Name: DDR2 Memory Module Capacity: 4GB Speed: DDR2 800MHz (PC2 6400) Number of Pins: 240 pins Voltage: DDR2 1.8V Type: Memory Module Read First The recognition on XP is approximately 3GB The recognition on Win 7 32Bit is around 2.26-4.5GB The recognition on Win 7 64Bit is about 8-16GB PC2 6400 = DDR2 800MHz (Compatible with DDR2 667MHz, DDR2 533MHz) Note: The appearance of different batches of products may vary slightly, which does not impact functionality Color: Green Material: PCB Size: Length: 13.3CM Package Contents: 1 x Memory Module Only the above package content; other products are not included. Note: Lighting and different displays may cause the item color in the picture to differ slightly from the actual product. The allowed measurement error is +/- 1-3cm.