SYSTEM MEMORY (DESKTOP) DDR3 1600 MHz or PC3-12800 DDR3 1333 MHz or PC3-10600/PC3-10666 DDR3 1066 MHz or PC3-8500 DDR2 800 MHz or PC2-6400 DDR2 1066 MHz or PC2-8500 DDR2 667 MHz or PC2-5300/PC2-5400 DDR2 533 MHz or PC2-4200 DDR2 400 MHz or PC2-3200 SYSTEM MEMORY (LAPTOP) DDR2 800 MHz or PC2-6400 DDR2 667 MHz or PC2-5300/PC2-5400 DDR2 533 MHz or PC2-4200 DDR2 400 MHz or PC2-3200