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: 667 Internal memory: 8192 Internal memory type: DDR2 Memory layout: 2 x 4096 CAS latency: 5 Memory voltage: 1.8 V Registered: Y Memory bus: 72 Lead plating: Gold Module configuration: 512M X 72 Compatibility: 397415-B21 (HP); 397415-S21 (HP); EM162AA (HP) Bus clock rate: 667