Geekbench - 8gb performed better than 16gb (RAM)

Discussion in 'iMac' started by SPNarwhal, Sep 27, 2011.

  1. SPNarwhal macrumors 65816

    SPNarwhal

    Joined:
    Apr 22, 2009
    Location:
    illinois
    #1
    so I was just upgrading my 27" i5 iMac to 16gb of RAM from 8gb, and thought it might be fun to do a benchmark for each to see the difference.

    After installing it, I did a benchmark and the results were actually worse with 16 than they were with the 8gb. I'm not really super knowledgeable about benchmarkings, but I'm thinking this shouldn't be the case? Any insight?

    8gb:
    http://browse.geekbench.ca/geekbench2/view/487831

    16gb:
    http://browse.geekbench.ca/geekbench2/view/487844

    What gives?
     
  2. thunng8 macrumors 6502a

    Joined:
    Feb 8, 2006
    #2
    Nothing gives. Geekbench tests CPU speed and memory speed. There should be no impact with increased memory capacity.

    The 2 scores are is within the margin of error. Even if that imac had 4Gb RAM, the scores would still be around the same.
     
  3. jrichman63 macrumors regular

    Joined:
    Sep 4, 2006
    Location:
    Pacifica, CA
    #3
    Try running geek bench a few times. It always varies a bit for me. Turn all programs off, restart the computer open activity monitor, kill dropbox & other apps running...etc... turn off activity monitor. Give the computer a minute to settle then run geek bench.

    I'm about to do the same up grade so I'll see also. Comparatively though relative systems chart shows yours pretty close, but others are all over the map.
     
  4. SPNarwhal thread starter macrumors 65816

    SPNarwhal

    Joined:
    Apr 22, 2009
    Location:
    illinois
    #4
    Right, it tests memory. Isn't the point of geekbench to show what your computer is capable of? How powerful it's specs are and such?

    You would think that it would be better with more memory then.

    Even in the Memory section, the 16gb rated lower than the 8gb, and while I realize the numbers will be slightly different every time, I don't think that 16gb should ever test lower than 8gb, or is common sense not the way to think about this situation?

    I can be wrong, but to me it still makes no sense.
     
  5. thunng8 macrumors 6502a

    Joined:
    Feb 8, 2006
    #5
    You are wrong. As per my first post, geekbench tests CPU and memory speed. Nothing else.
     
  6. SPNarwhal thread starter macrumors 65816

    SPNarwhal

    Joined:
    Apr 22, 2009
    Location:
    illinois
    #6
    isn't memory speed increased by upgrading your memory?
    or does it not matter how much ram you have in there, it will always give you the same speed?

    1066ghz is the speed, right?
    So if you have 1066ghz of 2gb and 1066ghz of 16gb, will they be the same?
     
  7. iBookG4user macrumors 604

    iBookG4user

    Joined:
    Jun 27, 2006
    Location:
    Seattle, WA
    #7
    No, memory speed is not increased by upgrading your memory. Unless you're getting page outs and using a lot of swap space you're not going to see a benefit from upgrading the RAM anyway.
     
  8. D4F Guest

    D4F

    Joined:
    Sep 18, 2007
    Location:
    Planet Earth
    #8
    It also depends what kind of memory did you upgraded with.
    All matching, same manufacturer, same specs?

    Different memories can give you different access times. More is not always better :)
     
  9. jsolares macrumors 6502a

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    Aug 8, 2011
    Location:
    Land of eternal Spring
    #9
    Memory speed isn't increased by upgrading to more memory, it can be increased if you upgrade to faster memory that your CPU/Motherboard support but still won't be that much.

    2GB of 1066mhz will be the same speed in memory throughput than 16GB of 1066mhz.

    The point of upgrading ram is not going faster per se, it's reducing pagefile usage, if everything stays in ram it's going to be faster in the end, but if your workload wasn't hitting the pagefile before you won't see a difference.
     
  10. jrichman63 macrumors regular

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    Sep 4, 2006
    Location:
    Pacifica, CA
    #10
  11. derbothaus macrumors 601

    derbothaus

    Joined:
    Jul 17, 2010
    #11
    More memory = more to test = takes slightly longer = weaker score.
    If you watch benchmark leaders they test their systems with perfectly paired smaller allotments because the whole point is speed and to get a better score. Usually 6GB max for triple channel and now Quad channel they'll test with 8GB most likely. I still would want to run a computer with 16GB though. Tests don't matter in the end for me.
     
  12. paulrbeers macrumors 68040

    Joined:
    Dec 17, 2009
    #12
    Think about memory like upgrading from a 2 door Coupe to a big SUV. You still can only go 70 on the interstate, but now you can take more people with you.
     

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