Question about Microsoft Windows® Vista 64-bit Business for PC

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Why doesn't my Windows® PC recognize the whole 4GB of memory I installed? Not only is there a maximum amount of memory that your computer motherboard can accept, there is also a maximum amount of memory that your operating system (OS) can accept. For instance, when you install 4GB of memory in a 32-bit Windows system (the most common version; 64-bit systems are typically used by high-end users), your system reports only 3GB or 3.5GB. First , we can assure you, there isn't a problem with the memory. While Windows allows for 4GB of memory to be addressed, it does not equate to 4GB of physical memory. Some of the memory (regardless of how much you have installed) is reserved for use by the devices that you are using, such as a graphics card, PCI card, integrated network connections, etc, meaning it is unavailable for use as normal main memory. Upon startup, your system calculates the amount of memory needed for these devices; if you haven't maxxed out the memory in your system, it's invisible to you, and all your physical memory (the installed RAM) is available for use. However if you've maxxed out the DRAM in your system, this amount will be deducted from your physical memory, so you can't use 100% of your DRAM. The maximum memory limiitation varies by operating system, For instance, the 4GB memory limitation doesn't exist in 64-bit versions of Windows. Note for Windows Vista users:
Microsoft has addressed this issue for Windows Vista with its Service Pack 1 If you have a system board that can handle more than 4GB of memory and a processor capable of handling x64 instructions and memory remapping, Vista SP1 can help. Because of Windows and the driver stacks, Windows loaded them into 'high' memory locations to avoid potential driver compatibility issues. (Meanwhile, the 32-bit versions of Windows Vista limit the total available memory to 3.12 GB.) VistaSP1 has other features to enhance your computing, so we recommend you add it, if you haven't done so already.If you are running Windows XP, you can cosmetically correct the issue by editing the Physical Address Extension settings. Memory maximums for current Microsoft® Windows OSs include: Windows Vista (32 bit) Ultimate: 4 GB,Home Premium: 4 GB,Home Basic: 4 GB,Starter: 1 GB
Windows XP (32 bit)Professional: 4 GB,Home: 4 GB,Starter Edition: 512 MB
* Certain Microsoft server operating systems can support over 4GB of memory via Physical Address Extension (PAE). Please refer to Microsoft knowledgebase article located here for more information.
Windows Vista (64 bit)

  • Ultimate: 128 GB
  • Enterprise: 128 GB
  • Business: 128 GB
  • Home Premium: 16 GB
  • Home Basic: 8 GB
Windows XP (64 bit)
  • Professional: 128 GB
  • Windows Server 2003 (64 bit)
  • Datacenter SP2: 2 TB
  • Enterprise SP2: 2 TB
  • Standard SP1: 32 GB
  • Datacenter R2: 1 TB
  • Enterprise R2: 1 TB
  • Standard R2: 32 GB Small Business Edition: 128 GB



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If yours is a PC, Windows Vsita 64 bit should recognize 4 GB RAM. Have you tried the 64 bit bootable linux? Try with that. If you see less than 4GB, then you must check your BIOS for some setting which is the setting to share to the graphics memory or some limit.

Posted on Aug 10, 2010

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Posted on Jan 02, 2017

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My pc wont boot up, led's 3&4 flash, I have renewed the RAM and the fault is still there, does anyone have a clue what the problem is?


Allan Cairnduff,
Below is the information for the 3,4 diag error.
Memory modules are detected, but a memory failure has occurred.
  • If two or more memory modules are installed, remove the modules (see your service manual), then reinstall one module (see your service manual and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
  • If available, install working memory of the same type into your computer.
  • The memory specs for this computer are listed below.
  • Type DDR3 Synch DRAM Non-ECC Memory Memory Speed 1333MHz Memory Connectors Four (MT, DT, SFF), Two (USFF) Memory capacities Up to 4GB Minimum Memory 1GB Maximum Memory 16GB(with 1333MHz speed memory)/8GB for uSFF only Memory

    The OptiPlex 790 system supports up to 16 GB of memory in the mini-tower (MT), desktop (DT), and small form factor (SFF) chassis with 64-bit operating system. The maximum memory supported in the ultra-small form factor (USFF) is 8GB. The memory speed supported is 1333MHz DDR3 memory.
    However, 32-bit operating systems can only use maximum 4GB memory address space. Certain components within the computer require address space in the 4GB range, any address space reserved for these components cannot be used by computer memory the amount of memory available to the operating system is less than 4GB.
    NOTE:
    Memory modules should be installed in pairs of matched memory size, speed, and technology. If the memory modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance.
    NOTE:
    The total amount of available memory will be less than 4GB. The amount less depends on the actual system configuration. To fully utilize 4GB or more of memory requires a 64-bit enabled processor and 64-bit operating system Thank You,
  • Dell-Jesse L

May 15, 2016 | Dell OptiPlex 790 USFF

1 Answer

Installed 2 g memory in pavillion but only detect 512 why?


Check the advanced boot options.
1. Go to Start, in the search bar type msconfig and press enter.
2. System Configuration window will open on the screen.
3. Click on tab named "boot".
4. Click on "Advanced Options" and uncheck the box for "Maximum Memory".
After booting to Windows, check the memory displayed in system properties. 32bit versions of Windows will not recognize more than 4GB of memory. Systems with integrated video subsystems will reserve memory for video, futher reducing the available amount shown in the OS.

Mar 14, 2013 | Computers & Internet

4 Answers

What is maximum ram i can install in Asus U50F laptop and what kind


Asus U50F has 2 memory slots (204-pin SODIMM).

Each memory slot can hold DDR3 PC3-8500, DDR3 PC3-10600 with a maximum of 4GB per slot
for a total of 8 GB ram.

Mar 05, 2011 | ASUS U50F Notebook

1 Answer

Want to add ddr3 memory to my p5qc board


Hello
The motherboard supports DDR3 1333/1066/800 MHz or DDR2 memory 1066/800/667 MHz to meet the higher bandwidth requirements of the latest operation system, 3D graphics, multimedia, and Internet applications. The dual-channel DDR3/DDR2 architecture doubles the bandwidth of your system memory to boost system performance, eliminating bottlenecks with peak bandwidths of up to 19.2 GB/s.
DDR2 1066MHz DIMMs work only on the black slots for one DIMM per channel
2 x DIMM, Max. 8 GB, DDR3 1333/1066/800 Non-ECC,Un-buffered Memory 4 x DIMM, max. 16GB, DDR2 1066 / 800 / 667 MHz, Non-ECC, Un-buffered memory Dual channel memory architecture When installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended DDR2 1066MHz DIMMs work only on the black slots for one DIMM per channel. Ensure to install the DDR2 1066MHz DIMMs ONLY on the BLACK slots! Refer to www.asus.com or this user manual for the Memory QVL(Qualified Vendors Lists). When installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.
Hope this helps

Jan 19, 2011 | ASUS P5QC Motherboard - Intel P45, Socket...

2 Answers

What is the maximum memory I can install


Memory Upgrade for Acer Aspire 5630-6760 Notebook (DDR2-533MHz) Laptop, the Acer Aspire 5630-6760 Notebook (DDR2-533MHz) Laptop takes the Memory Type, and comes installed with 0MB of Memory. You can upgrade your Acer Aspire 5630-6760 Notebook (DDR2-533MHz) Laptop to up to a maximum of 4GB Memory, the system has 2 (2 banks of 1) to install Memory, already with 0MB standard Memory installed. For best Laptop performance use the maximum amount of allowed Memory per slot for your Laptop.

Jul 08, 2010 | Acer Aspire 5630 Notebook

1 Answer

RAM Upgrade


How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS. More information about OS memory maximums can be found at http://www.crucial.com/kb/answer.aspx?qid=4251

Not only is there a maximum amount of memory that your computer motherboard can accept, there is also a maximum amount of memory that your operating system (OS) can accept. For instance, when you install 4GB of memory in a 32-bit Windows system (the most common version; 64-bit systems are typically used by high-end users), your system reports only 3GB or 3.5GB.
First , we can assure you, there isn't a problem with the memory. While Windows allows for 4GB of memory to be addressed, it does not equate to 4GB of physical memory. Some of the memory (regardless of how much you have installed) is reserved for use by the devices that you are using, such as a graphics card, PCI card, integrated network connections, etc, meaning it is unavailable for use as normal main memory. Upon startup, your system calculates the amount of memory needed for these devices; if you haven't maxxed out the memory in your system, it's invisible to you, and all your physical memory (the installed RAM) is available for use. However if you've maxxed out the DRAM in your system, this amount will be deducted from your physical memory, so you can't use 100% of your DRAM. The maximum memory limitation varies by operating system, For instance, the 4GB memory limitation doesn't exist in 64-bit versions of Windows.

Click on this link or copy and paste the complete link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

Jun 06, 2009 | IBM PC 350 PC Desktop

2 Answers

Best Graphics Card, RAM for D101GGc


go for the nvidia geforce 8500, your board Support for up to 2 GB of system memory so no 4GB( too bad)

Jan 27, 2009 | Intel D101GGC Motherboard

1 Answer

Brand new gateway m-6846 vista 64bit


The maximum amount of memory that your system can use is actually limited in two ways — not only is there a maximum amount of memory that your computer motherboard can accept, there is also a maximum amount of memory that your operating system (OS) can accept.

For instance, when you install 4GB of memory in a 32-bit Windows system (the most common version; 64-bit systems are typically used only by high-end users), your system will see (and utilize) only 3GB or 3.5GB.
Relax, there isn't a problem with the memory. Windows allows for 4GB of memory to be addressed, but this isn't 100 percent the same as having 4GB of physical memory.

What happens is that some of the addressable memory (regardless of how much you have physically installed) is reserved for use by page files or by some of the devices that you are using, such as a graphics card, PCI card, integrated network connections, etc., so it's unavailable for use as normal main memory.

The amount of memory needed for these devices is calculated by your system at startup; if you haven't maxed out the memory in your system, it's invisible to you, and all your physical memory (the RAM that's installed) is available for use. However if you've maxed out the DRAM in your system, this amount will be deducted from your physical memory, so you can't use 100% of your DRAM.

The maximum memory limitation varies by operating system; for instance, the 4GB memory limitation doesn't exist in 64-bit versions of Windows.

Memory maximums for current Microsoft® Windows OSs include:

  • Windows XP Home: 4GB
  • Windows XP Professional: 4GB
  • Windows XP 32-bit: 4GB
  • Windows XP 64-bit: 128GB
  • Windows Vista Home Basic: 4GB
  • Windows Vista Home Basic 64-bit: 8GB
  • Windows Vista Home Premium: 4GB
  • Windows Vista Home Premium 64-bit: 16GB
  • Windows Vista Ultimate: 4GB
  • Windows Vista Ultimate 64-bit: 128GB+
  • Windows Vista 32-bit: 4GB
  • Windows Vista 64-bit: 128GB+

May 23, 2008 | Computers & Internet

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