6GB of RAM, Windows 7 64-bit says only 3GB is usable

Hi folks,

Today I replaced my old GeForce 8500GT graphics card with a brand new HD5770. After installing the new card though I have a problem - windows now is only letting me use 3GB of my 6GB of RAM!

It's coming up in the Resource Monitor as 'Hardware Reserved' which I assume is for the HD5770, but why would it need 3GB of RAM on top of its 1GB already?

When I start the system it is only showing 3GB, though the 'Windows Experience Index' states that there is 6GB of RAM (3GB usable), and as said, the Resource Monitor lists 3GB of RAM as hardware reserved.

How do I change this and get back to using the full 6GB?

My system specs are:
- Windows 7 64-bit (yes, it's definately 64-bit)
- 6GB DDR2 800 RAM
- HD5770 Graphics
- Gigabyte M61-PM-S2

I did look at the Bios, but can't find anything about shared memory etc.
7 answers Last reply
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  1. Hello
    open msconfig>boot>advanced options and make sure "Maximum memory" is unchecked.
  2. Yeah already tried that one. It was already unchecked, and I left it that way, so that's not the problem :(
  3. 1_Turn on "Memory remap" in the BIOS(it maybe called "memory hole remapping")
    2_Make sure you have the latest BIOS version installed
    3_Try re-seating the RAMs
  4. 1. There doesn't seem to be a 'memory remap' option in the Bios. Where exactly would it be located?

    2. I definately though, though I'll check again

    3. My RAM is extremely touchy, I only just got them working again. As I said though, Windows is picking up that it is usable, though when my computer boots, the Bios is only showing 3GB.

    EDIT: I flashed the Bios, and it didn't do anything
  5. It should be located in the "Memory" tab,I'm not sure about it, check this link
    http://support.microsoft.com/kb/929605/
  6. If the ram is "touchy" try new ram, there may be a problem.
  7. Maziar said:
    1_Turn on "Memory remap" in the BIOS(it maybe called "memory hole remapping")
    2_Make sure you have the latest BIOS version installed
    3_Try re-seating the RAMs


    Like Maziar, this article may help you.

    http://www.tomshardware.com/forum/263765-30-hardware-reserved-memory

    http://www.overclock.net/intel-memory/697272-windows-7-hardware-reserved-memory-2-a.html
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