OWC 64.0GB UPGRADE: Consists of a Two 32GB DDR3 1333MHz PC3-10600 CL9 ECC Registered DIMMs 1.5V 240-pin Memory Module with Mac qualified Thermal Sensor EEPROM 100% COMPLIANT: With JEDEC Standard Specifications, ROHS Compliant, Warranty Safe Upgrade. Designed and Tested to Meet or Exceed All MAC Specifications for Mac Pro 2013 COMPATIBLE PART NUMBERS: MT72KSZS4G72PZ‐1G1, HMT84GR7BMR4A‐H9, M393B4G70BM0‐YH9, MT72KSZS4G72PZ‐1G4, HMT84GR7MMR4A‐H9, HMT84GR7AMR4A‐H9, M393B4G70DM0‐YH9 COMPATIBLE WITH: Mac Pro MacPro 6,1 2.7GHz 3.0GHz, 3.5GHz, 3.7GHz ME253LL/A - A1481 - 2630 INCREASED PERFORMANCE: Memory Upgrades are the Most Effective and Easy Way to Boost the Performance in Your Mac Pro INDUSTRY LEADING: Consumer Friendly Advanced Replacement Program and Limited Lifetime Warranty, which Includes Free Tech Support by Other World Computing OWC 64GB (2X 32GB) PC3-10600 1333MHz DDR3 ECC-R SDRAM Memory Compatible With Late 2013 Mac Pro OWC Memory Upgrade Module Product Specs: Size: 32GB 240-pin SDRAM DIMM: 1024M x 72, Dual Rank ECC Memory Module: Data Rate = 1333MHz: Module Bandwidth 10.6GB/s: CAS 9-9-9-24: Voltage 1.5V: Specified Thermal Sensor*: Please Note: Memory modules may differ in appearance from those pictured: RoHS Certified: OWC Memory Compatible with Mac Pro Quad Xeon fully meets specifications with special attention to proper thermal specifications. *About the Specified Thermal Sensor: Ensuring maximum performance, reliability, and operational feedback -this DDR3 ECC Modules Compatible With the Mac Pro 'Nehalem' 4 Core/8-Core and 'Westmere' 6-Core/8-Core processor models feature utilization of qualified components including the inclusion of the qualified Thermal Sensor EEPROM.