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

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  • zeb_
    Phoronix Member
    • Jun 2008
    • 72

    #41
    I realise the figures are very small and blurry, although I insert them full-size.

    Comment

    • coder
      Senior Member
      • Nov 2014
      • 8989

      #42
      Originally posted by zeb_ View Post
      I realise the figures are very small and blurry, although I insert them full-size.
      Yeah, the image hosting on this forums software will down-sample your images and I haven't been very successful in controlling that.

      I gave up and used a 3rd party image hosting service. There are some free ones people use, like imgur. I think Proton might also be an option ( https://proton.me/drive/photo-storage ). It's a hassle and I wish something Michael would do something to improve, at least for his subscribers.

      Anyway, if you just want to tell me the 105W stats similar to how you did for PBO, that would be fine with me.

      Comment

      • coder
        Senior Member
        • Nov 2014
        • 8989

        #43
        Originally posted by zeb_ View Post
        • ...
        • Tweaking memory timings has small impact. This is in addition to the "EXPO1" timings I used, for which my RAM is certified. They have several schemes and there is almost no impact betwen "Balanced" and the more aggressive "Tighter" and "Tightest" ones. This is in line with what I saw on other tests published around the web.
        I don't know much about EXPO, but that's another one of those things I'd be inclined to avoid, at least without ECC RAM (and I'm not sure if any ECC DIMMs would even support it). If you decide to enable it, I think you should read more about it, and specifically regarding how it's implemented for DDR5 on the AM5 platform.

        Originally posted by zeb_ View Post
        I could try to enable both PBO and TDP105W but since with PBO alone we reach the max temperature, I do not expect significant improvement due to the lack of headroom. A better cooler could maybe help.
        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.

        Comment

        • zeb_
          Phoronix Member
          • Jun 2008
          • 72

          #44
          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.

          Comment

          • zeb_
            Phoronix Member
            • Jun 2008
            • 72

            #45
            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.

            Comment

            • zeb_
              Phoronix Member
              • Jun 2008
              • 72

              #46
              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.

              Comment

              • coder
                Senior Member
                • Nov 2014
                • 8989

                #47
                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.

                Comment

                • zeb_
                  Phoronix Member
                  • Jun 2008
                  • 72

                  #48
                  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".

                  Comment

                  • zeb_
                    Phoronix Member
                    • Jun 2008
                    • 72

                    #49
                    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!

                    Comment

                    • coder
                      Senior Member
                      • Nov 2014
                      • 8989

                      #50
                      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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