Question about ASUS P4P800 SE (890552603657) Motherboard

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Cannot see 4 gb ram

Hi guys, I have 4 times 1gb ram but the bios only see 3Gb and the system boots very slow. Is there anything I have to set in the bios?
Francesco

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  • ohiotom May 11, 2010

    I don't believe there is any setting in the BIOS.



    Have you tried pulling out all but one module and booting? If it's still slow trying booting with just one other module. If it seems to boot faster then try adding a 2nd module and so on...

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Hi Ciccio8670,

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.

Posted on Feb 13, 2008

  • dokto205
    dokto205 Jan 20, 2012

    I disagree... If bios don't recognize 4 gb of ram in the starting of computer time its not be changed when you install 64 windows... but if bios recognize whole ram and windows not the problem is in the os...

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