This OWC brand single 4GB DDR3 SDRAM memory module, with individual module part number OWC1333D3ECC4G 85210 1327, is perfect for upgrading your computer's memory capacity. It has a capacity of 4GB per module and comes with a total capacity of 4GB, suitable for your computing needs. The memory has 240 pins and a bus speed of PC3-10600 (DDR3-1333), making it compatible with a wide range of computers. It is an ideal choice for users who require more memory to enhance their computer's performance.