However, an important aspect that even expert builders can overlook is the physical dimensions of your hardware.

So, before you build your PC, here are the measurements it’s crucial that you check.

Thankfully, this is a standardized system.

Some computer parts with a ruler measuring them.

Lucas Gouveia / How-To Geek |EKKAPHAN CHIMPALEE/ Shutterstock

PC cases follow the same dimensions.

Any case by a reputable brand will have compatible motherboard sizes listed on its spec sheet.

CPU Cooler Height and RAM Clearance

Similar to GPUs, air CPU coolers are larger than ever.

MSI Geforce RTX Graphics card

Hannah Stryker / How-To Geek

Consumers demand powerfulaftermarket coolingthat can keep their CPU temps low to maintain their maximum boost clocks for longer.

Fortunately, case manufacturers typically cite the maximum CPU cooler height.

RAM clearance is another massive headache with CPU coolers.

Image of an air CPU cooler with two fans inside a computer.

Ismar Hrnjicevic / How-To Geek

High-profile RAM modules with elaborate heatsink designs add bulk to the sticks.

you’ve got the option to usually find RAM clearance in the product specs.

you might also opt for low-profile RAM modules to give yourself more room.

A gaming PC with Kingston memory, RGB fans, lights, MSI CPU cooler, and GeForce RTX GPU.

Justin Duino / How-To Geek

Storage Drive Bays

There are two main storage bay sizes2.5" and 3.5".

2.5" is reserved for SSDs and slim laptop-style HDDs, whereas 3.5" is used for traditional HDDs.

So, plan ahead and either buy a larger SSD or a case that supports several 2.5" drives.

That’s why you should first check the fan sizes that your case supports.

you might always add more fans later, anyway.

The most common one is ATX PS/2, which is used in most PCs.

It’s followed by ATX PS/3, which is slightly shorter and is more suitable for small cases.

The smallest consumer-grade PSUs are SFX and the slightly larger SFX-L.

These are used in tiny SFF cases that don’t support full-size PSUs.

You also have to check cable types and length, as these are not completely standardized.

PSUs generally have cable lengths listed on the spec sheet.

Alternatively, load the radiator at the top if your case supports it.

Remember, it’s easier to check for compatibility than to spend hours figuring out how the pieces fit.