One stick of Ram not showing up

Hi all,

I have a computer running a BIOSTAR MCP6P M2+ 6.X motherboard using CORSAIR XMS2 4GB (2 x 2GB) Ram running windows 7 Home Premium 64 bit. When I first installed the Ram last year It showed up as 4 Gigs, however I recently noticed that it is only displaying 2.0 Gigs, in the My Computer Properties as well as CPU-Z, and in the POST. I have tested each stick individually in each slot and they work fine. However, when both are in only 2 gigs shows up. What might be the cause of this?

Also the Bios is up to date.
5 answers Last reply
More about stick showing
  1. Please post the exact Corsair part number and revision number of your MOBO.
  2. This is what I know, here are the links to the very parts in case I didn't provide the info you requested.

    Brand: BIOSTAR
    Model: MCP6P M2+ 6.X

    Brand: CORSAIR
    Series: XMS2
    Model: TWIN2X4096
    Type: 240-Pin DDR2 SDRAM
  3. The DDR {TWIN2X4096} does not appear to be compatible with your MOBO.

    Here's the BIOSTAR approved list {TWIN2X4096} is not on that list -

    Corsair does not list your MOBO. Also the compatible Corsair DDR per BIOSTAR are all no longer manufactured.

    Kingston KVR800D2N6K2/4G -

    Crucial -

    Hope this answers your question, and I wish I had better news. :(
  4. Well its the motherboard. I put the old G.Skill Ram it used to have back in there and it only reads one stick. Time for a new motherboard I guess.
  5. Its after your post a combination of both your old MOBO + incompatible RAM.
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