RAMMap makes answering those questions easy. RAMMap is an advanced physical memory usage analysis utility for Windows. It presents usage information in different ways on its several different tabs. Use RAMMap to gain understanding of the way Windows manages memory, to analyze application memory usage, or to answer specific questions about how RAM is being allocated. RAMMap's refresh feature enables you to update the display and it includes support for saving and loading memory snapshots.
What's new in this version:
Version 1.21 fixes a bug that causes RAMMap to sometimes report an error on 32-bit versions of Windows.