What is a benefit of DDR4 memory?

A.
new encoded chip scheme

B.
lower energy consumption

C.
compatible with DDR3

D.
larger cache buffer size

Explanation:

The main notable improvements that DDR4 makes over its predecessor, DDR3, are a greater range of available clock speeds and timings, lower power consumption, and reduced latency.
References: http://www.howtogeek.com/238990/whats-the-difference-between-ddr3-and-ddr4-ram/