Review: DDR5 Ryzen 7 7700 DDR5 memory scaling with G.Skill TridentZ5 6000 CL30

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Sep 26, 2022.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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    Review: DDR5 Ryzen 7 7700 DDR5 memory scaling with G.Skill TridentZ5 6000 CL30

    You've likely just read our Ryzen 7000 reviews. and will have noticed that AMD calls DDR5 6000MHz /30CL a sweet spot. It, however might not be a sweet spot for your wallet, ergo we take a look at how performance scales with different DDR5 memory configurations.

    Read the article here.
     
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  2. Valken

    Valken Ancient Guru

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    Best article here actually. Shows the world that RAM scaling is real. Just get the prices of the MB and DDR5 RAM down to previous gen levels then watch it take off.

    Will be waiting on X3D CPU to see the performance gains before buying.
     
  3. schmidtbag

    schmidtbag Ancient Guru

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    It's interesting to me how AMD isn't quite as memory bound as they used to be, which is nice. From what I recall with previous generations, memory speed made a noteworthy difference in just about everything you run, but now that doesn't seem to be the case.
     
  4. Agent-A01

    Agent-A01 Ancient Guru

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    That's because there is a lot more cache this generation
     

  5. -Tj-

    -Tj- Ancient Guru

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    To be honest I expected higher bandwidth in Aida64, similar to intel ddr5. Ok in 7950x review it does a little better by read and copy.

    7700x
    [​IMG]

    7950x
    [​IMG]


    Now look at my ddr4 4400 go :D
    cachemem 5.05ghz.png
     
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  6. haste

    haste Ancient Guru

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    I'd like to see 6400 CL32. If there is any difference...
     
  7. cucaulay malkin

    cucaulay malkin Ancient Guru

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    that's some pretty awful latency for 6000 c30 ddr5.
     
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  8. Reddoguk

    Reddoguk Ancient Guru

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    Look at that 5800X3D go.

    It's smashing the 7700X in gaming still even with 6000mhz DDR5 @ CL30 and 5nm CPU.
     
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  9. user1

    user1 Ancient Guru

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    interesting to see that reads don't scale on the 7700x but they do on the 7950x, basically the opposite situation to the zen 2 and zen3 processors where writes were impacted.

    edit: contradicts amd's own slides, so it might be an aida bug
     
    Last edited: Sep 26, 2022
  10. Valken

    Valken Ancient Guru

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    SOON! I'm waiting for the 7x00X3D as well! If not, I will try to find a AM4 system with 5800X3D, or 12600K. I don't want the heat output from OC'ed 12700K or faster Intel CPUs. It is already 34 C where I am.

    No Russian Winters for me.
     

  11. Noisiv

    Noisiv Ancient Guru

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    Dunno why but this reminds of "Just when I thought I was out..."

    ...
    I want them to move to 40W and they go to 200W
     
  12. Valken

    Valken Ancient Guru

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    I'm wondering what could have happened if Ryzen 4 was on AM4 with DDR4 now...
     
  13. Fediuld

    Fediuld Master Guru

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    Hilbert, there is something wrong with DDR5 Read/Write/Copy values with the 7700.

    Look at Read value of the 6000Mhz. Is barely 166MB/s faster than the 5200mhz RAM while the Write is over 13000MB/s

    6000Mhz DDR5 Read should be around 94000, Write 84000, Copy 84000.
    5200Mhz DDR5 Read should be around 87000, Write 79000, Copy 81000.
    Only the latency seems OK for those DDR5 kits.

    To put in perspective 3600Mhz DDR4 has Read is around 56000, Write 52000, Copy 54000.

    Something is very wrong with the results.

    [​IMG]
     
  14. Fediuld

    Fediuld Master Guru

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    It will be cruising at the top.
    First because temps will be much lower, and so will power consumption, because of the smaller IHS,

    Second due to better RAM latency.

    AMD said also that they will support AM4 until 2024. So cross fingers to see Zen4 or even better Zen4 with 3D cache on the platform. :)
    I am not switching from AM4 for the foreseable future. The 5900X serves me well, if I want something to boost speed, I will go for either 5800X3D for gaming or 5950X for all other work I am doing.

    However, lets hold to the thought.

    Because as you see on the post above, the numbers do not add up for the DDR5 ram speeds. They are similar to 3600-3800 DDR4 and they are not right which might affect the performance of the Zen4 overall atm.
     
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  15. user1

    user1 Ancient Guru

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    might be an aida bug, but it may also be an artifact of the chiplet design, remember how zen2/3 had half the write performance on single die setups?, afaik its the same with zen4, though it appears to be reversed.

    With zen 4 stock the infinity fabric is clocked at 2000mhz and its double pumped, so max data rate is capped at 128gb/s, however it means its basically stuck in asynchronous mode, the fclk never matches the uclk/ mclk , so there is a performance penalty associated, I haven't seen anyone try to set the fclk to 2400mhz with a 4800mt/s kit yet, might not be possible, but I would expect that the performance would be better , since it would be running in synchronous mode hypothetically.

    edit: also theoretically setting the fclk to 1200mhz might yield a synchronous operation, without sacrificing bandwdith, but I suspect that the loss in frequency would hurt latency more than the asynchronous mode does.
     
    Last edited: Sep 27, 2022

  16. Fediuld

    Fediuld Master Guru

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    Doesn't seem like AIDA bug because Igor Labs has 81428MB/s Read for the 6000C30 going to 87911MB/s on a 6400C32.
    6000C30 write is 85200MB/s and Copy 74500MB/s.

    The numbers are still low compared to Intel, but not as slow as DDR4 3800Mhz speeds.
     

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