Kingston Technology is the world?s independent memory leader and is well-known for providing high quality memory products at an attractive price. System Specific memory modules are designed and tested in the relevant systems prior to release; and they are guaranteed to be 100% compatible with your system. All Kingston System Specific memory come with a lifetime warranty. Memory clock speed: 533 Internal memory: 256 Internal memory type: DDR2 Memory form factor: 144-pin SO-DIMM Memory voltage: 1.8 V Registered: N Memory bus: 16 Lead plating: Gold Module configuration: 128M X 16 Compatibility: CB423-67951 (HP); CB423A (HP) Rack mounting: 144-pin SODIMM