RAM upgrades won’t void your warranty.

Usually not — as long as you don’t physically damage anything in the process.

In the US, the Magnuson-Moss Warranty Act says manufacturers can’t force you to use their service just to keep the warranty valid. If the laptop or desktop has user-accessible RAM slots and doesn’t say “opening this voids warranty,” you’re probably fine. Apple used to make this tricky with soldered RAM, but on anything with replaceable modules, they can’t legally deny a warranty claim unless you broke something (like a cracked motherboard or ripped ribbon cable).

Still, check the fine print. Some manufacturers have weird clauses about “authorized upgrades only.” Lenovo and Dell generally let you swap RAM. Acer and HP can be hit or miss. If you’re nervous, take a photo of the inside before you touch anything — that covers your ass if they try to claim pre-existing damage.

Just don’t force anything. If the RAM clicks in easily, you’re golden. If you have to bend the motherboard, stop.