Any computer runs faster with faster RAM.
I would at least get the fastest that your board uses without overclocking.
Unless you are overclocking the CPU, there is no need to have overclocked RAM.
One other thing That you see with RAM specs is Cas Latency.
You will see the first number of 10, 9, 8, 7.. The lower the number the faster the RAM.
In other words 1600 Cas 7, is faster that 1600 Cas 8
As the Cas Latency goes down the price goes up
The whole Cas Latency number is expressed like 9 9 9 28
or a slower one 11 11 11 28.