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Mixing old slow RAM and new fast RAM

I was given a PC that had 4GB of A-RAM DDR3 1333.
Not long after this, I purchased 8GB of G.Skill Ripjaws X DDR3 1600.
For the past couple of months I've been running the PC with both installed.
Is this a good idea? Could the cheap / nasty RAM be hampering the new RAM? Or is it better to have the 12GB?
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  1. Best answer
    It's better to have just one type of ram. You should just use the 2 x 4gb 1600. Quite often mixing ram causes BSoD's.
  2. No BSoDs so far, but I have been wondering whether the slower RAM would be holding the faster RAM back?
  3. What the DRAM running at? Can check with CPU-Z in the memory tab - it will show true freq (800 for 1600, 667 for 1333 since this is Double data rate DRAM)
  4. Tradesman1 said:
    What the DRAM running at? Can check with CPU-Z in the memory tab - it will show true freq (800 for 1600, 667 for 1333 since this is Double data rate DRAM)


    535...
    https://dl.dropboxusercontent.com/u/83859030/Clipboard02.jpg
  5. Pulled old RAM, new RAM now running at 602.
  6. Click on the SPD tab in CPU-Z and see what timings and voltage are spec'd to run 800 and manually set those in the BIOS.

    Check your M/B manual and put the 8g 2 x 4g modules in the dual channel slots ASUS recommends them to be installed in.
  7. Or just enable XMP in bios
  8. RAM currently in recommended slots.
    Turned off overclocking, and under AI Tweaker in the BIOS set tuning to DOCP, then selected 1600 profile. RAM now running at 800 ^_^
  9. Sounds good !
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