Physical Memory

Describes the amount of RAM (Random Access Memory) installed on your users' machines. This value represents the total amount of memory, regardless of its configuration or usage. For example, if your user has an 8GB memory stick and a 4GB stick, the value displayed here will be 12GB.

docsPlease note that the value presented here will become rounded to prevent over-polluting the chart.
This means that if, for example, a user has an integrated graphics adapter that uses RAM, the total available RAM may not end up being an integer, like 15.9GB of RAM. In this case, you will still see 16GB, rounded up from 15.9.

docsPlease also note that the page file is not taken into consideration. Only the exact physical memory is displayed.

Environment -> Physical Memory
Environment -> Physical Memory