Kingston Technology HyperX 256MB DDR2 533MHz, HyperX. Internal memory: 256 MB, Internal memory type: DDR2, Memory clock speed: 533 MHz. Memory voltage: 1.8 ± 0.1 V. Width: 133 mm, Depth: 2.7 mm, Height: 30 mm. Operating temperature range (T-T): 0 - 55 °C