The Approved Memory MA686G/A-AM 4GB desktop RAM module offers memory speed of up to 667 MHz for a faster, efficient computing experience. With DDR2 memory technology, this module ensures data integrity and reliability. Featuring a DIMM 240-pin fully buffered form-factor, this RAM module helps you to boost up the performance of your system and ensures seamless operation. This dual rank module offers ECC error checking to prevent data loss..Signal processing: Fully buffered.Dual rank RAM for easy and fast access of data.DDR2 SDRAM technology for high-performance solution.Form factor: DIMM 240-Pin.Capacity: 4GB (Two 2GB).Dimensions: 3.8"W.667 MHz memory speed delivers faster clocking rate.Memory standard: DDR2-667/PC2-5300.Desktop RAM module is compatible with Apple Mac Pro workstation.Data integrity check: ECC