HP 4GB (1x4GB) DDR3-1600 Non-ECC RAM. Internal memory: 4096 MB, Internal memory type: DDR3, Memory clock speed: 1600 MHz. Operating temperature range (T-T): 0 - 85 °C, Storage temperature range (T-T): -25 - 95 °C, Operating relative humidity range: 10 - 80 %