100% Genuine- Computer/Laptop Replacement or Internal partsPart Number: 49Y1407 (055) Product Type RAM Module Technical Information Memory Size 4 GB Memory Technology DDR3 SDRAM Memory Voltage 1.35 V Number of Modules 1 x 4 GB Memory Speed 1333 MHz Memory Standard DDR3-1333/PC3-10600 Error Checking ECC Signal Processing Registered CAS Latency CL9 Physical Characteristics Number of Pins 240-pin Form Factor DIMM Thickness 150 mil Width 1.2" Length 5.3"Note:Picture may not match actual product. Please ensure that your original part number matches this exactly, or check with the manufactuer for compatiblity. Customers are responsible for compatiblity.