First of all, which Operating System are you using 32 bit or 64 bit.
How much memory are recognised in the BIOS?
Which bios version do you have?
Have you checked whether the memory meets the mininum requirements?
Refer to TPS for more information
Memory Limits in Windows
Limits on memory and address space vary by platform and operating system. Typically, 32-bit versions of Windows XP and Windows Vista are limited to 4GB. To take advantage of system memory greater than 4GB, all the following components must support 64-bit:
- Operating System
- Processor (EM64T)
Refer to Enabling 64-bit Desktop Computing
In addition, the 32-bit versions of Windows will reserve a portion of memory for critical system functions such as chipset, BIOS flash, PCI Express, etc. If you have 4GB installed, Windows will indicate less than 4GB is available (example: 3.24GB). Your desktop board’s Technical Product Specification includes a detailed system memory address map.
Refer to these articles for additional information:
- Memory Limits for Windows Releases*http://msdn2.microsoft.com/en-us/library/aa366778.aspx
- Physical Address Extension - PAE Memory and Windows*http://msdn2.microsoft.com/en-us/library/aa366778.aspx
- Windows Vista or Windows Server 2003 may report less memory than you expect*
I know for sure (on intel desktop board DP35DP) that if you are using 8gb memory, desktop without onboard graphics and windows xp 64 bits, the memory will be 7.93 GB in Windows, which is pretty good.
Memory Allocation in Windows XP 64 bit:
Using external GFX
Memory: OCZ 667Mhz and Kingston HyperX 667Mhz
2Gb: 1.99 Gb
3Gb: 2.93 Gb
4Gb: 3.93 Gb
5Gb: 4.93 Gb
6Gb: 5.93 Gb
7Gb: 6.93 Gb
8Gb: 7.93 Gb
Now if you would like to have some more information on Windows 32 bit and 64 bit, may be you can check on this website:
Hope these information will be of some help to you. I am not an expert on this, hope someone else can help you on this.
First, thanks for your help! My BIOS reconize 4GB of memory. Firts I have windows XP and them I install windows 7 of 32Bit, and happend the same thing.
I read the information that you send me. i learn that I have to change my operating system for one that operates in 64bit... Thaks again for your help!!!