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Product Specs: 8GB (8192MB) : 240-pin SDRAM DIMM 1024M x 72, Dual Rank ECC-R Memory Module : Data Rate = 1333MHz : Module Bandwidth 8.5GB/s : CAS 9-9-9-24 : Voltage 1.5V : Apple Specified Thermal Sensor* : RoHS Certified : Free Installation Videos & Manuals : OWC Memory Lifetime Limited Warranty including Advanced Replacement Program : OWC Memory for Mac Pro Quad Xeon fully meets Apple's specifications with special attention to proper thermal specifications. IMPORTANT OWC NOTE: OWC p/n OWC1333D3MPE8GB (8GB modules) and OWC1333D3MPE16G (16GB modules) require that all installed modules be of the same p/n OWC 8GB and/or 16GB modules. Other existing Apple or 3rd party 1GB, 2GB and 4GB modules are not supported for use with these kits and need to be removed when these modules are added.