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AMD Zen 2 aka Ryzen 3000 CPUs details
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  • Interesting article - TSMC 7nm still having big issues

    • Only one core on our Ryzen 5 3600X processor will hit AMD's rated boost frequency. AMD confirmed some cores in Ryzen 3000-series processors are faster than others, which is denoted in Ryzen Master. That means that not all cores on can hit the single-core turbo frequencies. Instead, there are a mix of fast and slow cores.
    • We recorded up to a ~75 - 100MHz difference between the fastest and slowest cores, with only one core reaching the single-core boost frequency. AMD hasn't shared the definition of the frequency that is acceptable for slower cores (it is rational to expect this to be the base frequency). While we recorded relatively small frequency deltas in our sample, it impacts performance and denotes a shift in AMD's binning strategy compared to the per-core turbo performance of Zen/Zen+.
    • Previous-gen Ryzen processors can reach boost frequencies on all cores. Intel also says its processors can reach the turbo frequency on all cores.
    • Workloads running on Ryzen 3000's slower cores experience lower frequencies than the chip's rated boost speed, and thus lower performance.
    • The combination of Windows 10's new Ryzen-aware scheduler and AMD's chipset drivers allow the operating system to schedule single-threaded tasks into the fastest cores (thread pinning). AMD has previously disclosed the Windows 10 scheduler and the CPCC2 feature, but not that the combined features assign threads to the fastest cores. This functionality requires the latest version of Windows 10. This is somewhat similar to Intel's Turbo Boost Max 3.0 on its HEDT processors, but Intel doesn't set this as a requirement to reach the normal Turbo Boost 2.0 clock speeds.
    • Older versions of Windows cannot schedule threads into the fastest cores as efficiently, thus resulting in lower clock frequencies and performance for Ryzen 3000-series processors in some workloads, which may be at the root of many user complaints.
    • Most test utilities do not measure performance fast enough to catch bursty frequency boost activity. They also do not measure certain types of power states that could indicate higher boost activity.
    • Slower cores could be a contributing factor to low overclock ceilings with Ryzen 3000 processors. Ryzen 3000 series processors hit all-core overclocks 200-300MHz below the single-core boost frequency. Slower cores simply may not be able to achieve/sustain higher frequencies, thus serving as the weakest link in the chain.

    https://www.tomshardware.com/reviews/amd-ryzen-3000-turbo-boost-frequency-analysis,6253.html

    It is also reason why AMD tightly instructed and controlled all major tests, none of them explained you this at launch time or made good tests outside latest Windows 10 build.

  • AMD Financial Director Kumar director told that present average profits for Rizen 2 CPUs is more than 50% of retail price. And it is record in AMD history (for whole lineup).

    12 core model profits are around 85% of the price (16 is even more!), while 6 core model is much less.

    AMD can sell you 16 core CPU for $199 and still live perfect, but their owners need money, now.

  • Interesting Newegg pricing on 16 core Epyc chips

    • 7302 16 / 32 3.0 / 3.3Ghz - $1,019.99
    • 7282 16 / 32 2.8 / 3.2 - $674.99

    And it is always best chiplets, most cool, that go into Epyc.

    Means that this time AMD want to rip maximally top rich gamers.

  • Binning stats

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  • Ryzen 5 3500 coming soon

    • Disabled HT, so 6 cores / 6 threads, purely marketing requirement to segment offers
    • 3.6 GHz base clock
    • 4.1 GHz max boost
    • chiplets with worst binning
    • 65W TDP (it is lie, of course)
    • cost to manufacture of such complete CPU to AMD is around $20-25 :-)
  • Ryzen 3000 memory system

  • Boost statistics for single core

  • Marketing started to strike back

    AMD is pleased with the strong momentum of 3rd Gen AMD Ryzen™ processors in the PC enthusiast and gaming communities. We closely monitor community feedback on our products and understand that some 3rd gen AMD Ryzen users are reporting boost clock speeds below the expected processor boost frequency. While processor boost frequency is dependent on many variables, including workload, system design, and cooling solution, we have closely reviewed the feedback from our customers and have identified an issue in our firmware that reduces boost frequency in some situations. We are in the process of preparing a BIOS update for our motherboard partners that addresses that issue and includes additional boost performance optimizations. We will provide an update on September 10 to the community regarding the availability of the BIOS.

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    The original limits for Ryzen 3000 SKUs were:

    • 3600 = 4100MHz (80-95°C) / 4200MHz (< 80°C)
    • 3600X = 4200MHz (80-95°C) / 4400MHz (< 80°C)
    • 3700X = 4200MHz (80-95°C) / 4400MHz (< 80°C)
    • 3800X = 4300MHz (80-95°C) / 4550MHz (< 80°C)
    • 3900X = 4400MHz (80-95°C) / 4650MHz (< 80°C)

    Since then, it appears that the HighTemperature limit has been reduced further to 75°C (from 80°C). New SMUs also have introduced "MiddleTemperature" limit, but that gets disabled when PBO is enabled.

    There's no doubt that the 'reviewer BIOS' is faster and sustains higher boost clocks for longer than the latest releases. Many chips aren't reaching their full boost potential even with the N11 'reviewer BIOS,' so AMD's fix might consist of returning to the original hard 80C boost temperature limit, which we're told hasn't been officially seen in the wild.

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  • 16 core model postponed

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    Actual 7nm yields are still bad, it seems, with lot of defects and very rare all 8 cores on chiplet can work.

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