The Corsair Mac Memory 4GB (2 x 2GB) PC3 8500 (DDR3-1066) Memory is a high-quality RAM upgrade designed for Mac computers. With a total capacity of 4GB split into two 2GB modules, this memory is perfect for boosting the performance of your system. The DDR3 SDRAM technology ensures fast data transfer speeds, and the PC3-8500 bus speed provides reliable performance. Made by the trusted brand Corsair, this memory is a reliable choice for improving your Mac's memory capacity.