M2 benchmarks

By: Adrian (a.delete@this.acm.org), June 16, 2022 12:44 pm
Room: Moderated Discussions
none (none.delete@this.none.com) on June 16, 2022 10:14 am wrote:
> > Nevertheless, there is no doubt that 1800 is wrong, because that is the score that
> > I get on a Zen 3 @ 4.8 GHz (no overclocking, no PBO, slower memory than standard;
> > Zen 3 with standard memory gets around 1810 @ 4.8 GHz and around 1850 @ 4.9 GHz).
> >
> > i7-1280P is Alder Lake @ 4.8 GHz, which must obtain a ST GB5 score higher than Zen 3 by 15% to
> > 20%, so it should obtain a score around 2100. ST GB5 scales very well with the clock frequency,
> > so an i9-12900HK @ 5.0 GHz must obtain a score not much less than 2200. For desktop Alder Lake
> > there are indeed many results in the database around 2200, which must be the right ones.
>
> > I couldn't find any result 2000 for 12900HK.
> I found this one at 1926: https://browser.geekbench.com/v5/cpu/14211317
> And it shows frequencies at 49xx MHz in the .gb5 file.
>


Looking at the i9-12900HK results, I have seen immediately a higher result, at 1944, but indeed I have not seen results over 2000.

Comparing with a desktop Alder Lake, I have not seen any obvious problem, as the results were proportional, but with a ratio much larger than the expected 5.2 GHz / 4.9 GHz.

The frequencies recorded by GB5 are not completely trustworthy, because AFAIK they are not computed as average frequencies over the test durations (which can be done using a performance counter for the accumulated CPU clock cycles over the complete test) but they are measured between tests, so they could be modified during the tests due to interfering programs, or due to throttling.


I have not tested any Alder Lake, but I have tested Zen 3 in GB5, so for Zen 3 I know with certainty which are the real GB5 results.

1926 @ 4.9 GHz would mean an IPC higher than Zen 3 only by 4%, instead of the expected 15% to 17%.

At least for the desktop Alder Lake, all the published benchmark results that I have seen are consistent with the Intel claims about a higher IPC being real.



There are no reasons for the laptop Alder Lake to have a lower IPC than the desktop Alder Lake, so the lack of high results for i9-12900HK might be caused by thermal throttling, which happens very frequently in laptops, caused by the quest for thinness and lightness.

If that is the case, the too low results do not characterize the CPU, but only the cooling systems of the laptops that happened to be used for running the benchmark.

For the laptops with decent thickness and weight, like the Dell Precision 7000 series that I use, any benchmark results are the same as for equivalent desktop CPUs, due to the good cooling. For most thin and light laptops, that is no longer true.

Also due to the good cooling, the GB5 results for Intel NUCs are frequently higher than for most laptops using the same CPUs.
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TopicPosted ByDate
M2 benchmarks-2022/06/15 12:27 PM
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      M2 benchmarks-DDR4 vs DDR5Doug S2022/06/16 09:58 AM
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