Product Detail 1GB PC2-6400 (DDR2-800) Dual channel kit . The "G.Skill Extreme Series DDR II PC6400 Dual Channel - Memory - 1 GB : 2 x 512 MB - DIMM 240-pin - DDR2 - 800 MHz / PC2-6400 - CL4 - 2.0 - 2.1 V - unbuffered - non-ECC" is best product for you. We recommended G.Skill Extreme Series DDR II PC6400 Dual Channel - Memory - 1 GB : 2 x 512 MB - DIMM 240-pin - DDR2 - 800 MHz / PC2-6400 - CL4 - 2.0 - 2.1 V - unbuffered - non-ECC