Specification Brand : OWC BulletPoint1 : IMPORTANT: Your Mac Pro can use ECC Unbuffered or ECC Registered Memory, but they cannot be combined. Please remove all Unbuffered Memory when installing these Registered DIMMS. BulletPoint2 : OWC 16.0GB UPGRADE: Consists of Two16GB DDR3 1066MHz PC3-8500 CL7 ECC Registered DIMMs 1.5V 240-pin Memory Module with Mac qualified Thermal Sensor EEPROM BulletPoint3 : 100% COMPLIANT: With JEDEC Standard Specifications, ROHS Compliant, Warranty Safe Upgrade. Designed and Tested to Meet or Exceed All MAC Specifications for Mac Pro 2009-2010 Nehalem 4,1 and 5,1, 2009 Xserve 3,1 BulletPoint4 : COMPATIBLE PART NUMBERS: KTA-MP1066/8G, KTA-MP1066S/8G, KTA-MP1066/8G, KTA-MP1066S/8G, HMT31GR7AFR4C-H9, M391B1G73BH0-CH9, M391B1G73AH0-CH9 BulletPoint5 : COMPATIBLE WITH: Mac Pro Quad-Core (Model ID: MacPro5,1) Mac Pro Quad-Core (Model ID: MacPro4,1) Mac Pro 6-Core (Model ID: MacPro4,1) Mac Pro 8-Core (Model ID: MacPro4,1) Xserve Quad-Core (Model ID Xserve 3,1) Xserve 8-core (Model ID Xserve 4,1) BulletPoint6 : INDUSTRY LEADING: Consumer Friendly Advanced Replacement Program and Limited Lifetime Warranty, which Includes Free Tech Support by Other World Computing Color : Multicolor ColumnAddressStrobeLatency : 7 CompatibleDevices : Desktop CustomerPackageType : Standard Packaging DataTransferRate : 1066 MHz DigitalStorageCapacity : 8 GB ExternallyAssignedProductIdentifier1 : 812437024548 ExternallyAssignedProductIdentifier2 : 0812437024548 ExternallyAssignedProductIdentifier3 : 00168141555381 ExternallyAssignedProductIdentifier4 : 0740617157352 ExternallyAssignedProductIdentifier5 : 00740617157352 FormFactor : DIMM GpsrSafetyAttestation : 1 ItemName : OWC 16GB (2x8GB) DDR3 ECC Registered CL7 PC3-8500 1066MHz SDRAM Memory Ram Upgrade Module Compatible with 2009-2010 Mac Pro Nehalem, Xserve 2009 (OWC85MP3S8M16GK) ItemPackageDimensions_Height : 17.6 centimeters ItemPackageDimensions_Length : 3.6 centimeters ItemPackageDimensions_Width : 12.6 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : computer-internal-memory Manufacturer : Other World Computing MemorySpeed : 533 MHz MemoryStorageCapacity : 16 GB ModelName : Hynix Desktop Memory Kit ModelNumber : 85MP3S8M16GK NumberOfBoxes : 1 NumberOfItems : 2 NumberOfPins : 240 PackageLevel : unit PartNumber : OWC85MP3S8M16GK ProductDescription : OWC 16GB (2 x 8GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible With Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' systems and Early 2009 Xserve. Product Specs: Size: 32GB (4 x 8GB) (8192MB), 240-pin, SDRAM DIMM, 1024M x 72, Dual Rank ECC Registered Memory Module, Data Rate = 1066MHz, Module Bandwidth 14.9GB/s, CL13, Voltage 1.5V, Specified Thermal Sensor, RoHS Certified, Warranty Safe Upgrade. OWC Memory Compatible With Mac Pro 2013 fully meets specifications with special attention to proper thermal specifications. IMPORTANT MAC PRO 2009 UPGRADE NOTE: Mac Pro 2010 models utilize thermal enabled ECC-Registered and ECC non-Registered memory. ECC Registered and non-Registered memory may not be mixed. Existing factory or post installed 4GB or 8GB ECC non-Registered modules need to be removed prior to installation of OWC 8GB, 16GB, or 32GB server grade ECC-Registered memory upgrades. ProductSiteLaunchDate : 2010-09-08T12:36:24.992Z Size : 16GB Style : 2 x 8GB SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 43201400 Voltage : 1.5 volts WarrantyDescription : OWC Memory Lifetime Limited Warranty including Advanced Replacement Program