What is a RAM cache, and how do you clear it on Windows?

A RAM cache is file data that Windows keeps in spare memory so it can reopen files and apps without reading the disk again, and a restart is the simplest way to clear it.

This guide explains what the Cached figure in Task Manager means, when clearing it is worth doing, and the Microsoft tools that clear it safely on Windows 11 and Windows 10.

Clear RAM cache on Windows 11 and 10 by restarting the PC

RAM loses its contents when the power cycles, so a restart empties the file cache, the standby list and every app's working set at once.

Microsoft lists this as a basic performance step: close what you do not need, then restart.

1. Save your work and close any apps and browser tabs you are not using.
2. Select Start.
3. Select the Power button.
4. Select Restart, not Shut down.
5. After you sign in, open only the apps you need, then check the Cached figure in Task Manager.

What is a RAM cache?

Windows caches file data that it reads from and writes to disks in an area of RAM called the system file cache. Reads come from that memory instead of the drive, which is far faster.

When the cache no longer needs a block, the page moves to the standby list. Standby pages still hold the data but count as available memory, so Windows hands them to any app that asks.

Term	What it means on Windows	Can apps use it?
System file cache	File data held in RAM under the Cache Manager, which runs the whole time Windows is on	Yes, Windows trims it when apps need memory
Standby list	Cached pages that are not in active use but still hold valid data	Yes, it counts as available memory
Modified list	Pages changed in memory that still have to be written to disk	After they are written, they move to standby
Free and zero lists	Pages that hold no useful data	Yes, immediately
Cached (Task Manager)	File cache plus the modified and standby lists added together	Mostly yes; only the modified part waits for a disk write

RAM cache vs. app cache vs. disk cache

Three different things share the word cache, and clearing one does nothing to the others.

Cache	Where it lives	What fills it	How it is cleared
RAM cache	Physical memory	Windows, from files you open, copy or run	Restart, sign out, or RAMMap; Windows also trims it automatically
App cache	Files on your drive inside an app's data folder	Browsers, Microsoft Store, Teams and similar apps	The app's own clear-cache option
Disk cache	Memory chips on the SSD or hard drive itself	The drive's firmware	Managed by the drive; there is no user setting to empty it

A browser cache is an app cache: you clear the Chrome cache from Chrome, and doing so frees drive space, not RAM.

How Windows uses RAM cache

Windows treats empty RAM as wasted RAM. It fills spare memory with recently used file data and gives it back the moment an app needs more.

Data written to a file also lands in the cache first. The Cache Manager writes it to disk later, a method called lazy writing.

Stage	What Windows does	Task Manager figure it affects
You open a file or app	Reads the data from disk into the system file cache	Cached rises
You close it	Keeps the pages on the standby list in case you need them again	Cached stays high, Available stays high
An app asks for memory	Repurposes standby pages first, oldest and lowest priority first	Cached falls, In use rises
You save a file	Writes into the cache, then flushes to disk at intervals	Modified pages rise, then return to standby
Memory runs short	Moves rarely used modified pages to the page file	Committed approaches the commit limit

Should you clear the RAM cache?

Usually not. A large Cached figure with plenty of Available memory means Windows is working as designed.

What you see	Do this	Why
Cached is high, Available is high, PC feels fine	Leave it alone	Standby memory is already free for apps to use
Cached is high, PC is slow, Available is near zero	Find the app holding memory, then restart	The cache is not the cause; something is using RAM
Committed is close to the commit limit	Close apps or add RAM	Clearing cache does not lower committed memory
You are benchmarking a drive or app	Empty the standby list with RAMMap before each run	Removes cached data so every run reads from disk
You just closed a heavy game or editor	Do nothing	Windows reuses that memory on demand

How to check RAM cache in Windows

Task Manager shows the cache on its Performance tab, so you can check it before and after you clear it.

1. Press Ctrl + Shift + Esc to open Task Manager.
2. Select More details if Task Manager opens in its small view.
3. Select the Performance tab, then select Memory.
4. Read Cached: file cache plus modified and standby pages.
5. Read Available: free memory plus standby pages that apps can claim.
6. Read Committed: memory promised to apps against the limit of RAM plus page file.
7. For a per-list view, open RAMMap and check the Use Counts tab, which splits memory by type and by standby, modified and free lists.

After a restart or a RAMMap empty, Cached should drop and Free should rise. Both return to normal as you work, which is expected. You can also check how much RAM is installed on the same Memory page.

The safest ways to clear RAM cache on Windows

Every route below uses Windows itself or a Microsoft tool. None of them deletes a file.

Method	What it clears	Best for
Method 1: Restart your PC	All cached memory and every app's working set	Everyday use; the simplest option
Method 2: Close memory-heavy apps and background processes	Memory those processes hold; Windows releases their pages	A slow PC with one obvious heavy app
Method 3: Use Microsoft RAMMap to empty standby memory	The standby list and other lists you pick in the Empty menu	Benchmarks and testing without a reboot
Method 4: Sign out and sign back in	All processes in your user session	Shared PCs, or when a restart is not convenient

Close memory-heavy apps and background processes in Task Manager

1. Press Ctrl + Shift + Esc to open Task Manager.
2. Select the Processes tab.
3. Select the Memory column header to sort apps by memory use.
4. Save any open work in the app at the top of the list.
5. Right-click the app and select End task.
6. To sign out instead, select Start, select your account picture, then select Sign out.

Never end processes you do not recognise, such as System or Windows Explorer; that can freeze the desktop.

Use RAMMap to clear memory cache

RAMMap is a free Microsoft Sysinternals tool by Mark Russinovich that maps how Windows uses physical memory. It runs on Windows Vista and later and is published on Microsoft Learn and in the Microsoft Store as part of the Sysinternals Suite.

Its Empty menu removes pages from the working sets and memory lists, which is how testers get a cold cache without rebooting.

1. Get RAMMap from its page on Microsoft Learn (learn.microsoft.com/sysinternals) or the Sysinternals Suite in the Microsoft Store.
2. Right-click RAMMap and select Run as administrator.
3. Open the Use Counts tab and note the Standby total.
4. Open the Empty menu and choose the command that empties the standby list.
5. Press F5 or select File > Refresh, because RAMMap does not update on its own.
6. Confirm the Standby total has dropped on Use Counts.

The next file you open loads from disk instead of memory, so the first launch of each app will be slower until the cache rebuilds.

How to reduce RAM cache problems without constantly clearing it

If memory runs short every day, fix what fills it rather than emptying the cache on a schedule.

1. Disable unnecessary startup apps: in Task Manager select Startup apps, right-click an app you do not need at sign-in and select Disable.
2. Update Windows and device drivers: select Start > Settings > Windows Update > Check for updates, and install optional driver updates listed there.
3. Check for memory leaks: sort the Processes tab by Memory and watch whether one app keeps growing over hours. Update or reinstall that app.
4. Increase virtual memory if needed: keep the page file system managed, so Windows grows it when committed memory reaches 90 percent of the limit. Press Win + R and run SystemPropertiesAdvanced to reach the performance settings that hold it.
5. Add more RAM if Committed regularly sits near the limit with only your normal apps open.

Mistakes to avoid when clearing RAM cache on Windows

Do not	Why
Do not use random "RAM cleaner" apps	They force out the same standby pages Windows already reuses, so apps reload from disk and run slower. Microsoft's own RAMMap does this when you need it.
Do not disable SysMain just to reduce cached memory	SysMain is the Windows SuperFetch service. Standby memory is already counted as available, so switching a service off does not give apps more RAM.
Do not obsess over low free RAM	Low Free with high Available is normal: the difference is cache waiting to be reused.
Do not delete system files to clear RAM	Files in Windows folders are not the RAM cache. Deleting them can stop Windows from starting and frees no memory.
Do not turn off the page file	The commit limit is RAM plus page files; removing it lowers the limit and can make apps freeze or crash.

Clearing RAM cache vs. clearing storage cache

Clearing RAM cache changes nothing on the drive. Clearing storage cache frees disk space but does not change the Cached figure.

	RAM cache	Storage cache
Where it is	Physical memory	Files on the drive
Survives a restart	No	Yes
Main tool	Restart, sign out, RAMMap	Storage Sense, Temporary files, Disk Cleanup, app settings
What you gain	A cold cache for testing; rarely any speed	Free disk space; fixes for corrupted app caches
Typical reason	Benchmarking, troubleshooting	A full drive, a broken app such as Microsoft Store

When an app misbehaves, its own cache on disk is the usual suspect. You can reset the Microsoft Store cache from the Store itself, and Storage Sense under Settings > System > Storage removes temporary files.

When clearing RAM cache actually helps

Situation	Does clearing help?	Better fix
Example: benchmarking an SSD	Yes. Emptying the standby list makes every test read from the drive, not from memory.	Empty the standby list in RAMMap before each run
Testing app launch time	Yes, for cold-start measurements	Restart or empty the standby list between runs
A game stutters after hours of play	Rarely; the cache is reused on demand	Close other apps, update graphics drivers, check Committed
Available memory near zero	No; the cache is already gone	Find the process using memory in Task Manager
PC slow right after startup	No	Disable startup apps

Quick troubleshooting checklist for high cached RAM on Windows

Why is my RAM cache so high?

Windows keeps recently used file data in spare memory on purpose.

1. Open Task Manager with Ctrl + Shift + Esc and select Performance > Memory.
2. Compare Cached with Available.
3. If Available is also high, take no action; the cache is free memory with useful data in it.

Why does my RAM cache build up over time?

Every file you open, copy or run adds pages to the standby list until memory is full.

1. Note which tasks preceded the growth, such as large file copies or games.
2. Restart once and watch whether Cached climbs back with the same work.
3. If it does and the PC stays responsive, the build-up is normal caching.

Half of my RAM is cached and the PC is slow

Another process is usually holding memory, or committed memory is near its limit.

1. On the Processes tab, sort by Memory and close the heaviest app you do not need.
2. Check Committed on the Performance tab against its limit.
3. If one process keeps growing, update or reinstall it.
4. Restart the PC to clear what remains.

Cached RAM stays high right after clearing it

Windows refills the cache as soon as apps read files again.

1. Press F5 in RAMMap to refresh the view.
2. Close apps that read files constantly, such as sync or backup tools, before you test.
3. Accept a quick refill as proof that caching works.

RAM cache on Windows FAQ

What is cached RAM?

Cached RAM is memory that holds file data Windows read or wrote recently, plus standby and modified pages. Task Manager shows it as Cached. Most of it is available to apps the moment they need more memory.

Why is my RAM cache so high?

A high RAM cache means Windows has used spare memory to keep recently opened files ready. It is normal and harmless while Available memory is also high, because Windows gives cached pages to apps on demand.

Why is so much RAM cached?

Windows fills unused RAM with file data rather than leaving it empty. Copying large files, running games or editing video adds a lot to the cache, and the pages stay until another app needs the memory.

Why is half of my RAM cached?

Half of RAM showing as cached usually reflects recent heavy file activity. If the PC is responsive and Available memory is high, nothing is wrong. If it is slow, look for a process using memory in Task Manager.

Why does my RAM cache build up?

The cache grows because every file Windows reads goes onto the standby list and stays there until memory is needed. Growth over a day of use is expected, and a restart resets it to a low starting point.

Is cache a type of RAM?

The word cache covers several memories. The RAM cache is part of normal system RAM, while CPU cache is separate, faster memory built into the processor. Drives also have their own small cache chips.

Is RAM and cache the same thing?

No. RAM is the system memory that holds running apps and data. A cache is any store of recently used data kept for quick reuse; Windows keeps its file cache inside RAM, and processors have their own cache.

Why is cache faster than RAM?

CPU cache sits on the processor itself, right next to the cores, so data travels a much shorter path than it does to RAM on the motherboard. It is also far smaller, which keeps lookups quick.

Is it safe to clear the RAM cache?

Yes. Restarting, signing out or emptying the standby list with Microsoft's RAMMap deletes no files. The only cost is that apps load from disk again until Windows rebuilds the cache.

Do I need a RAM cache cleaner for Windows 11?

No. Windows 11 reuses cached memory automatically, so a third-party RAM cleaner only throws away useful data. A restart or Microsoft's RAMMap covers every legitimate reason to clear the cache.

Should you clear RAM cache on Windows? Bottom line

Leave the RAM cache alone in daily use, restart when the PC feels sluggish, and use Microsoft's RAMMap only for benchmarks or testing. Cached memory already counts as available, so clearing it rarely speeds anything up; real slowdowns come from apps holding memory or committed memory near its limit, which Task Manager shows.