Tweaking and limiting RAM usage of Simulation?

You would have to be running a fairly complex simulation to use all of your 32GB of RAM.  I generally find that if it starts to use something like 7-9GB of RAM, then it is starting to fail.  Of course your simulations may be bigger than mine.  Unless you are analyzing some really big stuff, the 32GB of RAM with the 40GB page file should be fine.  You can watch the memory usage as it is being solved, but I think you have to select the "See More" button or whatever it is called.

Remember that other things on your computer are also using RAM, so you don't have the full 32GB to use in your simulation.

One quick tip for making it run smoother and getting better accuracy.  In the feature tree, right click on the title of your Study and select Properties.  Then pick the Adaptive tab and use "h-adaptive", target accuracy of 98%, max loops of 5, and select Mesh Coarsening.  Also on the Options tab select Automatic for the Solver.

if you do this, windows will not be stable. it doesnt' behave well with no page file. you're welcome to try but i think your gains will be minimal and your stability will go down significantly.

what is the actual problem that you're running into with your simulations?