8GB (4GBx2) DDR2 667MHz ECC FB-DIMMs for 2006 Mac Pro Models 1.1 and 2.1

8GB (4GBx2) DDR2 667MHz ECC Fully-Buffered DIMMs for the 2006 Mac Pro Models 1.1 and 2.1. Contains two (2) 4GB matched FB-DIMM memory modules that are specifically designed and SPD configured for the Mac Pro Model 1st Generation. These modules are compatible with the latest Apple Firmware. Specifications: Total Capacity: 8GB (4GBx2) Data Rate: 667MHz Bus Speed: PC2-5300 Form Factor: DDR2 ECC FB-DIMM No. of Pins: 240, 128Mx72 Dual Rank Voltage: 1.8V CAS Latency: 5-5-5 Bandwidth: 5.3GB/s Features: True DDR2 Major Thermal Tested ROHS Certified, Compliant with JEDEC specifications Watch our installation video: orclick here for Apple's installation guide (PDF.)