Do PSU Have Different Sizes

Do PSU have Different Sizes? (All Size Explained)

Many beginner PC builders want to know the different power supply sizes; if you are one of those, then you are in the right place.

I did a ton of research about the size & shapes of PSUs, and here in this article, I will provide a straightforward explanation.

So, Do PSU have Different Sizes?

Yes! PSUs have different sizes. Most PSU comes in standard ATX sizes whose height and width are the same but differ in depth. The other PSU standards like SFX, TFX, and LFX also come in different sizes. 

All the different PSUs and sizes are explained below, so keep reading this article until the end.

Does PSU have a Standard Size?

A power supply is one of the critical components of the computer system, and it comes in different form factors, shapes, brands, and sizes. Here I made a list of different power supplies standards and their sizes. Here W stands for the width, H stands for the height, and D stands for depth.

PSU StandardSizes
ATX PS/2150mm(W) x 86mm(H) x 140mm (D)
ATX PS/3150mm(W) x 86mm(H) x 100mm (D)
ATX Large150mm(W) x 86mm(H) x 180mm (D)
ATX- EPS150mm(W) x 86mm(H) x 230mm (D)
SFX125mm(W) x 63.5mm(H) x 100mm (D)
TFX85mm(W) x 64mm(H) x 175mm (D)
LFX62mm(W) x 72mm(H) x 210mm (D

The ATX PS/2 is the most popular PSU form factor and is also known as Standard ATX PSU. The only difference between PS/2 & PS/3 is the depth. The PS/3 PSU has a shorter depth of 100mm, while the depth of the PS/2 PSU is around 140mm.

The TFX form factor is commonly used in computer cases with limited height or non-standard shapes. It has similar to Flex ATX but is bigger in all dimensions.

Does Power Supply Size Matter?

Yes! The power supply size matters, and if you don’t pick the correct power supply, then it will not fit inside your PC case. 

Although any regular PSU will fit inside any microATX or ATX case, the case size typically refers to the maximum size motherboard it fits and its physical size. The full tower ATX case or mid-tower ATX case both supports ATX motherboards and full-sized power supplies.

Now, let’s discuss this topic in-depth-

Like Hard Drives, the PSUs also come in different shapes & sizes. The shape & size of the PSU is significant for PC building.

If you buy a Standard ATX PSU, also known as a full tower power supply or a small form factor called ITX, some physical limitations may prevent you from installing the PSU.

The main issue that will prevent you from installing the PSU is the compatibility with your PC case. In simple terms, if the PC case allows you, then you can use a full-size power supply with a mini-computer.

Suppose you will not use a PC case and leave your system open in that scenario; a Standard ATX PSU will be compatible with most computers.

Overall, it’s clear that the power supply size matter just because of the PC case compatibility, and that’s why it’s recommended that when you pick a PSU size, you should consider the Case form factor as well.

Are All ATX PSU the Same Size?

Yes! the height and width of the different ATX PSUs are almost the same; the only difference is in-depth. In some instances, the fan position may vary. So, you need to look at the dimensions carefully. 

Let’s take an example- the height & width of the ATX PS/2 and ATX PS/3 power supply is the same(150mm(W) x 86mm(H)), but the depth of the ATX PS/2 PSU is 140mm, and the depth of ATX PS/3 is 100mm.

If the height and width also vary, then you wouldn’t be able to install the PSUs in most PC cases.

However, some higher wattage PSUs tend to be longer. For instance, the 850W PSU is 7 inches long, while the 1600W PSU is 9 inches long.

What Size Power Supply Do I Need?

Experts always recommend using the pcpartpicker.com website, which will give you an exact idea of how powerful PSU you require.

But when it comes to PSU sizes, then you should have to check it manually. I am trying to say that you need to check your PC case compatibility with the power supply.

Every PC has a space for the power supply unit, but the space may vary in shape and size. The small form factor PC cases cannot accommodate a PSU meant for a mid or full-tower PC case.

So, before buying the power supply, you should have to check whether it has a designated space to install the PSU or not.

Also Read: Can PSU Be Too Powerful?

What Size Power Supply for Gaming PC?

The modern gaming systems with a 6 or 8-core CPU or mid to high-end graphics cards require a 650W to 850W power supply. The 750W of the power supply may consider the sweet spot for the gamers.

Usually, PSU with 800W is generally 7 inches long, and if you are planning to build a gaming PC, then you may use a standard ATX or microATX case, and these towers are roughly 18 inches high and 8 inches long.

These towers are capable enough to provide space for PSUs. So, if you use a spacious PC case, then there is no need to worry about the space of PSUs.

Final Thoughts

After discussing all the things, it is clear that PSUs come in different sizes, and before picking the power supply, you should check whether your case is spacious enough or not. That’s why choosing the PSU at the end of the PC building is recommended when you know which components you will use.

I hope this article is helpful for you & clears all of your doubts. To know more about the power suppliers, PC cases, and other different PC components, follow this blog.


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