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4gb (only 2.99gb usable) dell optiplex 745

I have mid tower dell optiplex and i have
2 (1gb ddr2)
1 (2gb ddr2)

the 2gb ram i took from an old work pc
i tried installing them in many ways to make the all 4gb readable but it was not possible
what should I do

another thing when i used only 2gb ram or the dual 2X1gb ram it read it normally as 2gb with no usable message

I added a photo here
the 2gb ram in the front while the other two 1gb in the back

is this right or i missed something
https://s30.postimg.org/58gbwg8a9/19024411_1565781223494457_164009549_o.jpg
9 answers Last reply Best Answer
More about 4gb 99gb usable dell optiplex 745
  1. 1) what does CPU-Z show for total memory?
    2) do you have a gfx card installed?
  2. 32-bit or 64-bit os?
  3. clutchc said:
    1) what does CPU-Z show for total memory?
    2) do you have a gfx card installed?


    Cpu-z shows memory like that and forgive me if I missed something, I never used this program before


    gfx card is built in intel
  4. Its using memory for the integrated gpu.
  5. bignastyid said:
    32-bit or 64-bit os?



    32 bit
  6. Agefox said:
    clutchc said:
    1) what does CPU-Z show for total memory?
    2) do you have a gfx card installed?


    Cpu-z shows memory like that and forgive me if I missed something, I never used this program before


    gfx card is built in intel




    That "missing" memory is used by the video buffer. Win sets aside some system RAM for a buffer depending on the size of the card's VRAM.
  7. Best answer
    Agefox said:
    bignastyid said:
    32-bit or 64-bit os?



    32 bit


    Between a 32-bit os and an igpu you aren't going to get it to see more ram. with a 64-bit os you might get it to see ~3.5Gb because of what the igpu uses.
  8. maestro0428 said:
    Its using memory for the integrated gpu.


    How can I be sure of that ?
  9. Thx a lot for Helping here
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