Yes, that is definitely important. Check your PC's model and look online or in the "System Information" so that you can see how much RAM is physically supported. In particular, laptops and mobile devices often don't even let you add RAM as their design is very compact and everything is tightly integrated both in software and hardware. The computers that do may only support 16GB, such as older iMacs, while gaming PCs and high-end computers often support 32GB or more.

You also need to watch out for the type of RAM: even if the computer supports extra RAM, it may not be the right model. There are DDR3, DDR4, and DDR5 RAM chips, and some computers don't support them all. There are also UDIMMs for desktops and SODIMMs for laptops, and UDIMMs/SODIMMs are larger/smaller so they may not fit properly.

Fortunately, if you have unsupported RAM you may be able to return it or sell it on a platform like eBay or Craigslist, as RAM is more or less always in demand. Or you can simply wait until you have a computer which can be extended with the RAM.
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