The first rule for ram is to buy enough.
Enough might be hard to define.
Since you now have a running system, load it up and look at task manager memory tab.
Find the hard fault page rate. If you have enough ram, the rate should be zero.
A hard fault is when windows needs a page and it is not in ram.
The correct page needs to be swapped in from the page file.
Windows keeps unused code in ram in anticipation of possible quick reuse.
A simple % used does not tell the story.
Here is an older study on ram speed scaling:
Armed with a massive 32GB high-end Kingston HyperX Predator DDR4-3000 memory kit, we investigate how DDR4 frequencies and latencies affect real world performance on Intel’s latest mainstream desktop platform. October 13, 2015 by Lawrence Lee Product Kingston HyperX Predator DDR4-3000 32GB...
silentpcreview.com
The conclusion is that so long as you are running dual channel, ram speed means little for Intel.
Your CAS 15 is one of the better 3000 speed kits.
Your motherboard will support much faster speeds.
But, you would not be able to tell the difference without a synthetic benchmark.
m.2 is a size format, about like a stick of gum.
It is a storage drive that is nowhere as fast as actual ram.
Not applicable here.
If you had an app that needed ultra fast performance from a hard drive, there are apps that can use ram as virtual disks. Such specialized use might be one good reason for up to 256gb of ram.
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