Product Detail Sold Individually . The "Dell - Memory - 2 GB - DIMM 240-pin - DDR2 - 800 MHz / PC2-6400 - unbuffered - non-ECC" is best product for you. We recommended Dell - Memory - 2 GB - DIMM 240-pin - DDR2 - 800 MHz / PC2-6400 - unbuffered - non-ECC