It is best to match the speed of your existing RAM. If you mix speeds, the system will default to the slowest stick's speed.
Laptops use SO-DIMM (small outline) modules, which are shorter than desktop DIMMs.
Go to the Dell Support site , enter your Service Tag, and click View Product Specs to see the original configuration and maximum supported RAM (e.g., 16GB, 32GB).
Match the DDR generation (e.g., DDR4 or DDR5). These are not backward-compatible; a DDR5 slot will not fit a DDR4 stick.
Before buying anything, you must know what your laptop can handle.
