Modules came out of working laptops that were upgraded. All modules are 100% workingEnhance your laptop's performance with these DDR4 RAM modules from Micron/SKhynix. With a total capacity of 16GB spread across 4GB modules, you can easily upgrade your system's memory capacity. The SO-DIMM form factor makes installation quick and easy, while the DDR4 SDRAM technology ensures fast data transfer speeds. Ideal for users looking to increase their system's RAM capacity, these modules also feature ECC memory for added reliability and error correction. Upgrade your laptop's memory with this reliable and high-quality RAM solution.