32.0GB OWC Matched Set (4x 8GB) PC-8500 1066MHz DDR3 ECC SDRAM Modules for Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' systems and Early 2009 Xserve. OWC Lifetime Advance Replacement Limited Warranty. OWC Memory for Mac Pro Quad Xeon fully meets Apple's specifications with special attention to proper thermal specifications.