Only 7.92Gb usable ram at 1600Mhz

Discussion in 'Desktop Computers' started by Chriszz11, Sep 11, 2015.

  1. Chriszz11

    Chriszz11 New Member

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    5
    I am currently using my computer for Video game development. I just installed 20 gigabytes of 1600 ram and it was only running at 1333. I went into Bios to change it and got it to run at 1600, but it will only use 8Gb. It will use all 20Gb at 1333 but only 8Gb at 1600. Any suggestions would be great.

    My Build:
    970A-UD3p Mobo and FX-6350 CPU

    The ram sticks I am using is a bit mismatched. I have an 8Gb G.Skill Ripjaws stick, a 4Gb G.Skill Ripjaws stick, and two 4GB Samsung sticks. could this be why? Thanks in advance!
     
  2. salvage-this

    salvage-this Active Member

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    3,737
  3. Chriszz11

    Chriszz11 New Member

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    5
    I will do that as soon as i get home. I would like to figure this out, i paid for the 1600 ram, it would be a shame to not be able to use it.
     
  4. salvage-this

    salvage-this Active Member

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    3,737
    Agreed. I've used that board before. I don't see a reason why it wouldn't work at the rated speeds.

    Welcome to CF!
     
  5. tylerjrb

    tylerjrb Member

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    612
    mismatched RAM will probably be why. Do they have voltage and Latency on the sticks themselves? set the voltage and latency to the highest stick. so if one is 1.5v and 10-10-10-30 and another is 1.4v 8-8-8-24. Set the memory in the bios to 1.5v and 10-10-10-30 if it hasnt done already.

    RAM can be odd especially when the sticks are not identicle.
     
  6. beers

    beers Moderator Staff Member

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    What are the specific specs of each stick?
     
  7. Chriszz11

    Chriszz11 New Member

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    I know they are all the same voltage, but ill have to look in a bit at what the latency is of each stick. I'll let you all know in a while.
     
  8. Geoff

    Geoff VIP Member

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    37,673
    What speeds are each stick rated at?
     
  9. Chriszz11

    Chriszz11 New Member

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    Hey everybody, thanks for all the help. It turns out that one stick i had installed was not XMP compatible and wouldn't let me enable XMP with it installed, i removed the stick and its recognizing 16Gbs at 1600. My last question is, for game development and rendering, would i be ok using 1600 cas9 ram? Would i notice a difference in render times switching to 1866 cas8?
     
  10. beers

    beers Moderator Staff Member

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    8,429
    You'd probably see a really slight decrease, but it wouldn't be worth investing in a whole extra RAM kit.
     
  11. Chriszz11

    Chriszz11 New Member

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    5
    That's kinda what i thought too. I appreciate the help everyone! Thanks again.
     

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