The Simple Performance Equation: More Memory = A Faster Computer. The 4GB VisionTek Memory Upgrade Module is the ideal performance upgrade for the Mac mini and MacBook Pro that can take up to a maximum of 16GB of RAM. And it"s a great addition to expanding an iMac"s total memory. Maxing out your memory is the most cost-effective, easy DIY install solution to dramatically speeding up file transfers, app launches, and many other memory intensive tasks. Every VisionTek memory module is test certified to the JEDEC standard for assured speed and reliability. For peace of mind ownership, the upgrade comes backed by our Limited Lifetime warranty. Make your Mac better than new with VisionTek!