The Mac Mini Mid 2011 supports up to 8GB DDR3-1333 MHz of RAM officially. However, one can install 16GB DDR3-1333 MHz of RAM or DDR3-1600 MHz RAM in both amounts. The SODIMM Modules fit but simply down-clock. I have 16GB DDR3-1600 in my 2.3GHz Mid 2011 Mac Mini and it runs perfectly and passes all of the standard Apple ASD testing. If you are installing 16GB modules make sure to do memory testing because there is a higher defect rate in 8GB chips when compared to their 2GB and 4GB cousins.