AddOn Networks 4GB DDR3-1333 memory module 1 x 4 GB ECC

This HP® 647907-B21 compatible 4GB DDR3-1333MHz dual rank Unbuffered ECC 1.35V 240-pin CL9 factory original UDIMM is 100% guaranteed to be compatible with your system and to work right the first time. Adding additional memory is the best way to increase the performance of your system. All our memory is built to strict JEDEC standards to meet or exceed the Tier 1 OEM's factory requirements. Our products are also guaranteed by the Magnuson-Moss Warranty Act to not affect or void OEM warranties.