SO-DIMM RAM modules are modules for a laptop, MacBook, or iMac. A SO-DIMM RAM module does the same as a DIMM RAM, but due to its compact size, these modules only fit in smaller devices. With this type of RAM module, you can increase the amount of RAM in your laptop or Mac and make it faster. Check the motherboard of your device if it needs a DDR4 or a DDR5 module.