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: 1024 Internal memory type: DDR2 Memory form factor: 200-pin SO-DIMM CAS latency: 5 Memory voltage: 1.8 V Registered: N Memory bus: 64 Module configuration: 128M X 64 Compatibility: 406727-001 (HP); 409060-001 (HP); 414046-001 (HP); 417055-001 (HP); 431403-001 (HP); 432970-001 (HP); 434742-001 (HP); 446495-001 (HP); 448150-003 (HP); 448150-004 (HP); 451738-001 (HP); 452062-001 (HP); 454922-001 (HP); 485029-004 (HP); 5188-5503 (HP); 537664-001 (HP); EM994AA (HP); EM994UT (HP); GK995AA (HP); RN635-69005 (HP) Mac compatibility: N