this is the ram type as quoted from the Apple support webpage...
taken from
sappork dot apple dot com
look for article HT202593
Mac mini (Late 2012): Memory specifications and upgrades
Learn which kinds of memory to use with your Mac mini (Late 2012) and Mac mini server (Late 2012).
Mac mini (Late 2012) and Mac mini server (Late 2012) computers have two internal memory slots. These slots accept standard PC3-12800 DDR3 204-pin SO-DIMMs (Small Outline DIMM) with the following specifications:
PC3-12800 DDR3
Unbuffered
Non-parity
204-pin module
1600 MHz
You can use RAM module sizes of 2 GB, 4 GB or 8 GB in each slot. For best performance, don't mix sizes of memory modules. Install two identical memory modules.
DIMMs with the following features will not work:
Registers or buffers
PLLs
ECC
Parity
EDO RAM