Incompatible RAM will cause boot loops.

Probably. The laptop may not boot at all, or it might boot and crash randomly. Either way, it’s not a fun time.

RAM compatibility is picky. The biggest issues are mismatched DDR generation (DDR3 vs DDR4), unsupported speed (laptop might not handle 3200MHz), or wrong voltage (some low-power laptops need 1.2V, not 1.35V). Even if it fits physically, the motherboard may just refuse it.

If you’re lucky, the system will post but be unstable. You’ll get blue screens, app crashes, or random freezes. Not a great debugging experience.

Check the laptop’s manual or use a compatibility tool like Crucial’s scanner. Don’t guess. Memory is cheap enough that buying the right stick is worth the peace of mind.