This B&H Kit includes 32GB (4 x 8 GB) of 204-Pin SODIMM DDR3 PC3-12800 Memory Modules from Crucial Technology that help increase the speed of your notebook computers and other small form factor computing platforms. The module kit adds a total of 32GB DDR3 memory when all four 8GB modules are installed. Increasing your computers RAM enables more applications to run simultaneously without system glitches. The SODIMM modules offer 1600 MHz clock speed to deliver superior performance. The kit is Mac compatible.