Micron MT16HTF25664AY-800J1 4GB 2 x 2G PC2-6400U DDR2 800 Non-ECC DT Memory Kit Manufacturer: Micron MT16HTF25664AY-800J1 Memory Type: 240 Pin DDR2 SDRAM Capacity: 4GB 2 x 2G Bus Type: PC2-6400U 800Mhz Cas: CL6