Software updates always provide the latest security patch additions.
But also the odd upgrade and software features.
RAM+ seems to have been added for those power intensive tasks.
It's virtual and temporarily will use the ROM to help out with the heavy-duty processing.
Though it seems not for gaming. Suspect that would end up heating up the device too much.
I think to make use of this feature, you will need to turn on Enhanced Processing.
Either by turning on the pull down Toggle.
Or go into settings. Battery and Device Care.
Tap on Battery. Scroll down and select More Battery Settings.
Then select the toggle
Now as you may well expect, this will affect your battery life, and it will drain the battery faster.
But when you don't need it, just turn it off.
The virtual RAM will not be as quick, but then just there to help out with processing.
But for some I'm sure this will be very helpful.