Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Diff.between "available" and "free" physical memory?

14 Apr 2013   #11

Windows 7 Ultimate x64

Guys... I believe I have a problem:
Total: 4024
Cached: 1721
Available: 1664
Free: 1

Recently I have been having "MEMORY_MANAGEMENT" Bluescreens while gaming or using many tabs on Firefox... is this the reason? I always seem to have 0 - 160~ in the Free category and performance has become sluggish lately. Should I buy new RAM or should I just flat out replace it? Like I said, I have been having MEMORY_MANAGEMENT BSODs and I think this is the reason. I am thinking about buying another 4 GB of RAM for my system. Good idea? please help.

P.S. I am running 1333 Mhz RAM btw.

My System SpecsSystem Spec
14 Apr 2013   #12
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

Where are you getting these numbers from. Look into Resource Monitor > Memory tab. The colored bar will give you the full story.
My System SpecsSystem Spec
14 Apr 2013   #13

Windows 7 Ultimate x64

i was looking at task manager. But even in resource monitor it has limited free ram.
My System SpecsSystem Spec

14 Apr 2013   #14

Windows 7 Ultimate x64

But wait, that doesnt matter right? only "available" matters right?
My System SpecsSystem Spec
14 Apr 2013   #15
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

The 'Standby' and 'Free' in Resource Monitor are both 'available'. The standby is RAM where previously run programs are cached. The OS fetches the program from there in case you use it again. That is the fastest access possible. But that RAM will be used if a new program needs the space.

So you have to add the 2 blue areas together to obtain available RAM.
My System SpecsSystem Spec
14 Apr 2013   #16

Windows 10 Pro (x64)

Quote   Quote: Originally Posted by JimmyTryhard View Post
Recently I have been having "MEMORY_MANAGEMENT" Bluescreens while gaming or using many tabs on Firefox... is this the reason?...
The reason is not because lack of RAM. Running out of RAM does not cause a blue screen. Instead it could be an error in the system, for example bad memory.
My System SpecsSystem Spec
14 Apr 2013   #17

Windows 7 Professional 64bit SP1

For monitoring system resources, I find Resource Monitor better than Task Manager........Click Start > type Resource Monitor and there it is. It may make things a little easier to understand.
My System SpecsSystem Spec
15 Apr 2013   #18

Windows 7 Pro 64 bit

Memory management in Windows is complex and follows principles that are not obvious and may at times seem to make no sense. But there is method in the apparent madness.

Free memory: This is memory that contains no useful data. It is expensive fast memory just sitting there, consuming power and providing nothing in return. You don't want it and you don't need it. The only good thing about it is that it can immediately be taken out of unemployment and set to work. The ideal would be for free memory to be zero at all times but we aren't there yet.

Available memory: This is the sum of memory on the free list (bad), and the standby list (good). Memory on the standby list can also be immediately be put to work for any application. But what sets it apart from free memory is that it contains useful data and code, it just hasn't been recently used. This memory serves a dual role. As mentioned it can be given to any application. In addition, as it still contains the original code or data it can be given back to the original application it belonged to. In the resource manager of Vista and later you can see the values for free and standby memory. The value for standby memory should be high and free as small as possible. Standby memory also exists in XP but it takes some sophisticated tools to see it's value.

Cache memory: This is the sum of the file cache and the standby list. The file cache contains a copy of file data that has been recently accessed. If it is needed again, as often happens, it can be more quickly read from RAM than from disk. The file cache and the standby memory are both a form cache so it makes sense to show them together. A high value is a good thing. If an application needs more memory the size of the file cache will be trimmed if necessary.

Please note that the above is a highly simplified description of what is really a very complex process. The system memory manager will always try to assign memory where it will do the most good, and keep the unemployed free memory as low as possible.
My System SpecsSystem Spec
19 Jun 2013   #19

Win7 Enterprise 64bit

Quote   Quote: Originally Posted by cdonner View Post
Unfortunately there is a bug in Windows 7 related to NUMA (non-uniform memory architecture) that will cause issues on certain platforms when the amount of Free memory goes down. For instance, on my Thinkpad T410 with 8GB of RAM the Free memory will approach zero when I load a large VM. When I stop the VM and exit VMWare, the Free memory does not recover - the memory remains allocated by the cache.
The problem with NUMA is that it prefers to allocate memory from banks that are attached to a CPU core (hence non-uniform, i.e. not all memory is considered equal). Unfortunately, the Windows 7 NUMA bug prevents memory from being allocated that is in the Available pool in this scenario. Since I have no Free memory, the machine begins to swap madly when I restart the VM (the same or another one does not matter) and freezes up for minutes - even though there are over 4GB "Available".
So, despite of what the others have said, the amount of "Free" memory is more important than what's in the "Available" pool.
There is a hotfix for this issue:
Poor performance occurs on a computer that has NUMA-based processors and that is running Windows Server 2008 R2 or Windows 7 if a thread requests lots of memory that is within the first 4 GB of memory
Hi cdonner and all,
I don't know if you're still there after 2 years from this post .....
I have a Thinkpad T410 with Win7 64bit 5GB RAM and the same issue with virtual machines, both VirtualBox and VMWare Player, lot of available memory but VMs not starting with diagnostic reporting not enough memory.
3GB available memory and VM configured for 512MB RAM.
All was perfectly working on the same PC when it was WinXP with even less RAM (3GB).
Is there any news from this front?
I have a corporate PC and I cannot install hotfixes
I wonder if after 2 years Win7 has not yet resolved this kind of issue?
Hope to find some help, I really need to run VMs.
Thanks in advance
My System SpecsSystem Spec
23 Jun 2013   #20

Windows 7 Ultimate x64

Quote   Quote: Originally Posted by LMiller7 View Post
The ideal would be for free memory to be zero at all times but we aren't there yet.

A high value is a good thing. If an application needs more memory the size of the file cache will be trimmed if necessary.
Well, I have Windows 7 64bit and 4GB of RAM 512MB being used by on board Radeon and often have FREE memory around 15-20 and sometimes single digits but what I can' figure out (if anyone can shed some light on this) is why if I have anywhere from about 900MB -over 1GB, like 1200MB or so, I am getting constant 'Out of Memory' warnings while running Google Chrome and also the old 'Low memory' Telling my I should close 'The Program' and then it usually list 'Google Chrome' or 'Desktop Gadgets' or some offending, memory hogging program. I don't see why it would warn me I am running out of memory consider I still have around or close to 30% of the memory still available.

This problem has driven me crazy ever since I have installed Windows.
My System SpecsSystem Spec

 Diff.between "available" and "free" physical memory?

Thread Tools

Similar help and support threads
Thread Forum
Kyboard deos not respond to the keys: "e", "d", "c" and "3"
Example sentence: vrytim I prss ths kys, nothing happns. Now I'm writing with my on-sreen keyboard. I'm clueless when it comes to computer stuff. How do I fix this? Is this a software problem, or a hardware problem?Help is much appreciated!
Hardware & Devices
Changing the "minimize" "maximize" and "close" buttons of a theme
Ok so I'm using a custom visual style made by another user however I don't really like the buttons used that I mentioned above. The creator states it is acceptable to change the theme to however you like as long as you don't redistribute it anywhere. Ok so I opened up the .msstyles file (using...
BSOD every few hours: mostly "STOP: 0x00000F4", "c00021a" & "c0000135"
Hi everyone! Yesterday my HP laptop (Windows 7) started getting BSOD with various types of errors (mostly "STOP: 0x00000F4", "STOP: 0x0000007A", "c00021a" and one "missing %hs, c0000135"). Most of the time it restarts without any issues and works fine right after the BSOD and then an hour or two...
BSOD Help and Support
Need to add "TASKBARS" (MSese for "Launchpads", "Docks" NOT "Toolbars"
My office just upgraded, and I can no longer use Windows XP. On this system, I was able to add a separate taskbar to facilitate quick access to commonly-browsed folder locations on our vast network, and another one expedited the launching of useful programs and lists. Each task on each taskbar...
General Discussion
"Physical memory dump" error message
Hey guys. I'm using Windows 7 in an ASUS 1005HA netbook. I am getting a "physical memory dump" error message everytime I connect an external DVD drive. How do I fix this? What information do you guys need? Thank you in advance.
BSOD Help and Support

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 14:05.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App