8GB (4 X 2 GB) RAM Memory for APPLE MAC PRO 2006 1st Gen 1,1 PC2-5300 ( 8 GB DDR2 667MHz ECC FB DIMM) Lifetime Warranty Built with 1" Apple Required heat sheilds for lower operating temps Free Anti Static Wrist Strap included for Safe installation 100% compatibility guarantee or full money back Lifetime WarrantyDataram, a trusted American brand name since 1968