Question

you want to upgrade all the memory in your system with the fastest memory available. which of the following should you choose?
ddr4
memory that is supported by your motherboard.
ddr3
ddr3

Explanation:

DDR4 is generally faster than DDR3. Also, for memory upgrade, while motherboard - support is important, the question emphasizes getting the fastest memory. So, among the options, DDR4 is the fastest.

Answer:

DDR4