Crucial 4GB DDR2-800 PC2-6400 240-pin DIMM FB ECC
Crucial 4GB DDR2-800 PC2-6400 240-pin DIMM FB ECC. Internal memory: 4096 MB, Internal memory type: DDR2, Memory clock speed: 800 MHz. Memory voltage: 1.8 V. Compatibility: Macintosh Pro (8-Core Xeon)