The system does not see all the RAM. Windows or BIOS does not see RAM Installed memory RAM 8 available 4

Question: Installed memory 8GB (3.97GB available)

Windows began to use half of the memory, before which all 8 GB were used. The problem is, I don’t know when and under what circumstances this happened, because I haven’t used the computer for about a month.
MotherMemory

4x Samsung PC10600 1333MHz 2 GB each

I rearranged them in places, checked each one separately, wiped the contacts with cologne, played with memory remap, reset the BIOS with a jumper, took out the processor, clicked on MemOK, in general I tried a lot of things from other forums. And yes, the checkbox in msconfig is disabled.
Such a trick, when you take out a die from the second slot, i.e. I left three sticks in slots 1,3,4, the system began to see and use all 6 gigs. So it goes. Maybe someone knows the solution?
Tried to monitor

Answer: Thanks everyone, the problem has been resolved. I still didn’t understand what it was, because after two hours of rearranging memory dies in different combinations, I managed to find one in which the system turns on and all the memory is used. In general, apparently the connectors are dying, it’s better not to touch them again.

Question: Windows 7 x64 with 8GB RAM (3.99GB available)

Computer parameters:
Motherboard - Asus p7h55
Processor - Xeon x3440
RAM: 2 sticks of 4 GB
PSU at 450w
Hard drive, floppy drive and all the goodies.

Windows 7 Professional x64 system. In the system properties, 8GB is displayed, but only 3.99GB is used. Everest also sees 2 4 GB sticks, but only 3.99 GB is actually used. I have already tried a bunch of methods: through msconfig I unchecked the “Maximum memory” item and through the BIOS in the “Memory Remap Feature” item I set “Enable”, I swapped the strips (in different sequences), I wiped the contacts on the memory. The result is the same - nothing happens. What's the problem anyway? How should it be decided? I have looked at so many topics here and on other forums - nothing helps.

Answer:

Message from persen27

I asked about amdeshnoy just in case. The dog is buried in
So change that one

Thank you, I'm already taking steps to replace it. I hope everything will be successful!

Question: Additional memory is not available (ASUS P7H55-V)

Friends, we really need your help.

I have an ASUS P7H55-V motherboard, which worked for several years with 4GB of RAM (2 dies of 2GB each)

Today I bought 2 more similar dies, inserted them, Windows sees them, but the memory is inaccessible.

The installed memory is displayed as 8.00GB - and the available memory is 3.97GB

Windows 7 (Ultimate, X64) - tried reinstalling (from another disk), no result

New dies are 100% working (I took out the old ones, ran them only on new ones - everything works)

The BIOS sees only 4096 available memory (I updated the BIOS but it didn’t work)

In boot parameters (MSCONFIG) - all checkboxes are unchecked

Processor Core i5-750 OEM<2.66GHz, 2.5 GT/s, 8Mb, LGA1156 (Lynnfield)

Old memory DDR3 4096Mb (pc-10600) 1333MHz Kingston, Kit of 2

New memory KINGSTON VALUERAM KVR13N9S6/2 DDR3 - 2GB 1333, DIMM, Ret

I swapped the dies - no result

I reinstalled Windows, updated the BIOS, reset settings, swapped plugs - no result, please help with advice

The motherboard supports 16GB of RAM - that's definitely not the problem...

Answer: In general, does any strip separately (that is, insert only one strip) in any slot work?
If all else fails, change the new memory to a normal one, 8 or 16 chip. The kind of Kingston you bought is generally unknown where it is used.

Question: Out of 8Gb of RAM, 3.19Gb is available

Hello, dear forum users! After many hours of “smoking” the forum, I still haven’t found an answer to my question. Computer config:

• OS Windows 7 Prof 64 bit
• Motherboard MSI A88XM-E35 (MS-7721)
• Perc AMD A8-5600K
• RAM: one Crucial 8Gb stick (CT102464BA160B.C16)

I specifically installed 8 gigs on my work computer, since I need at least 4 when working. After a week of using the computers, I noticed the brakes, which seemed strange to me, especially since I installed an SSD under the system. I went into the task manager and saw that 95% of the memory was used. I immediately looked into the computer properties and saw the following entry: Installed memory (RAM): 8.00 Gb (3.19 Gb available). In the resource monitor, in the "Memory" tab, it says that 4923 megabytes are reserved by the equipment. I understand that the built-in video core takes 750 meters, this is written in the characteristics of the processor. Aida also says that the memory is only 3269 meters, but in the memory characteristics it states that the bar is 8 gigs.
And I began to surf the Internet... After reading numerous posts, I performed all the actions that were possible. It doesn't lead to anything. Once a slot change resulted in “only” 2.5 gigs being reserved, and then only until the computer was rebooted.
Further more. I began to suspect incompatibility between the memory module and the motherboard, but a visit to the MSI website dispelled my doubts. I dug into the BIOS (everything seems to be in Russian, but everything is illogical), but there are no real memory settings there, except for changing the frequency and delays. Well, I started trying to play with the frequency... The memory is 1600, and it also starts, I set it to 1866 - it started normally, no changes. Then I put 2133, the motherboard did not pass the post. I don’t give up, I try again - voila, Windows has loaded, I go to the computer properties and see all the memory available! But after a few seconds, error windows and a blue screen begin to appear. I didn’t immediately pay attention to the properties of the hardware when going through the post, but then I noticed that it writes 4 gigs of memory, and when the frequency increases to 2133, it sees 8 gigs, but it doesn’t work stably. I can't raise the voltage. I don’t know what to do, there is no way to check on another mother yet. According to information, the memory is compatible with this motherboard, where should I dig next?

Answer: Hello, I had the same problem, nothing helped, I have clicl bios 2 like you, what helped was that I installed 1600 hertz RAM in the OC settings in BIOS 2 button on the left. Good luck

Question: There is less RAM than there should be

People are interested in the question. Let’s say I have 8 GB of RAM on my computer and it’s Windows 10 64-bit. And when I open the properties of my computer, it says that it is installed: 8 GB of RAM (7.78 available). Question: why is 7.78 available and where does the remaining 0.22 GB of RAM go?

And if you open htop on ubuntu 16.04 64-bit, then it generally says Mem: 7.58
Why can't I use all 8192 MB of RAM? And why do different operating systems have different amounts of RAM available?

Answer:

Message from krazy2013

Built-in video eats up memory

Right

Message from krazy2013

but smoothly. 256, 1024mb....

Dynamically bites off as much as needed at the moment and bites off
outZone, publish the config, right?

Question: 6 GB - 3.18 GB available

Guys, I have a Sony Vaio laptop with 6 GB of RAM (2 and 4) 2.8 reserved hardware! so I inserted the 1st strips, in the 1st slot there is a black screen (2 and 4), the 2nd slot works fine (2 and 4) reserved. apparatus. ~800mb. With 2 laptop sticks, the system starts up and shows 6GB (3.18 available). PS There is no checkmark for maximum memory.

Answer: I guess thanks. I thought the BIOS would be reinstalled, I found the original one, when I tried to install it, it says: this program is already installed; reinstallation is not required.

Question: The computer does not see all the memory:wall:

Assembled a computer (percentage: Intel core i5 760
board: Asus P7H55-M
RAM: Crucial DIMM DDR3 2x2
video: Nvidia GeForce GT 640 MSI)
The problem is this: Installed memory: 4 GB (1.97 available), surfed the forums, did everything possible. In msconfig, uncheck the box, change the Memory Remap value to enabled in the BIOS, update the BIOS, remove the battery. A problem arose when I rearranged the strips themselves, the monitor did not light up in all positions except
1 -
2 +
1 -
2 +

Nothing helps.

Updated: 01/01/2020 Published: 06/15/2018

Description

The system detects less RAM than is installed in the computer.

Or not all memory is available to the system:

Also, the BIOS may not detect its entire volume (more often than not, only half).

Cause

1. Part of the memory is taken by the video card.
2. The edition or bit limit of the operating system.
3. Software limitation.
4. Memory reservation by the system.
5. RAM malfunction.
6. Processor-side limitation.
7. BIOS error or need to update it.
8. The maximum volume limit that the motherboard supports.
9. The motherboard does not support one of the memory modules.

Solution

1. Using the built-in video card

This problem is characterized by insignificant memory allocation for the video adapter. In this case, we will observe a slight decrease in available memory, for example:

Any video card integrated into the motherboard consumes system memory, since it does not have its own resources.

To understand which video card is used, you can go to the device manager (command devmgmt.msc) and expand the section Video adapters:

Typically, NVIDIA and AMD adapters are discrete (not integrated), while Intel adapters are integrated.

If we want the built-in video card to consume less memory, go to the BIOS/UEFI and find one of the parameters:

• Share Memory Size
• Onboard VGA Frame Buffer
• Display Cache Window Size
• On-Chip Video Window Size
• Onboard Video Memory Size
• Internal Graphic Mode Select
• Integrated Graphics Share Memory

* in different BIOS versions they may be called differently. It is also possible that other parameters may be used - in this case, you need to study the documentation for the motherboard or use a search engine.

Then we change the amount of memory reservation for the required video systems:

2. Software limitation

The restriction can be set in the system. To remove it, open the command line and enter the command msconfig- the “System Configuration” window will open (you can also use the Windows search by the window name).

In the window that opens, go to the tab and click on Extra options:

Check that the checkbox is not checked Maximum memory or not worth a value less than the volume. Otherwise, just uncheck the box:

3. Operating system limits

Different editions of the Windows system have limitations on the maximum amount of memory used.

a) All 32-bit versions can use a maximum of 3.25 GB of RAM. This architectural limitation is the limit of what a 32-bit system is capable of. The picture will be something like this:

To use more than 3 GB of memory, you need to reinstall the system to the 64-bit version.

b) Windows editions also have limitations. For example, Windows 10 Home 64 bit will allow you to use 128 GB, and Windows 10 Pro x64 will allow you to use 512 GB. With Windows 7 the situation is worse - the home basic edition will allow you to use only 8 GB, and the initial edition only 2 GB.

More details in the tables:

OS	Limit, GB
	32-bit	64-bit
Windows 10 Home	4	128
Windows 10 Pro	4	512
Windows 8	4	128
Windows 8 Enterprise	2	512
Windows 8 Professional	4	512
Windows 7 Starter	2	2
Windows 7 Home Basic	4	8
Windows 7 Home Premium	4	16
Windows 7 Professional	4	192
Windows 7 Enterprise	4	192
Windows 7 Ultimate	4	192

If our problem is related to the edition limit, we need to update the system or reinstall it.

4. Setting up the basic I/O system

In order for the computer to use all the memory, in some cases, BIOS/UEFI settings may be required:

5. Checking the fastening of modules or rearranging memory sticks

The memory stick may not be connected to the slot on the motherboard tightly enough, which is why it will not be used by the computer. In this case, we will observe a shortage of a large amount of memory (per module). We try to insert it more tightly into the connector. When installed correctly, the module should make a clicking sound.

Sometimes, swapping memory modules helps. We simply disassemble the computer, take out the modules and swap them.

In some cases, the slot on the motherboard may be faulty. If there are free connectors, you can try to use them. It is necessary to use slots of the same color.

6. Maximum volume that the motherboard supports

It is necessary to check what is the maximum volume that the motherboard itself can see. To do this, you should use the instructions - it is included in the kit, and you can also download it from the manufacturer’s website. Also, similar information can be found on some online stores:

Some equipment (usually already outdated), in principle, does not support large amounts of memory. For example, the ASUS K50 laptop according to the specification supports 4 GB, however, official technical support states that it will only see 3 GB.

7. Problem with BIOS/UEFI

Since BIOS/UEFI is responsible for collecting information about the computer, the problem may occur at the initial stage of turning on the PC.

First, let's try resetting the settings. To do this, disconnect the computer from the power source and remove the battery for 20 minutes (you can try for the first time, 10 seconds). If this does not help, update the BIOS.

8. Memory module malfunction

In the event of a memory failure, the system and BIOS will not display its entire volume (usually only half). For example, if 16 GB are inserted into the computer (2 8 GB sticks), we will only see 8.

In this case, you can try to remove and reinsert the memory sticks (you can blow some dust out of them). Also, the slats can be swapped. You can also try cleaning the contacts (a regular eraser will do). Some laptops or all-in-one computers have a separate cover, by opening which you can get to the memory modules, otherwise you need to completely disassemble the computer.

If this does not help, run a memory test. In the case when the test also shows part of the memory, we try to pull out both sticks and insert them one at a time - if the computer does not turn on with one of them, this faulty stick needs to be replaced, if the computer starts with all the sticks, perhaps we are dealing with a problem BIOS (step below).

9. Discrete graphics card

It was already indicated above that the built-in video card takes up part of the memory for its work. A discrete card, in some cases, can also take up system memory as so-called “swap memory”. This happens at a time when it does not have enough of its own memory (most often, after overclocking or launching demanding games/applications).

To solve the problem, try the following:

• If the card has been overclocked, we return the old parameters.
• Reinstall the video card driver.

Also, some laptops may use two video cards - built-in and discrete. If the application is not demanding on the graphics adapter, then the laptop will run on the built-in video card, taking up memory resources. Alternatively, in the BIOS settings you can enable priority for using a discrete video card.

10. Processor limitations

Each processor has its own limit on supporting the maximum amount of RAM. You need to go to the official website of the developer and check what maximum volume our processor supports.

11. Module support from motherboard side

If you purchased additional memory and it is different from the second stick, you need to make sure that the motherboard supports the new module.

This can be done on the official website of the motherboard manufacturer - go to the support section and find the compatibility sheet. Among the list of equipment, you need to find the purchased memory.

12. Cleaning modules with an eraser

If the problem appears on its own, you can try to remove the memory modules from the motherboard and clean their contacts with an eraser. Afterwards we blow out the connectors on the motherboard and insert the memory into place.

13. Installing the driver for the chipset

Updating or reinstalling the driver may also help resolve the issue. To do this, we determine the manufacturer and model of the motherboard, go to the manufacturer’s website, find the page for the specific model and download the driver for the chipset. Install the downloaded driver and restart the computer.

Also, the driver can be installed semi-automatically using the DriverHub program.

14. Adjusting timings

If the computer is equipped with sticks with different timings, the memory controller automatically adjusts the necessary parameters, usually focusing on the indicators of the slowest one. But it happens that the controller cannot select the optimal settings. This leads to the fact that one of the modules does not work correctly and its memory capacity is not used.

To set timings, go to BIOS/UEFI and find the memory settings option. Depending on the type of firmware, its version and manufacturer, these settings may vary greatly. You need to find instructions for the BIOS/UEFI version you are using to change the timing parameters and set those that correspond to the slowest memory module.

15. Disable virtualization

In some cases, enabled virtualization technology may have an impact on maximum memory support. To check this option, we try to disable it.

Disabling virtualization support occurs in the BIOS in a section with a name similar to CPU or CPU Configuration. This section is usually located in the subsection Advanced. Depending on the processor used, the virtualization support option is called differently:

• for Intel processors we translate the option Intel Virtualization Technology(or Intel VT) to position Disabled.
• for AMD processors we translate the option SVM Mode to position Disabled.

Save the settings and check the memory capacity.

16. Windows license limitation

The systems that come with computers use a strict licensing policy that limits the replacement of equipment. This can lead to a situation where, when adding memory, all of it will not be recognized.

In this case, you need to reinstall the system. In this case, a simple reinstallation over the existing system will not help - only a complete formatting of the system partition with the installation of a new Windows.

If you decide to upgrade your computer by adding some RAM, it may happen that after installing it, the system will display the amount of memory that you installed, but not all of it will be available, and this is despite the fact that a 64-bit operating system is installed system.

Just recently, I had to face a similar situation. In general, to a computer that had 2GB of RAM installed, it was necessary to add another stick with the same amount of memory.

As a result, after installation, the system saw all 4GB of RAM, but it indicated in brackets that only 3GB was available. But the most surprising thing was that Windows 7 x64 was installed on the computer, therefore no restrictions should be imposed on the RAM, as is usually the case on x32.

Having started to figure it out, I eventually found a solution that helped me return my memory to its place and will gladly share it with you. Below in the article I will show what you can do if you see only 3 GB of RAM on Windows x64 instead of 4, 8 or 16 GB of RAM.

On a 64-bit system, instead of 4, only 3 GB of memory is available, what should I do?

Of course, the first thing I thought was that it was all about the system, perhaps some kind of crooked assembly was installed, but after reinstalling Windows from a licensed image, nothing changed and only 3 GB of memory was available as before.

Based on this, we can assume that the problem is in the hardware or in the BIOS settings.

Once in the BIOS, I started looking in the settings for any parameters that were somehow related to RAM.

After spending about 15 minutes turning different parameters on and off, as well as checking the results, I finally found something that helped me.

This is a parameter called " Memory Remap Feature", precisely after I changed its value from " Disable" on " Enable", in the system properties the memory began to be displayed normally, that is, all four gigabytes of RAM were now available.

How to find this parameter? Below I will show a clear example of where I managed to find this function. Of course, I understand that today there are quite a few different motherboards that have different appearances. But for now I’ll stick to my example, and then, if possible, I’ll add something new. I can recommend looking for it in the chipset settings, most often that’s where it is located.

So, we reboot or turn on the computer and enter the BIOS, let me remind you that the standard keys for entering the BIOS are “ Del And F2", if nothing suits you.

Go to the tab " Advanced" and using the navigation arrows go down to the section " Chipset" or maybe " Chipset Configurations».

The next step is to go to the “ North Bridge Configuration" By the way, many people may not have this point; if so, it’s okay, skip this step and move on.

Having reached the desired location, select the option “ Memory Remap Feature", by pressing "Enter", set the value " Enable».

Afterwards, we confirm the selected value and restart the computer, saving all the changes made, by pressing the F10 key.

If earlier on a 64-bit system you only saw 3 GB of RAM instead of 4, now everything should change and after booting the computer, the system properties will show that all 4 (or more) gigs are in use.

At least it helped me, so the advice has been tested in practice and that is why I recommend using it first of all.

What else can you do if only three gigabytes of memory are available instead of four?

Everything is clear with the “Memory Remap” function, but what should those who don’t have it do? Yes, it may be that you won’t find this item at home, especially for laptop owners.

The fact is that this function can be built into the BIOS, even if there is no such parameter there. In such cases, of course, it is recommended to use the latest version. And only after this “Memory Remap” will begin to fulfill its functions.

You can also look for the parameter “ Memory Hole" its value should be set to " Disabled».

HPET Mode Another parameter that is recommended to be checked and set to “ 64-bit».

Opening through the window " Execute».

Move to the tab "" and click on "".

And here we uncheck the “” parameter.

Apply the new settings and restart the computer.

Also, some amount of RAM can be used by the built-in video. For example, if your monitor cable is connected next to the USB ports, then you are using built-in video, therefore, for it to work fully, a certain part is taken from the total amount of RAM and transferred to the GPU, and that is why instead of 4 GB you can see that there is slightly less memory available , for example 3.5 GB. Here you will have to measure yourself or buy a discrete video card.

There is also information that even with a separately installed video card, the processor continues to take up RAM for the needs of integrated video. In this case, you need to change the processor graphics value to the minimum or disable it completely by setting the value for integrated graphics in the BIOS to Disable (PCI or Auto). After the reboot, all missing RAM should return to its place and be displayed in full.

And of course, there is a possibility that instead of the installed amount of memory you see much less due to the fact that your motherboard simply does not support, for example, more than 3 or 4 GB, but this usually happens on quite old motherboards .

As you understand, there can be a lot of reasons for displaying 4 GB of memory instead of 3 GB, and everyone’s solutions may be different. In this instruction, I showed you what really helped me and what else you can try to get out of this situation. If anything, as always, I look forward to your comments, and together we will look for the answer to your question.

On Windows 7 x64, instead of 4 GB of RAM, only 3 GB is available, how can I get the memory back?

Familiar to many users. When you call the system properties window, the full volume is displayed, but for some reason after it it is indicated that there is slightly less memory available. It’s even worse when the user knows exactly how much RAM he has installed, but only 50 percent or less is available. Why this happens and how to use the maximum amount of RAM will be discussed further. But first, let's briefly look at the main reasons for this phenomenon.

Why is not all RAM available?

So, the fact that Windows operating systems sometimes produce indicators whose values ​​are obviously less than the total amount of installed RAM may be associated with a number of reasons, among which the most significant are the following:

• A 32-bit system is installed that does not support memory more than 4 GB;
• maximum is not supported by the motherboard;
• in the system parameters there is a limit on the maximum amount of RAM used;
• Memory redistribution settings are set incorrectly in the BIOS;
• memory is partially reserved for built-in video adapters;
• there are too many active processes running;
• the installed strips are damaged, their performance is impaired, or they are connected incorrectly;
• memory usage is blocked by viruses.

It’s worth saying right away that issues related to viral exposure will not be considered in detail. Here we can advise you to just perform a scan, just in case, using portable antiviruses or similar programs that have bootloaders at their disposal.

How to use all installed memory in the simplest ways?

Much more important issues when not all RAM is available are problems with connecting memory sticks or their incorrect operation. First, make sure that the motherboard is designed for the installed volume, and also check the tightness of the insertion of the strips into the corresponding slots. It would also be a good idea to perform a memory test, for which you can use Windows' own tool (mdsched) or third-party programs like Memtest86/86+.

If problems are not identified at this stage, pay attention to the bitness of the installed Windows modification. If you have a 32-bit version, which cannot work with RAM of more than 4 GB (unless you use special tools), no matter how much memory you install above this limit, the system will still not recognize it.

The optimal solution would be to install a 64-bit version of Windows. But in this case, previously installed programs may not work, and important files will have to be copied to another logical partition or to removable media.

Sometimes it happens that not all RAM is available due to incorrectly set memory usage options in (msconfig).

In the configurator, on the boot tab, click the additional options button and check if the maximum memory checkbox is checked. If there is one, remove it, save the installed options and reboot the system.

As is already clear, part of the memory can be “eaten up” by a huge number of active background processes and services that are not visible to the user. First, disable all unnecessary components in startup (in Windows 7 and below, the corresponding tab in the configuration settings is used for this; in higher versions, “Task Manager”).

Just in case, look at the active components of the system in the programs and components section and disable the unused ones (Hyper-V module, Internet Explorer if you use another browser, print service if you don’t have a printer, etc.). Similarly, you can set the startup type to disabled for some other services (services.msc), but in this case you need to know exactly what can be deactivated and what cannot.

There is little RAM available: what settings can be changed in the BIOS?

If the problem remains after applying the solutions described above, go to the settings of the primary BIOS/UEFI systems and check the memory settings, which should contain an item containing the words Remapping or Remap (redistribution).

If you have 64-bit Windows and have more than 4 GB of memory, set it to Disabled. Otherwise it needs to be activated.

If not all RAM is available due to reserving additional space for the video card built into the motherboard, set this item to a value that corresponds to the adapter’s memory capacity (you can find it on the monitor tab when calling the DirectX - dxdiag dialog). This is done by changing the automatic detection (Auto) to one of the available options (32, 64 or 128 MB).

Patching 32-bit systems

Finally, you can use all memory above 4 GB on 32-bit systems using the ReadyFor4GB utility. First, the executable EXE file of the same name is launched from the application folder, and then the Check and Apply buttons are pressed. After this, similar actions are performed for the ntkrnlpa.exe object. The AddBootMenu.cmd file is then launched and confirmation that the command has been executed is given. After the reboot, if a menu appears with the bootloader, Windows is selected.

Note: all actions are performed solely by running files as an administrator at your own peril and risk, since system performance after using this method is not fully guaranteed.