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: 4096 Internal memory type: DDR2 Memory form factor: 200-pin SO-DIMM CAS latency: 5 Memory voltage: 1.8 V ECC: N Registered: N Memory bus: 64 Lead plating: Gold Module configuration: 256M X 64 Compatibility: MA940G/A (Apple) Mac compatibility: Y