Why doesn't my computer recognize/utilize the 4gb of RAM I have installed?

Question

I have 4gb of RAM installed in my desktop and when I did an InSPECS scan it shows that I have 4gb of RAM however the computer itself only recognizes 3.2gb of the 4gb. Any reason as to why and how to fix it?

System Info
Model : Asus M2N-E SLI
Chassis Type : Desktop
Operating System : Microsoft Windows XP Professional Service Pack 2 (Build 2600)
Processor
Number Of Processors : 1 Hyper-Threading Enabled
Type : AMD Athlon 64 X2 4000+ 4000+
Processors Bus Speed : 200 MHz
Motherboard
Manufacturer : ASUSTeK Computer INC.
Model : M2N-E SLI Rev. 1.XX
CPU Slot/Socket Type : Socket AM2 (940)
Chipset Vendor : NVIDIA nForce4 Rev. A3
Bios Manufacturer : Phoenix Technologies, LTD
Bios Version : ASUS M2N-E SLI ACPI BIOS Revision 1002
Graphics
Model : nVidia PCIE NVIDIA GeForce 8600 GTS
PCIE Speed : 16x
Monitor : Plug and Play Monitor
Storage
Hard Drive 1 : WDC WD3200AAKS-00VYA0
Size : 305.25 GB
Memory
Total RAM Installed : 4096 MB
Type : DDR2 Regular UDIMM PC5300
Used RAM Slots: 4 of 4

Answer 1

Summary:
If you are running 32-bit Windows, you must live with it. You will not ever see all 4GB of RAM you've paid for.

If you are running 64-bit Windows, you may have to live with it. Depending on your motherboard's chipset, your system may support memory remapping. If so, you will be able to use all 4GB of RAM.

Detailed:
Due to an architectural decision made long ago, if you have 4GB of physical RAM installed, Windows is only able to report a portion of the physical 4GB of RAM (ranges from ~2.75GB to 3.5GB depending on the devices installed, motherboard's chipset & BIOS).

This behavior is due to "memory mapped IO reservations". Those reservations overlay the physical address space and mask out those physical addresses so that they cannot be used for working memory. This is independent of the OS running on the machine.

Significant chunks of address space below 4GB (the highest address accessible via 32-bit) get reserved for use by system hardware:

• BIOS – including ACPI and legacy video support

• PCI bus including bridges etc.

• PCI Express support will reserve at least 256MB, up to 768MB depending on graphics card installed memory

What this means is a typical system may see between ~256MB and 1GB of address space below 4GB reserved for hardware use that the OS cannot access. Intel chipset specs are pretty good at explaining what address ranges gets reserved by default and in some cases call out that 1.5GB is always reserved and thus inaccessible to Windows.

When looking at memory in systems (be it desktop or notebook) there are three questions to ask that will tell you the maximum amount of memory your O/S will be able to use:

1. What O/S Edition have you installed?

a. 32-bit Windows is limited to a maximum of 4GB and cannot see any pages above 4GB.

b. 64-bit Windows can use between 8GB and 128GB depending on SKU.

2. What address range can your processor actually access?

a. Typically that’ll be 40-bit addressing today for x64 (Intel EM64T/AMD64), but older processors may be limited to 36-bit or even 32-bit

3. Can your system’s chipset map memory above 4GB?

a. Mobile chipsets on sale today cannot (but that may change with time)

b. Newer workstations (which use chipsets developed for single or multi-proc servers) usually can.

Windows can remap memory from below 4GB to above 4GB and use it there, however, that relies on the three points above:

1. Can Windows access memory above 4GB?

a. 32-bit – NO

b. 64-bit – Maybe (due to chipset limitations)

2. Can your processor access memory above 4GB?

a. If it’s recent then it might, and if it’s either AMD64 or EM64T it’s almost certain

3. Does your chipset allow pages to be remapped above 4GB?

a. Probably not – and that’s what’s catching people who install 64-bit Vista to work around point 1 – they find they still cannot see above 4GB

In some cases, OEMs may be able to tweak their BIOS to reserve less memory for platform use, but we’re not talking a huge difference (ie, 100’s of MBs).

In the end a 32-bit OS and/or application can only, ever, handle 4GB of memory at a time, the AWE stuff just swaps chunks of memory in and out of that 4GB space, thus fooling the application and OS into using more space than it can “see”.

Physical Address Extension (PAE), extends the physical address space to 36-bits if your HW supports this. For most operations, the processor execution units will only see 32-bit addresses, the MMU will take care of the translation to 36bit addresses. No swapping here, only page translations (which are used regardless of PAE being on or not), this is a fundamental feature of any virtual memory operating system.

The OS and apps only see 32-bit addresses because the registers are limited to 32-bits (hence the “32-bit” architecture nomenclature). These are linear addresses which are extended to 36-bits in the translation to physical addresses, but they never show up in registers since there’s no room. It’s all internal until the address lines coming out of the chip are toggled. Thus my comment above about “if your H/W supports this (PAE)". I’m not going into how that works…

So, the OS can happily handle up to 64 GB of memory for 32-bit PAE-able systems.

Hope this helps explain the whole, ‘Why can’t I see 4 Gig of RAM in my system?” thing…

BTW – This does not change for Vista either…

references:
http://support.microsoft.com/kb/929605/en-us

HWJunkie DL (MSFT internal)

Bob Heath (original author of this summary material)

Answer 2

You are running a 32-bit operating system. The maximum amount of memory supported to run the entire system is determined by this. You can calculate this by using 2^32=4GB. Unfortuneately, some devices reserve some of the total memory allocation to talk with the device's own memory. You probably have a 1GB video card that is reducing your overall usable memory installed. To fix this problem, you will need to upgrade to a 64-bit operating system.

Answer 3

You do not have a 64-bit operating system. Get XP 64-bit or Vista 64-bit and it will allow for the full 4 gigs of ram

Answer 4

They call it the "3GB threshold" and its common in XP. Unless you have a motherboard with a chipset that supports memory mapping, such as the 955X or 975X, you're not going to see all 4 GBs of Ram in Windows.

Answer 5

With 4Gb RAM on 32bit OS, about 750Mb sits practically useless in the upper memory hole. You can not do anything about it except move up to 64bit OS. 3Gb is the practical max for 32bit OS. Actually 2Gb is just fine.

Answer 6

Step 1 : Go To Control Panel
Step 2: Go To Add New Hardware
And Select What Hardware Your Putting On
And Click Add New Hardware And Sometimes You Can Get Really Specific On What Of Kind Of Hardware You Putting On

Answer 7

cuz ur using xp
u need 64 bit os

Answer 8

XP will only utilize about 3.3GB of RAM.

wdw