Test:

After benchmarking 10 games and running other benchmarking softwares, I found that both PCs with different PSUs are giving almost the same performance.

So, we can say that the power supplies don’t cause much performance difference in normal conditions. However, you can see a huge difference if you overclock the system.

Yes, when I overclocked both systems, I found that the PC with premium PSU was giving far better performance. But the PC with a cheap PSU was not able to show much difference after overclocking.

That’s why if you do overclock frequently, with a good PSU you can get a good boost in performance but in a normal scenario, the PSU doesn’t impact the performance much.

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Why Good PSU Is Important?

Now, what are the advantages you get with good PSUs and why you should consider them over the cheap ones?


Good Power supplies are efficient, comes with awesome build quality, and also perfect for overclocking. These can provide constant current, protect from surges and even from small lighting.

In case of lightning, first, the PSU will take it on itself, then only the high surge will spread to other parts.

Moreover, if you have lots of RGB parts, high-end GPU, CPUs which consume a lot of electricity, then a good PSU can only supply enough power to each part.

Produce Less Heat:

Cheap PSUs generally produce heat because of converting and stabilizing the current. Moreover, budget PSUs also lose way much power in this process.

But good power supplies have efficient fans and enough features for cooling down quickly. Nowadays, good PSUs also support running without fans. As they make noise, so the fans on these power supply will only turn on if it is under heavy use.

Comes With Warranty:

One more big advantage of buying PSUs from good brands is that you get 5-7 years warranty on that. Also, without any heavy surge, good PSUs can’t get damaged easily.

So, if you buy good PSUs, as they come with braided cables and build quality is also good, you can expect it to last for a couple of years, actually more than your computer.

These are the main features of good power supplies. Now, what if your PSU is not enough for the PC?

What Happens If You Don’t Have Enough Power For Your PC?

If a PC doesn’t have enough power or the PSU can’t supply enough power, then simply the PC will not start. In some cases, if it starts too, then also the user might see issues like some parts like fans, coolers are not running. So, this can heat up the system.

That’s why you should calculate the overall power uses of a PSU and then buy a slightly higher than the recommended.

Because if you do overclock this extra wattage that PSU can give will matter and boost the performance. And never choose a PSU that can’t give enough power to your PC. But can underpowered PSU damage the hardware?

Can An Underpowered PSU Damage Your Computer?

Underpowered PSU can damage PC parts, mostly insufficient power damage the storage drive like HDD, SSD, motherboard, and also GPU. However it doesn’t damage the parts quickly, but if the parts don’t get enough power for a long time, then this can damage the parts.

Is Too Much Power Supply Bad For Your PC?

Having too much power supply doesn’t affect the PC negatively. Just PSUs that can give more power cost higher, that’s why if you are buying an 850W PSU while your PC only needs 450W then you are just throwing the money in nothing.

Unless you have plans for upgrading the power-consuming parts like GPU, CPU later, you shouldn’t buy PSUs that are overkill for your system. Just buy one that can give slightly more power than your PC needs.

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Overall, the power supply is a very important part of a CPU, motherboard, and RAM. I hope after reading this post, your queries about why power supply is important are solved.

If you have more, feel free to ask me, see you in the next one, be techy:)

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