The Hynix 12GB 4GB DDR3 SO-DIMM PC3-12800S 204-Pin ECC memory kit includes three 4GB modules, providing a total capacity of 12GB. With a form factor of SO-DIMM and DDR3 SDRAM technology, this memory is designed for reliable performance in computers and laptops. The ECC memory feature ensures error correction for added data integrity, while the lifetime manufacturer warranty guarantees long-lasting quality. Perfect for upgrading or replacing existing memory modules, this Hynix product is a dependable choice for enhancing your computer's memory capacity.