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Thread: QOTW: What do you score in Pifast?

  1. #33
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    Re: QOTW: What do you score in Pifast?

    Series computing time : 13.64
    Division time : 1.47
    InvSqrt time : 0.90
    Final huge multiplication time : 0.61
    ---------------------------------------------------------------
    Total computation time : 16.70 seconds(~ 0.00 hours)
    ---------------------------------------------------------------

    Pretty chuffed with that! i5 4670K @ 4GHz, bought off ebay 3-and-a-half years ago for £116.

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    Re: QOTW: What do you score in Pifast?

    It seems my very own overclocked I7-7700k beats the 8700k that hexus used haha!!! 13.59!!



    HEXUS - Do I get a prize for beating you on an older CPU?

    [edit] after a few more runs the best I have seen it do is 13.50
    Last edited by EvilCycle; 09-06-2018 at 12:08 PM.

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    Senior Member watercooled's Avatar
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    Re: QOTW: What do you score in Pifast?

    No idea. Can get 25M digits in about 1.5 seconds on y-cruncher though. Don't really see the point of antiquated, unoptimised and totally irrelevant synthetic benchmarks myself.

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  5. #36
    root Member DanceswithUnix's Avatar
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    Re: QOTW: What do you score in Pifast?

    Quote Originally Posted by watercooled View Post
    No idea. Can get 25M digits in about 1.5 seconds on y-cruncher though. Don't really see the point of antiquated, unoptimised and totally irrelevant synthetic benchmarks myself.
    So 2.5 times the digits in a magnitude less time?
    Guessing you aren't on a refrigerated 28 core CPU there either

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    Senior Member watercooled's Avatar
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    Re: QOTW: What do you score in Pifast?

    Just a plain old 7700 at stock.

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    Re: QOTW: What do you score in Pifast?

    Yeah! Because Pifast MATTERS!

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    Re: QOTW: What do you score in Pifast?

    17.4s on a stock 4690k, which is .4s longer than the hexus review. I'm running faster RAM than the hexus review (2.13GHz) but with looser timings

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    Re: QOTW: What do you score in Pifast?

    it was first 15.05 but then i closed down the browser, quit all the stuff on my 6 years ago installed windows7 on my many years old 3770K and got 14.95
    So from today im calling my PC blazing fast!
    I overclocked the CPU and memory about 5 years ago i even don't remember my settings around 4.7 GHz it could be (i'm getting old i know )

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    22.04 seconds using an i7-980 o/c @ 4GHz.

    Realised I was running some BOINC stuff in the background, turned that off and managed 21.81 Woo hoo!

    18.01 on an i7-6850K @ 3.7GHz (Normal BIOS settings on a ROG Strix X99 Gaming m/b)

    16.7 on an i7-6850K @ 3.9GHz (Optimal BIOS settings on a ROG Strix X99 Gaming m/b)

    16.41 on an i7-6850K @ 4.1GHz (Optimal BIOS settings on a ROG Strix X99 Gaming m/b, Memory @2666MHz)

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    Re: QOTW: What do you score in Pifast?

    Quote Originally Posted by watercooled View Post
    No idea. Can get 25M digits in about 1.5 seconds on y-cruncher though. Don't really see the point of antiquated, unoptimised and totally irrelevant synthetic benchmarks myself.
    Right. 16.5s in PiFast to get 10m digits or 4 seconds in y-cruncher (single threaded) to get 16m.

    The reason all these old Haswell/Ivy CPUs compete in PiFast is because it's ancient and doesn't use any modern extensions.

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    Re: QOTW: What do you score in Pifast?

    Series computing time : 17.49
    Division time : 1.95
    InvSqrt time : 1.19
    Final huge multiplication time : 0.80
    ---------------------------------------------------------------
    Total computation time : 21.47 seconds(~ 0.01 hours)

    CPU = Intel pentium g3258 @ 3.2 Ghz

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    Senior Member watercooled's Avatar
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    Re: QOTW: What do you score in Pifast?

    Quote Originally Posted by edmundhonda View Post
    Right. 16.5s in PiFast to get 10m digits or 4 seconds in y-cruncher (single threaded) to get 16m.

    The reason all these old Haswell/Ivy CPUs compete in PiFast is because it's ancient and doesn't use any modern extensions.
    I've said it before, but it's not having legacy benchmarks (or comparing performance across CPU generations on such apps, as a matter of interest) I have an issue with, as an example Anandtech do them but clearly put them under the section of 'legacy tests'. I do have issue with misleading claims like implying that this single, questionable benchmark has significant relevance when it comes to 'raw speed' (whatever that means), putting it up front on modern CPU benchmarks and drawing dubious conclusions from its results.

    If you want to know how fast these "apps and games still dragging their feet in terms of multi-core utilisation" perform - benchmark those instead! People might be interested in how Quake runs, but performance of PiFast doesn't tell us that. I doubt many are particularly concerned, when it comes to purchasing hardware, with how fast one pi-calculating application works when there are applications such as y-cruncher which will output the same result with orders of magnitude better performance on identical hardware. And neither can you use this benchmark to infer y-cruncher performance as their performance is very dissimilar, and it even includes a CPU dispatcher and different, tuned binaries for different microarchitectures and different ISA availability.

    As we've seen multiple times in the past, extrapolating from benchmarks to predict either future performance or performance of other applications has major caveats and sometimes completely wrong. Plenty of review sites were criticised for running very low-res game benchmarks, deliberately causing the game performance to be CPU-limited, as a way of showing 'how good the CPU is at game code', which of course turned out to be wrong as game code obviously continued to evolve to take advantage of hardware.

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    Re: QOTW: What do you score in Pifast?

    i5 6500

    Series computing time: 15.67
    Division time: 1.68
    InvSqrt time: 1.03
    Final huge multiplication time: 0.69

    Total computation time: 19.13 seconds(~0.01 hours)

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    Re: QOTW: What do you score in Pifast?

    I thought I'd do this as I've done some maths on the worth of a GTX 1080Ti or 1080 and in terms of improvement over my current card they're very nearly the same (in terms of percent improvement over current card per pound) but I wanted to ensure my current CPU set up (which is liquid cooled and I can't be arsed changing) wouldn't be a bottleneck. I have an i5-4690 at stock speeds (liquid cooling is there for future overclocking as it's not currently an issue but in future it may be and the enhanced cooling will improve lifespan....... okay so it looked cool, I had the money and so I did it, okay???) which scored 17.71 seconds. I thought this was a glitch but it's reproducible and others with similar CPUs seem to be getting the same. I'm going to post a thread in the forums for opinions on an upgrade, I'd be glad to hear opinions.

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    Re: QOTW: What do you score in Pifast?

    All right, there have been enough interesting threads and I could have enough fun with this one that I decided to register. And rather than run it on my main Sandy Bridge system, I thought why not run it on something that hasn't been done yet, like my Core 2 Extreme?

    Running it on my Dell Inspiron 1520 laptop from 2007, with a Core 2 Extreme X7900 (65nm, Merom), and DDR2 667 MHz on Windows XP. Taking the best of two runs at a speed.

    2.8 GHz @ 1.1625V (my usual top speed): 35.23 seconds
    3 GHz @ 1.25V: 33.3 seconds
    3.2 GHz @ 1.25V: 31.5 seconds

    Couldn't get it to run more than a second or so at 3.4 GHz, even at the max voltage of 1.275V. But I'm pretty pleased to get less than double what some of the Devil's Canyon and Skylake samples are scoring on a 10-year-old mobile chip.

    The fun part was that since this was single-threaded, I could push it farther than multithreaded workloads. For multi-core benchmarks, 3 GHz is just not possible, and at 3.2 GHz with a multithreaded workload it'd fold like a paper crane. But keep it single-threaded, and it can push out those few hundred extra megahertz.

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    Re: QOTW: What do you score in Pifast?

    27 seconds... Ryzen 2500u. Not bad for a 2ghz mobile chip, looks like AMD's second generation Ryzen is finally giving Intel the kicking it has needed for a while!

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