Asus RS720-E7/RS12 - Manual (Page 30)

Chapter 2: Hardware setup 2-10
2.3 System memory
2.3.1 Overview
The motherboard comes with eight (per CPU) Double Data Rate 3 (DDR3) Dual
Inline Memory Modules (DIMM) sockets.
2.3.2 Memory Configurations
You may install 2GB, 4GB, 8GB, and 16GB RDIMMs or 2GB, 4GB and 8GB* with
ECC/Non-ECC UDIMMs or 8GB, 16GB and 32GB* LR-DIMMs into the DIMM
sockets using the memory configurations in this section.