Arch Memory 4 GB (2 x 2 GB) 200-Pin DDR2 So-dimm for Dell Inspiron 15 (1520) Core 2 Duo 1.66 GHz RAM Arch Memory is a Registered Trademark of Arch Computer, LLC Data Transfer Rate: 800Mhz System Type: Laptops Bus Type: PC-6400 Certified for this Dell Model