4GB DDR3  PC3L-12800 Laptop module that operates at speeds up to 1600mhz and has a CL17 latency. It is an Buffered SODIMM. It conforms to the industry standard DDR3 SODIMM layout of 204 pins and is compatible with systems that take DDR3 1600mhz SODIMM memory. Compatible WITH DDR3 Laptops