Herklotzn RAM Memory Pins Desktop DDR = 184 pin Laptop DDR = 200 pin Desktop DDR2 = 240 pin DDR2 for laptop = 200 pin Desktop DDR3 = 240 pin DDR3 for laptop = 204 pin Read First XP recognition is about 3 GB The recognition of Win 7 32 is approximately 2.26 to 4.5 GB The recognition of Win 7 32Bit is about 8-16 GB Buy , please confirm which model fits your laptop, the usual models are as follows: PC2 4200 = DDR2 533MHZ PC2 5300 = DDR2 667MHZ (Compatible with DDR2 533MHZ) PC2 6400 = DDR2 800MHZ (Compatible with DDR2 667MHZ, DDR2 533MHZ) PC2 8500 = DDR2 1066MHZ The appearance and color of different batches of products may be different, not affect the use The green colour Material: PCB. Size: 7 x 3 cm Package contents: 2 RAM Only the above package, products are not included. Note: light reflection and different screens may cause the colour of the item to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.