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  • #16
    Originally posted by liam View Post
    I said exactly which benchmark I was looking at. Did you even Google it?
    All I claimed is what the benchmarks relayed. No more.
    On single threaded perf, the a7@1.3ghz is about 30% faster than the i5@2.5ghz. That number is a composite that looks at FP, integer and memory tests.
    So, before you accuse someone of guessing perhaps your should at least inform yourself of what they are speaking about.
    Look at the site and get back to me with particular complaints.
    Lastly,I don't give five shits about apple, I'm only using then because they've the only v8a core that's readily available, do, again, next be cautious with your assumptions.
    I have no idea why you are so angry. Or for that matter where you got your numbers from.

    Let's LOOK at the numbers:
    iPad Air at 1.4GHz. Geekbench single core rating is 1371:
    http://browser.primatelabs.com/ios-benchmarks

    To quote from Geekbench: "Geekbench 3 scores are calibrated against a baseline score of 2500 (which is the score of an Intel Core i5-2520M @ 2.50 GHz)"
    Scaling that 2500 to 1.4GHz would give a rating of 1400. Like I said --- equal IPC.

    Don't agree with that? OK, let's try a different Intel chip.
    http://browser.primatelabs.com/geekbench3/647668
    This gives us a single core score (for a Haswell i5 iMac, 32-bit mode, 3.2 GHz) of 3304. Naively scaling that to 1.4GHz we get 1445. Same sort of ballpark. 64-bit mode would increase the value by a few percent, but same basic point --- a Cyclone core is about the same IPC as a an i3, and ever so slightly behind an i5 and i7 (which have larger L3 caches, probably a slightly better memory controller, and a bunch of features that help with larger benchmarks but not so much with Geekbench).

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    • #17
      Originally posted by name99 View Post
      I have no idea why you are so angry. Or for that matter where you got your numbers from.

      Let's LOOK at the numbers:
      iPad Air at 1.4GHz. Geekbench single core rating is 1371:
      http://browser.primatelabs.com/ios-benchmarks

      To quote from Geekbench: "Geekbench 3 scores are calibrated against a baseline score of 2500 (which is the score of an Intel Core i5-2520M @ 2.50 GHz)"
      Scaling that 2500 to 1.4GHz would give a rating of 1400. Like I said --- equal IPC.

      Don't agree with that? OK, let's try a different Intel chip.
      http://browser.primatelabs.com/geekbench3/647668
      This gives us a single core score (for a Haswell i5 iMac, 32-bit mode, 3.2 GHz) of 3304. Naively scaling that to 1.4GHz we get 1445. Same sort of ballpark. 64-bit mode would increase the value by a few percent, but same basic point --- a Cyclone core is about the same IPC as a an i3, and ever so slightly behind an i5 and i7 (which have larger L3 caches, probably a slightly better memory controller, and a bunch of features that help with larger benchmarks but not so much with Geekbench).
      You're absolutely right. I misread the baseline as being at 1000, thus my 30%, which certainly explains why you were asking which benchmark.
      I was angry for two reasons: 1. it didn't seem as if you'd looked at the benchmark site (since you were asking which benchmark), 2. got seemed to be focusing on apple when the fact that the a7 is an apple chip was entirely incidental to me. I mentioned the freq scaling only to bring up the point that even if the a7 was clock-for-clock as fast as the i5, due to it's arch it may not be feasible to scale it that high on current nodes (and without lots of cooling).
      I apologize for being short with you.

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