Originalmente acepta 8GB de RAM pero pueden utilizarse 16GB te dejo lo que pone en everymac
RAM Type: PC3-8500 DDR3 Min. RAM Speed: 1066 MHz
Details: Supports 1066 MHz PC3-8500 DDR3 SO-DIMMs. Also see: How do you upgrade the RAM in the Aluminum "Unibody" Mac mini models? How much RAM of what type do they actually support?
Standard RAM: 2 GB Maximum RAM: 16 GB*
Details: By default, 2 GB installed as two 1 GB modules.
*Originally, both the official and actual maximum RAM was 8 GB. However, as confirmed by site sponsor OWC, if running OS X 10.7.5 or higher, updated with the latest EFI, and equipped with proper specification memory modules, this model can support up to 16 GB of RAM.
In the US (and many other countries), site sponsor Other World Computing sells memory -- as well as other upgrades -- for this Mac mini.
In the UK, site sponsor Flexx sells memory and other upgrades for this Mac mini.
In Australia, site sponsor RamCity sells memory and other upgrades for this Mac mini.
In Southeast Asia, site sponsor SimplyMac.sg sells memory and other upgrades for this Mac mini.
Also see: Actual Max RAM of All G3 & Later Macs.
http://www.everymac.com/systems/apple/m ... specs.html