memory type used 2002–2004, commonly known by names ranging from DDR-200 / PC-1600 through DDR-500 / PC-4000. DDR2 DDR2 SDRAM (Double Data Rate 2)  240-pin SDRAM memory type used 2004–2008, commonly known by names ranging from DDR2-400 / PC2-3200 through DDR2-1200 / PC2-9600. DDR3 DDR3 SDRAM (Double Data Rate 3)  240-pin