DDR5-6000 Memory is the Sweet Spot For AMD Ryzen 7000 Zen 4 CPUs

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Aug 10, 2022.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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  2. Joao Pott

    Joao Pott New Member

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    Amazing news for Ryzen users (like me). But I expect the price of good quality kits with 32Gb DDR5-6000 (16Gx2) to drop considerably. Another concern is compatibility in the first few months after release, I had a lot of problems being an early adopter of a Ryzen 1700 at the time of its release... I hope the same torture doesn't happen this time... It's actually one of the reasons that I will wait at least 1 month of reviews before investing in a new PC with the right memory this time, from the beginning (my current one is a 5900X/32Gb 4000Mhz+RTX3080).
     
  3. Undying

    Undying Ancient Guru

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    Good as 32gb 6000 cl36 costs around 300eur. Not that bad considering it was double the price not long ago.
     
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  4. Horus-Anhur

    Horus-Anhur Ancient Guru

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    This is a huge bump from the 2000mhz in Zen3. Really nice stuff.

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  5. Undying

    Undying Ancient Guru

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    zen3 could not even reach 2000mhz IF.
     
  6. Horus-Anhur

    Horus-Anhur Ancient Guru

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    It could in some very lucky CPUs.
     
  7. Zeblote

    Zeblote Member

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    6000 CL36 is not good though. That has worse latency than previous DDR4 kits.
     
  8. schmidtbag

    schmidtbag Ancient Guru

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    While this is very good and completely satisfactory for my needs, I would hope that future APUs can get the 1:1 on faster memory, because they're gonna need it.

    We really need to stop measuring by CL and start measuring in total latency. Every version of DDR gets significantly worse CAS latency but the total latency tends to improve. DDR5 at 6000MHz and CL36 is better than most options for DDR4, especially if you compare performance : price.
     
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  9. Kool64

    Kool64 Maha Guru

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    A C30 kit is about $100 USD more than a C36 kit. So the question is would a lower latency slower kit be better or should you stick with the C36 if trying to save money?
     
  10. user1

    user1 Ancient Guru

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    the zen 3 apus can do <2200mhz

    i was able to boot into windows at 2466mhz in 1:1mode with non-suicide voltage on a 5600g (the ram being the limiting factor). i think most of them can do 2400mhz stable with sufficient voltage.
     
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  11. schmidtbag

    schmidtbag Ancient Guru

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    If you're not depending on an iGPU and are doing dual-channel, I figure spending the extra $100 won't be worth it in real-world workloads. I suspect Zen4 isn't going to be held back as much by memory performance as Zen2, especially if you get a 1:1 gear.
     
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  12. GREGIX

    GREGIX Master Guru

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    In most cases CL and other primary timings are not so significant to DDR5 overall latency and general performance as secondary and tertiary timings.
    Yes, it nice to have 6000+MHz cl32 kit, but it will get destroyed left on xmp by tuned cl40 kit at same frequency.
     
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  13. cucaulay malkin

    cucaulay malkin Ancient Guru

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    finally ddr5 will be worth it.
     
  14. Zeblote

    Zeblote Member

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    Sure. My current DDR4 kit is 3600 CL14. The best DDR5 I can buy is either 6000 CL30 or 5600 CL28. The "total latency" is almost 30% worse.

    This will be a horrible "upgrade", especially in Unreal Engine games that spend lots of time chasing pointers.

    Maybe I need to wait another year for good DDR5 to appear...
     
  15. Kool64

    Kool64 Maha Guru

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    Yeah I actually had that same conclusion when I bought my C18 3600 32gb kit for $100 or so less than the comparable C16.

    indeed but then you could theoretically tune the better kit even more for even more speed. Then again these days I personally don't OC stuff like I did back in the day so I'm more of a middle of the road drop in performance type.
     

  16. schmidtbag

    schmidtbag Ancient Guru

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    Do you know what total latency means? Because where are you getting 30% worse from?
    https://www.eurogamer.net/digitalfoundry-ddr5-vs-ddr4-ram-memory-z690-12900k?page=2
    While that chart shows CAS latencies higher than what we're talking about, it still tells a complete story: we're talking a couple nanosecond here and there, which is basically margin of error.
    Meanwhile, note the major improvement in read/write performance of DDR5. Even if the total latency was worse (which it pretty much isn't), you would still have overall better memory performance.
     
  17. cucaulay malkin

    cucaulay malkin Ancient Guru

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    but the bandwidth is a lot higher
    what is preferred depends on the game really
    for example asetto runs great on 5800x3d and likes low latency
    https://www.purepc.pl/test-pamieci-...0k-najszybsza-kombinacja-na-swiecie?page=0,24
    cyberpunk prefers more cores and higher bandwidth
    https://www.purepc.pl/test-pamieci-...0k-najszybsza-kombinacja-na-swiecie?page=0,27

    mind you 12900k runs even 5200 in 1:2 mode while 3800 ddr4 runs 1:1
    6000 or even 5400 in 1:1 will be a game changer let's hope it's true
     
  18. Joao Pott

    Joao Pott New Member

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    I think you may have a point... I'll wait for trusted reviews comparing the latencies of available DDR5 kits to see in the real world what the impact is, especially in games, which is when I need hardware the most these days... for my productivity (streaming production) - Vmix, video editing - Premiere, AF, etc - and Office apps) it doesn't affect me to have high latency memory kit (like cl36) ...
     
  19. JamesSneed

    JamesSneed Ancient Guru

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    You will get both with the 7800x3d.
     
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  20. southamptonfc

    southamptonfc Ancient Guru

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    "Total latency", has increased in every generation of DDR. It hasn't in any way made PCs slower. The greatly increased bandwidth makes up for the worse latency.

    Memory speed is less important than GPU or CPU performance. Benchmarks show that if you're running 4K, very fast RAM makes no difference.
     
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