Full Details from Amazon.com : http://www.amazon.com/gp/product/B000SOVVUQ?tag=onigi-20
Crucial CT2CP25664AA667 4GB (2GBx2) 240-pin DIMM DDR2 PC2-5300 Memory Module
240-pin DIMMs are used to provide DDR2 SDRAM memory for desktop computers
To use DDR2 memory your system motherboard must have 240-pin DIMM slots and a DDR2-enabled chipset
Form Factor - 240-pin DIMM
Storage Capacity - 4GB
Memory Speed -- 667MHz DDR2-667PC2-5300
