AMD Ryzen 5 9600X & Ryzen 7 9700X Linux Performance With 105 Watt cTDP

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  • zeb_
    replied
    For some reason, I cannot upload my tests, I get errors with pts upload command, will have to investigate.

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  • zeb_
    replied
    I have succeeded to create an Openbenchmarking account - I will upload those results later.

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  • zeb_
    replied
    Originally posted by coder View Post
    Which? You mean PBO?
    I mean it would be better to enable TDP 105W than PBO, as you suggested, At least on my configuration PBO does not produce significantly better result than TDP105W (1% difference) but leads to very high temperature. And TDP105W seems to produce the same boost than PBO in the processor tests I used. Also, contrary to PBO, TDP105W is warrantied by AMD. I do not know if further testing could nuance this statement however.
    Last edited by zeb_; 13 January 2025, 09:35 AM.

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  • coder
    replied
    Originally posted by zeb_ View Post
    Yes, you are right, sorry for the confusion. Instead of writing "you should/want" I should have used "one should/want".
    Which? You mean PBO?

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  • zeb_
    replied
    It seems that PB2 and PBO are two different things after all... PB2 is automatically enabled on Ryzen CPUs that support it, and is obviously under warranty. PBO on the other hand is still noted as voiding warranty. This is so confusing!

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  • zeb_
    replied
    Originally posted by coder View Post
    Which do you mean? I've already said I'd go with stock frequency limits and a higher power limit, but that's just me.
    Yes, you are right, sorry for the confusion. Instead of writing "you should/want" I should have used "one should/want".

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  • coder
    replied
    Originally posted by zeb_ View Post
    This may suggest that there are differences in real-life performance between TDP105W and PB2, but this has still to be shown in practice or in the tests. So if you want a boost, plainly warrantied, and that you are not concerned by the electricity cost, then it is probably the better choice. And again it is the 9700X that benefits the most.
    Which do you mean? I've already said I'd go with stock frequency limits and a higher power limit, but that's just me.

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  • zeb_
    replied
    To finish, AMD's blog on PB2 states: "When the processor has headroom in these categories, and the active workload requires additional performance, Precision Boost 2 will automatically raise frequencies until one or more of the above limits is reached. When/if the limit is reached, processor frequencies will automatically level off to a steady-state condition for ongoing performance enhancement. Throughout this process, the processor can monitor conditions and adjust frequencies up to 1000 times per second. As a result, achieving maximum boost frequency and the sustained boost conditions observed by you will depend on the application and workload. It is a good guideline to know that light workloads experience the highest boost frequencies, while heavier multi-core and/or sustained workloads are more likely to encounter a limit and receive less boost."

    This may suggest that there are differences in real-life performance between TDP105W and PB2, but this has still to be shown in practice or in the tests. So if you want a boost, plainly warrantied, and that you are not concerned by the electricity cost, then it is probably the better choice. And again it is the 9700X that benefits the most.

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  • zeb_
    replied
    Originally posted by coder View Post
    I wonder whether PBO is even respecting the power limit at all? You're probably right that, at least with your current setup, changing the limit to 105W probably won't have any effect on PBO performance.
    There are more info on PBO1 (which was introduced in 2018 for Threadripper CPUs) and PB2 for Ryzen, in AMD's own blogs:Note that under PBO AMD wrote "Precision Boost Overdrive requires a 2nd Gen AMD Ryzen™ Threadripper processor with AMD X399 chipset motherboard. Because Precision Boost Overdrive enables operation of the processor outside of specifications and in excess of factory settings, use of the feature invalidates the AMD product warranty and may also void warranties offered by the system manufacturer or retailer."

    However this warning is not repeated for PB2 for Ryzen CPUs. And by the way, they now call it PB2, and not PBO2, removing the "Overclocking" word in the acronym! They have been very fuzzy, describing PB2 as a safe enhancement "Precision Boost 2 is a performance-maximizing technology available in all AMD Ryzen™ and Ryzen™ Threadripper™ 2000 Series processors (or newer). This technology can improve your PC’s performance by raising clockspeeds, which makes the processor—and your applications—run faster. Best of all, Precision Boost 2 is entirely automatic: AMD’s intelligent processors have a sophisticated set of sensors designed to analyze conditions inside your PC and make the “go faster” decision as often as possible.". This suggests, without plainly stating it, that PB2 is still within safe limits defined by the CPU own sensors, but maintaining some ambiguity.

    EDIT: It seems that PB2 and PBO are two different things after all... PB2 is automatically enabled on Ryzen CPUs that support it, and is obviously under warranty. PBO on the other hand is still noted as voiding warranty. This is so confusing!

    In addition, AMD's blog announcement of TDP105W support specifically states: "With the new 1.2.0.2 BIOS update, you can run your AMD Ryzen 9600X and 9700X processors at 105W TDP without voiding your warranty for doing so." For this enhancement they leave absolutely no ambiguity.
    Last edited by zeb_; 13 January 2025, 06:25 AM.

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  • zeb_
    replied
    Originally posted by coder View Post
    Yeah, the image hosting on this forums software will down-sample your images and I haven't been very successful in controlling that.
    I wish I could create an account on Openbenchmarking.com, but once I fill the form and submit, I get a blank page, no error. But the account is not created. I will post on the subforum for help.

    Originally posted by coder View Post
    Anyway, if you just want to tell me the 105W stats similar to how you did for PBO, that would be fine with me.
    So far the processor tests I used show this, but I would need to run other tests, notably system, to see if there are tasks which show differences. between the 2 boost strategies.
    Last edited by zeb_; 13 January 2025, 03:58 AM.

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