Name:DDR2 Ram MemoryCapacity: 4GBSpeed: DDR2 800MHz (PC2 6400)Number of Pins: 240 pinsVoltage: DDR2 1.8VType: Memory RamRead FirstThe Recognition of XP is around 3GBThe Recognition of Win 7 32Bit is around 2.26-4.5GBThe Recognition of Win 7 32Bit is around 8-16GBPC2 6400 = DDR2 800MHZ (Compatible with DDR2 667MHZ, DDR2 533MHZ)Note: The appearance of different batches of products is slightly different, which does not affect the usecolour:GreenMaterial:PCBsize:Length: 13.3CMPackage Contents:2 x RAM MemoryOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.