The product is a set of four 1GB DDR2 RAM modules that are fully buffered and designed for use with 2006, 2007, and 2008 Mac Pro computers. The RAM modules have a total capacity of 4GB and a bus speed of PC2-6400 (DDR2-800). Manufactured by Hynix in Korea, these DDR2 FB-DIMM SDRAM modules have 240 pins and provide data transfers at a speed of 667 millions of operations per second. Ideal for improving the performance and multitasking capabilities of a Mac Pro system, these RAM modules are a reliable and efficient memory upgrade option.
Hynix 4GB Total (4x1GB) PC2-6400F-555-11 DDR2 RAM for 2006/2007/2008 Mac Pro. Working pull from my 2007 2,1 Mac pro when I upgraded. Might also work in some servers that take the DDR2 FB-DIMMs, but I'm not sure what models would be compatible.