DESC: This 4 GB (2 x 2 GB module) DDR RAM memory module is manufactured by Hewlett Packard. Clock speed is 333 MHz. This product comes with a 3 years parts and labor warranty. Hewlett-Packard offers the highest quality memory available. This ensures uninterrupted, high-speed performance for the lifetime of the memory. That's why every HP memory upgrade is guaranteed with the compatibility, reliability, proven performance, innovation and service.