Zen 3 - Number of load/store units

By: itsmydamnation (no.delete@this.way.com), October 8, 2020 2:38 pm
Room: Moderated Discussions
⚛ (0xe2.0x9a.0x9b.delete@this.gmail.com) on October 8, 2020 11:22 am wrote:
> Rayla (rayla.delete@this.example.com) on October 8, 2020 10:28 am wrote:
> > ⚛ (0xe2.0x9a.0x9b.delete@this.gmail.com) on October 8, 2020 10:21 am wrote:
> > > The video states (in just the two actually useful sentences about Zen 3 core architecture, 9m29s) that
> > > Zen 3 has wider integer and floating-point units compared to Zen 2 and increases the number of loads&stores
> > > compared to Zen 2. But does "an increased number of loads&stores" mean that there are 3-4 load units and
> > > 2 store units in Zen 3? There unfortunately isn't any Zen 3 core architecture diagram in the video.
> > >
> > > -atom
> >
> > Maybe it's referring to greater number of in-flight load/store ops?
>
> It is possible.
>
> In general, if there is 10-20% increase in average IPC (in any kind new CPU when compared to a previous generation
> CPU) then it is likely there exists at least one architectural feature within the new CPU that has alone/by-itself
> 50-100% higher performance in synthetic benchmarks designed to stress that particular CPU feature. The question
> is: What Zen 3 features with 50-100% improvement are there? The only such Zen 3 feature disclosed so far is
> that L3 cache directly accessible by a CPU core has increased from 16 MiB to 32 MiB.
>
> -atom

While its all ARM level marchitecture for performance increase ( :) /s dont kill me ) AMD actually sold themselves short in some regards.

What i mean by that is they game tested @ 1080p not 720p which increases how often they are GPU bound in a frame. LOL and CS:GO are by far the lightest GPU loads and also low CPU thread count and they show ~50% performance increase. That extra ~30 points of performance over base average IPC increase is going to be largely from low thread counts having access to 32mb of L3. If they game tested @ 720p and picked some more notorious low thread count games ( CIV5, cities skylines, etc) they could probably skew there gaming performance even higher from 26% perf improvement.

Worth noting this is the Same 7nm process as Zen2 and thus no EUV until Zen4.
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TopicPosted ByDate
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  Zen 3 - Number of load/store units2020/10/08 10:21 AM
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        Zen 3 - Number of load/store unitsAdrian2020/10/08 11:53 AM
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        Zen 3 - Number of load/store unitsitsmydamnation2020/10/08 02:38 PM
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                  Zen 3 - Number of load/store unitsDummond D. Slow2020/10/09 09:43 AM
                    Zen 3 - Number of load/store unitsDoug S2020/10/09 01:43 PM
                      N7 and N7P are not load/Store units - please fix the topic in your replies (NT)Heikki Kultala2020/10/10 07:37 AM
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    Zen 3anon2020/10/08 01:57 PM
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        Thoughts on "Improving the Utilization of µop Caches..."anon2020/10/15 11:56 AM
          Thoughts on "Improving the Utilization of µop Caches..."anon2020/10/15 11:57 AM
            Sorry about the messanon2020/10/15 11:58 AM
              Sorry about the messBrett2020/10/16 03:22 AM
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            Caching dependence info in µop cacheanon2020/10/16 12:36 PM
              Caching dependence info in µop cachePaul A. Clayton2020/10/18 01:28 PM
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            Some comments on benchmarksMark Roulo2020/10/14 03:21 PM
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        Zen 3Michael S2020/10/11 02:18 AM
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      I think he's comparing 65W 3700X vs 105W 5800X (NT)John H2020/10/12 04:33 PM
        ?! Those are apples and oranges! (NT)anon2020/10/12 04:49 PM
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