Windows 7 says that only half my RAM is usable

Hi everyone, been searching the forums lots for the answer to this but haven't been successful yet.

I have a Sony Vaio Laptop - it's about 2 years old. It had 3GB (1 x 1GB and 1 x 2GB) stick installed.

However, windows said: Installed RAM: 3GB (1.74GB Usable).

I thought I might have a broken RAM stick, so I purchased a new 2GB stick. However, it now says 4GB (1.74GB Usable).

There are two RAM slots and whichever RAM stick I put in the second RAM slot, that amount becomes Unusable, even though it's recognised in the BIOS and in windows as being installed.

If I take all RAM out of the first slot and just try to boot using RAM in the second slot, the computer will not start.

There is no memory remapping function that I can find in my bios.

Any advice would be appreciated. I am suspecting that the second RAM slot is faulty, however the fact that it is still showing in the BIOS and on windows, suggests it's operating to a certain extent.

Is there anyway the second RAM slot might have been disabled?
6 answers Last reply
More about windows half ram usable
  1. The video card and CPU shares the RAM. Usable is what the CPU uses, and non-usable is what the Video Card uses. The two RAM connectors have markings that tell which slot is for video and other slot for CPU.

    you may be able to change RAM allocation through the BIOS.
  2. I agree. I think that second ram slot is faulty.
  3. Windows 7 32 or 64 bit?
  4. Windows 7, 64-bit
  5. make sure ur rams are seated properly!

    and go to msconfig pick the boot tab go to advanced options and make sure the maximum memory check box is marked and see if it helps

    also try this :

    http://support.microsoft.com/kb/978610
  6. if u r still having the problem try reseating ur CPU
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