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4gb memory installed but less memory size detected

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You probably have a 32 bit operating system. If so, then you will only see anywhere from 2.75 to 3.5gb of ram.

You need a 64bit operating system to fully see all 4gb of ram.

As long as you can see all 4gb of ram in bios, then you're ok.

Posted on Aug 12, 2008

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Is 2GB DDR2 PC2-6400 800MHz compatible with ASUS P5GC-MX/1333 if not what is the fastest and correct Ram I can fit;


From ASUS Site:
https://www.asus.com/us/Motherboards/P5GCMX1333/specifications/


2 x DIMM, max. 4GB, DDR2 667/533 MHz, non-ECC, un-buffered memory
Dual channel memory architecture
**When installing total memory of 4GB capacity or more, WindowsR 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.

Apr 01, 2017 | ASUS Computers & Internet

1 Answer

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

Added 1G memory, for a total of 2GB. the system still only sees 1G


If you installed total 4GB memory, the system will detect less than 4GB of total memory because of address space allocation for other critical functions, such as:

- System BIOS (including motherboard, add-on cards, etc..)
- Motherboards resources
- Memory mapped I/O
- configuration for AGP/PCI-Ex/PCI
- Other memory allocations for PCI devices

Different onboard devices and different add-on cards (devices) will result of different total memory size.
e.g. more PCI cards installed will require more memory resources, resulting of less memory free for other uses.

On a SLI system, since PCI-Ex graphic cards will occupy around 256MB, another 256MB will be occupied after you install a 2nd PCI-Ex graphic card. Hence, 2.75GB memory left only if two SLI cards installed on A8N-SLI Premium while 3.0GB memory left with one graphic card without other add-on devices.

This limitation applies to most chipsets & Microsoft Windows 32-bit version operating systems.

If you install Windows 32-bit version operating system, we recommend that you install less than 3GB of total memory. If more than 3GB memory is required for your system, then below two conditions must be met: 1. The memory controller which supports memory swap functionality is used. Chipsets later than Intel 975X, 955X, Nvidia NF4 SLI Intel Edition, Nvidia NF4 SLI X16, and AMD K8 CPU architecture support memory swap function. 2. Windows 64-bit OS which can address more than 4GB memory. You can check below URLs for reference:
http://dlsvr.asus.com/pub/ASUS/mb/4GB_Rev1.pdf
hope this helps

Apr 18, 2011 | ASUS P5RD2-VM Motherboard

1 Answer

How to make geforce6100pm-m2 read both memory slots


make sure your memory meets these guide lines.
? 2 x 240-pin DDR2 DIMM socket support up to 16 GB*
? * (Due to the DRAM maximum size is 2GB at present, the memory maximum size we have tested is 4GB)
? Dual-channel DDR2 memory architecture
? Support DDR2 800/667/533/400 DDR2 SDRAM
Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows?32-bit OS.
For Windows?64-bit OS with 64-bit CPU, there is no such limitation
which means win xp will only read 2gig and win vist/7 will read 4g so if you have 2x 2gig and only 1 is registering its working fine with win xp.
? 2 x 240-pin DDR2 DIMM socket support up to 16 GB*
? * (Due to the DRAM maximum size is 2GB at present, the memory maximum size we have tested is 4GB)
? Dual-channel DDR2 memory architecture
? Support DDR2 800/667/533/400 DDR2 SDRAM
Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows?32-bit OS.
For Windows?64-bit OS with 64-bit CPU, there is no such limitation
? 2 x 240-pin DDR2 DIMM socket support up to 16 GB*
? * (Due to the DRAM maximum size is 2GB at present, the memory maximum size we have tested is 4GB)
? Dual-channel DDR2 memory architecture
? Support DDR2 800/667/533/400 DDR2 SDRAM
Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows?32-bit OS.
For Windows?64-bit OS with 64-bit CPU, there is no such limitation

Jan 31, 2011 | EliteGroup GeForce6100PM-M2 Motherboard

1 Answer

ASRock 775v88 dont work with 4GB memory


I think your motherboard cannot support your 4GB of memory,
follow this link for your review : http://www.asrock.com/mb/overview.asp?Model=775V88&s=775
look at memory specifications : - Max. capacity of system memory: 4GB*
*Due to the chipset limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows® XP and Windows® XP 64-bit.

sorry!

Jun 09, 2009 | Asrock 775V88 Motherboard

1 Answer

Asus a8n sli premium


From the Asus support site.

If you installed total 4GB memory, the system will detect less than 4GB of total memory because of address space allocation for other critical functions, such as:

- System BIOS (including motherboard, add-on cards, etc..)
- Motherboards resources
- Memory mapped I/O
- configuration for AGP/PCI-Ex/PCI
- Other memory allocations for PCI devices

Different onboard devices and different add-on cards (devices) will result of different total memory size.
e.g. more PCI cards installed will require more memory resources, resulting of less memory free for other uses.

On a SLI system, since PCI-Ex graphic cards will occupy around 256MB, another 256MB will be occupied after you install a 2nd PCI-Ex graphic card. Hence, 2.75GB memory left only if two SLI cards installed on A8N-SLI Premium while 3.0GB memory left with one graphic card without other add-on devices.

This limitation applies to most chipsets & Microsoft Windows 32-bit version operating systems.

If you install Windows 32-bit version operating system, we recommend that you install less than 3GB of total memory. If more than 3GB memory is required for your system, then below two conditions must be met: 1. The memory controller which supports memory swap functionality is used. Chipsets later than Intel 975X, 955X, Nvidia NF4 SLI Intel Edition, Nvidia NF4 SLI X16, and AMD K8 CPU architecture support memory swap function. 2. Windows 64-bit OS which can address more than 4GB memory.

Jan 06, 2009 | ASUS A8N-SLI Deluxe Motherboard

1 Answer

Memory


Hi maiger,
Each of the 4 memory sockets on P4S800D-X can support 1GB memory module, so the M/B can support up to 4GB memory max. Please note that if you install four 1GB memory modules on P4S800D-X, the system may only detect 3GB+ (slightly less than 4GB) due to ICH5 resource allocation.

Mike

May 01, 2008 | ASUS P4S800D-X Motherboard

2 Answers

GA-8I945P-G 4GB Ram Problem


you maybe have integrated VGA card or Shared memory VGA card that use the memory in your pc .. your best solution is to buy new VGA Card that have dedicated memory

Dec 28, 2007 | Gigabyte GA-8I945P-G Motherboard

2 Answers

4 x 1GB DDR400 installed; only 3GB recognized by MOBO


If you installed total 4GB memory, the system will detect less than 4GB of total memory because of address space allocation for other critical functions, such as: - System BIOS (including motherboard, add-on cards, etc..) - Motherboards resources - Memory mapped I/O - configuration for AGP/PCI-Ex/PCI - Other memory allocations for PCI devices Different onboard devices and different add-on cards (devices) will result of different total memory size. e.g. more PCI cards installed will require more memory resources, resulting of less memory free for other uses. On a SLI system, since PCI-Ex graphic cards will occupy around 256MB, another 256MB will be occupied after you install a 2nd PCI-Ex graphic card. Hence, 2.75GB memory left only if two SLI cards installed on A8N-SLI Premium while 3.0GB memory left with one graphic card without other add-on devices. This limitation applies to most chipsets & Windows XP 32-bit version operating system. If you install Windows XP 32-bit version operating system, we recommend that you install less than 3GB of total memory. If more than 3GB memory is required for your system, then below two conditions must be met: 1. The memory controller which supports memory swap functionality is used. The latest chipsets like Intel 975X, 955X, Nvidia NF4 SLI Intel Edition, Nvidia NF4 SLI X16, and AMD K8 CPU architecture can support the memory swap function. 2. Windows XP Pro X64 Ed. (64-bit) or other OS which can address more than 4GB memory. You can check below URLs for reference: http://dlsvr01.asus.com/pub/ASUS/mb/4GB_Rev1.pdf http://www.intel.com/support/motherboards/server/sb/cs-016594.htm

Sep 06, 2007 | ASUS P4S800D-X Motherboard

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