This test is just an indicator for RAM of the w3wp.exe process. It has been measured with the Windows Performance Counter "Working Set - Private". Which is the amount of memory which has been dedicated to the process. As the CLR will dedicate more memory than is required this may not be the best metric to use.
We will soon be getting results for the heap sizes which should show how much ram was actually used.
This test is done Immediately after installation.