System cannot detect some RAM


I have installed some new RAM into my computer, replacing an 512MB stick with a 2GB one.
After some issues, I have succesfully booted the computer, however the system shows 3,5GB of installed memory (and 2,5GB of this can be used), while it's 4 GB.
The memory sticks' pins are not damaged as far as I know, also, the system (before the new RAM) used to take 10 MB or similar from the RAM, not 512MB...


Motherboard: Gigabyte GA-945GM 52
RAM Slots: 4 DDRII
1: Kingmax DDRII 1GB
2: Kingmax DDRII 1GB
4: Kingmax DDRII 2GB (the new one)
Videocard: nVidia GeForce 8600 GTX
CPU: Intel Quad double-core 3.00 Ghz

If anyone can give me a hint why is this happened, I would be very happy :)
4 answers Last reply
More about system detect ram
  1. You might be using a 32 bit version of windows which typically only detects 3 to 3.5GB of RAM.
  2. Good point, but I'm using 64-bit Windows 7 D:
  3. It looks like your motherboard only supports a maximum of 4GB of RAM which means it's limited to a size of 1GB per slot. That might be the reason why you are having issues although I'm not totally sure. It sounds almost exactly like you're using a 32 bit version of Windows.

    The memory section states that your motherboard only supports up to 4GB of RAM. unfortunately the manual located here doesn't mention anything about how much RAM you can install per stick.
  4. Thanks for the info. Wierd, after changing the frequency to 2.00, the operating system suddenly found 3.25GB of RAM, including the video card's downgrade.
    I have no idea what is going on, but as far as my computer works, I don't really care!
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