Mac Pro users demand the highest performance from their systems, especially when working with digital media applications. Corsair's Mac Memory is specifically designed for rock-solid stability in demanding digital media rich environments. Corsair Mac Memory allows users to maximize memory capacity & throughput to increase their systems performance. Mac Memory modules are Fully-Buffered DIMMs, or FB-DIMMs, which are different than the typical memory running in standard PCs. In an FB-DIMM module, the memory controller does not write directly to the memory module, but to a buffer, which then writes to the module. This buffer, the Advanced Memory Buffer (AMB) can also provide built-in error checking & correction. Built to Corsair's legendary quality & reliability standards, Mac Memory FB-DIMM modules are fully tested to ensure maximum compatibility & performance in Apple Mac Pro products. Adding system memory is one of the most effective ways to improve overall performance & Corsair's Mac Memory offers a full line of choices for upgrading your specific Mac Pro platform. FB-DIMMs require two identical modules to be installed at once for proper operation.