RAMMap

RAMMap is a free Sysinternals utility by Mark Russinovich, published by Microsoft, that shows how Windows assigns the physical memory (RAM) of your PC. It answers questions such as how much file data is cached in RAM, how much memory is used by the kernel and device drivers, and how much each running process holds in its working set. The program is portable: it comes as a small ZIP archive, needs no installation and runs on Windows Vista and later, including Windows 10 and 11, as well as on Windows Server 2008 and later. It can also be started directly from Sysinternals Live without saving it first. The information is split into several tabs. The Use Counts tab shows memory usage by type in a color-coded bar with a legend, so it is easy to see how much RAM is active, on standby, modified or free. Other tabs list the working set of each process, the sizes of the prioritized standby lists, every physical page, the physical address ranges and the file data held in RAM. The Empty menu can empty working sets, the system working set, the modified page list and the standby lists, which helps to test how a system behaves with a cold cache.

Features:

• Use Counts: usage summary by type and paging list
• Processes: working set sizes of every process
• Priority Summary: sizes of the prioritized standby lists
• Physical Pages and Physical Ranges: per-page use and memory addresses
• File Summary and File Details: file data cached in RAM
• Empty menu for clearing working sets and standby lists
• Saving and loading of memory snapshots for later analysis

RAMMap shows how physical memory is used by processes, the kernel, drivers and the file cache on your PC.

RAMMap is not a new program, but Microsoft still maintains it as part of the Sysinternals suite, and it is useful for administrators, developers and curious users alike. The labels it uses follow the Windows memory manager terms explained in the Windows Internals book, so some background knowledge helps to read the data. Even if you do not change anything, it gives a clear picture of how Windows uses RAM in the background.