Memory Type: DDR3 PC3-14900, DDR3 (ECC)
Maximum Memory: 64GB
Installation of 16GB modules requires all previous lower density modules to be removed. You cannot mix Registered and Unbuffered memory in the same system.
Memory or DRAM is the "working" memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.
video - installing memory