Hi Joshi
This is not a typo, these are our high performance configuration deployment examples. Our SAAS environments are set up like this:
The amount is very high on the PPM database as our application relies heavily on SQL transactions.
Again, these are deployment examples, not prerequisites. So if your system is smaller and you don't need a high performance environment, you can certainly use less than 100GB RAM on the PPM database.
Hope this helps -Nika