Specification Brand : Patriot Memory BulletPoint : Bullet point 1 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 : Green ColumnAddressStrobeLatency : CL17 CompatibleDevices : Laptop CustomerPackageType : Standard Packaging DataTransferRate : 2400 MHz DigitalStorageCapacity : 4 GB ExternallyAssignedProductIdentifier1 : 814914023853 ExternallyAssignedProductIdentifier2 : 0814914023853 ExternallyAssignedProductIdentifier3 : 00814914023853 ExternallyAssignedProductIdentifier4 : 0740617157352 ExternallyAssignedProductIdentifier5 : 00740617157352 FormFactor : SO-DIMM GpsrSafetyAttestation : 1 ItemName : Patriot Memory Signature Line DDR4 4GB (1x4GB) SODIMM Frequency: 2400MHz (PC4-19200) 1. 2 Volt - PSD44G240081S ItemPackageDimensions_Height : 14.1986 centimeters ItemPackageDimensions_Length : 1.1938 centimeters ItemPackageDimensions_Width : 5.4102 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : computer-internal-memory Manufacturer : Patriot Memory MemorySpeed : 2400 MHz MemoryStorageCapacity : 4 GB ModelName : ddr4 ModelNumber : PSD44G240081S NumberOfBoxes : 1 NumberOfItems : 1 NumberOfPins : 260 PackageLevel : unit PartNumber : PSD44G240081S 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 : 2017-01-01T08:00:01.000Z Size : 4gb StreetDate : 2018-05-04T00:00:01Z Style : 2 x 8GB SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 32101600 Voltage : 1.2 volts WarrantyDescription : Limited Lifetime