Geekbench Memory Performance 2015 vs 2011 ?

Discussion in 'MacBook Pro' started by MacVibe, May 21, 2015.

  1. MacVibe macrumors regular

    Joined:
    Dec 21, 2009
    #1
    Running Geekbench 3.3.2 in 32-bit mode for the following:

    1) 2011 cMBP i7-2620M @ 2.70 GHz with 16384 MB 1600 MHz DDR3 I get memory performance scores: single-core 2943 and multi-core 3265.

    2) 2015 rMPB i5-5287U @ 2.90 GHz with 16384 MB 1867 MHz DDR3 I get memory performance scores: single-core 2549 and multi-core 2448.

    So, the 4 year newer machine, with faster memory and faster CPU, is about 20% slower. Could someone please explain this?

    Both machines are on Yosemite 10.10.3, the older machine has a SATA SSD, and the Geekbench for the new machine is about 20% faster for integer and floating point performance calculations.
     
  2. yjchua95 macrumors 604

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    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #2
    Use 64-bit ones. 32-bit ones are largely inaccurate. You can't expect it to measure a 64-bit CPU's full performance when running in 32-bit mode.

    Here's the 64-bit results - http://browser.primatelabs.com/geekbench3/compare/2173902?baseline=2166094

    The i5-5287U is a fair bit faster.
     
  3. MacVibe thread starter macrumors regular

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    Dec 21, 2009
    #3
    I haven't purchased the app, I am running 32-bit since it is available in tryout mode. Okay, thank you for the post on 64-bit, the memory performance is pretty even but on multicore the older machine is still slightly faster.
     
  4. yjchua95 macrumors 604

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    #4
    Are you blind?

    Multicore on the newer machine is 7467 points, compared to 5809 points on the older machine. So how is the older machine faster?

    It's a full 28.5% faster.

    The left column is the newer machine, while the right column is the older machine.
     
  5. MacVibe thread starter macrumors regular

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    Dec 21, 2009
    #5
    You use the word "blind" as if it were an insult. And no, I am not blind. This thread was specifically about the "memory performance" and if you scroll down to the "memory performance" section of the chart you linked to, you will see that the 2015 is quite even with the 2011, in fact, the 2011 is even slightly ahead for some tests. This seems odd to me. Maybe the memory benchmark is just not stressful enough to really show the differences, or maybe there hasn't been any architectural memory improvements in four years. I'm interested if anyone can explain this. Thanks !
     
  6. Kal-037 macrumors 6502a

    Kal-037

    Joined:
    Apr 7, 2015
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    #6
    The 2011 is an i7, the 2015 has an i5, that's the only reason the 2011 would have slightly better results in a couple tests, but from what I saw the 2015 was significantly better than the 2011 in 98% of the tests. The i7 has more on-board memory (cache) which helps deal with repetitive tests and tasks faster, (which would help explain some higher scores than the 2015 i5.) :)



    Kal.
     
  7. MacVibe thread starter macrumors regular

    Joined:
    Dec 21, 2009
    #7
    Thank you for that response, and yes, it looks like the i7 has a larger L3 cache (4096K vs 3072K).
     

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