8GB Kit ( 2 x 4GB Modules ) DDR2 667 MHz ( PC2-5300 ) DDR2 SO-DIMM ( 200-Pin ) Non-ECC Unbuffered Apple Mac Certified Memory RAM Upgrade Designed For Select Apple Mac Systems: MacBook (for a complete list of compatible systems, see the description section) Compatible Apple Order Numbers: MB881LL/A Compatible Apple Model IDs: MacBook5,2 Compatible Apple Model Numbers/EMC: A1181 (EMC 2300) A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase