Infinity fabric clock uplift would make DDR4-4000 possible for Zen 3

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Oct 16, 2020.

  1. Venix

    Venix Maha Guru

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    Before you run to buy new ram wait for tests , 3200 to 3600 in my opinion does not worth the update on the ryzen 2 chips purely on cost/gains ratio! With zen 3 unifying cache the deminishing returns might hit faster ... I am pretty sure HH will reveal all these secrets!
     
  2. Goiur

    Goiur Master Guru

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    Has not been a week since i bought a 3600 cl16 kit, jokes on me!!

    If this is true ill give a try to OC the **** out of the kit, but first lets wait for reviews first.
     
  3. theoneofgod

    theoneofgod Ancient Guru

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    E-die?
     
  4. Goiur

    Goiur Master Guru

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    No clue lol

    edit: 99% its hynix
     
    Last edited: Oct 16, 2020

  5. bluedevil

    bluedevil Master Guru

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    https://notkyon.moe/ram-latency.htm
    This whole high hz ram is mostly bullshit because the timings also get high. 4000 cl 18 is no better than 2000 cl 9. It's the timings /hz that matter.
    On a sidenote ddr4 3200 cl 14 is actually a bit faster then ddr4 4000 cl 18 .
    There is also a thread somewhere on guru3d that tests the impact of different timings and subtimings on performance.
    Edit: https://forums.guru3d.com/threads/ram-timing-benchmark-cl-trcd-trp-tras-cr-trc-trfc-tref.346758/
    I'm not sure about the real advantage of running ram 1 to 1 with the fabric on ryzen. We would need a 2 kits that don't differ when calculating frequency sv latency one running at 1 to 1 with the fabric and the other asynchronous . Most tests don't account for the frequency vs latency calculation.
     
  6. abula

    abula Master Guru

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    Man i really wished AMD would have said something like they did on their Zen2 presentation posting about the inifinity fabric and the memory sweetspots chart with 3733 / 3600 / 3200... they should have said something with Zen3.... i though it they didn't mention, the ram and infinity would have remain the same... but now im going to have to wait for 3rd party reviewers to test memory and find the sweet spot.

    I'm grateful for this article/warning, i already had some Corsair 3600CL14 on order, now its cancelled until i see reviews.
     
    Last edited: Oct 16, 2020
  7. Goiur

    Goiur Master Guru

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    The I/O chip its the same. The changes they made to the CCX/CCD probably will change some things but i doubt it will be much. They said (if i recall correctly) that RAM wise, what worked for the 3000 would work for the 5000.
     
  8. GREGIX

    GREGIX Master Guru

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    I just bought tridentZ 2*16gb 3200 14-14-14-34 that I know does 4100c15. ~~230€>amazon.it. U can give m a try. I'll surely do. My patriots 2*8 did 4100 c15, g.skill my go not the same, depends ifmy CPU/mb will hold it.
     
    Undying likes this.
  9. Mufflore

    Mufflore Ancient Guru

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    I also have Ddie, but Corsair Vengeance LPX: 3000c15 that clocks the same as your Ddie, 3733c17.
    Been running for 5 years ish without a problem so far.
     
  10. Kaleid

    Kaleid Ancient Guru

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    Nope, not changing RAM once again. 32GB 3600 CL16 will have to do.

    "4000mhz cl19 costs 290Eur here atm which isnt that bad."
    That's almost twice as much as I paid for my current RAM. For 400Mhz more and increased CL? Nah, nope, ain't happening.

    DDR5 is next
     
    -Tj- likes this.

  11. doorspaulo

    doorspaulo New Member

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    This is gold man!
    Thanks.
     
  12. Neo Cyrus

    Neo Cyrus Ancient Guru

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    OCing my RAM/Fabric/Controller from 1800MHz to 1900MHz gave me a real-world uplift of 5%+ fps in games (usually much higher more around 10%), even single/dual threaded ones. That's with significantly worse timings on the RAM to OC it from 1800/3600 to 1900/3800MHz. Maybe it was just the games I was playing (only tested 3), and on my specific system, but I'd be pretty surprised if the uplift for most people going from 1600MHz Fabric/RAM/Controller to 2000MHz wasn't a decent amount.

    But then again all that would be on Zen 2, I don't know enough about the changes in Zen 3 to know if it would matter as much.
     
    Lily GFX likes this.
  13. tunejunky

    tunejunky Maha Guru

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    right now in California ddr4 4000 is still only sold in 8gb sticks so any itx build would be 16gb ram max. the pricing is very good (here) and 32gb of ddr4 4000 cost less than the 16gb of ddr3 2800 (x4gb sticks) on my X99 back in the day.
    right now for whatever reason both Thermaltake and Patriot have both high supply, but the Patriot ALSO has a range of non RGB @ 4000 that saves around $20-30 per kit
     
    Lily GFX likes this.
  14. Askmyteapot

    Askmyteapot New Member

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    For those that have older DDR4 Kits... I am currently using a set of G.Skill TridentZ RGB 16GBx2 with an XMP of 3200 CL16-18-18-38-56. They are Hynix AFR dies.
    Currently with my 3900X on a x570 Gigabyte Aorus Elite.
    3800-16-19-19-38-57 and a tRFC of 480
    Nets me a Latency of 65.4ns. Just takes time to dial in the right stable settings. DDR4-timings.png thaiphoon-memory.png
     
    Lily GFX likes this.
  15. waltc3

    waltc3 Maha Guru

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    I'm already running 4x8GB 3733Mhz 16-19-19-19-39-68 1T Gear Down, with apparently perfect stability according to P95, Patriot Viper Steel DIMMs. x570 Aorus Master, bios F30. 3900X. With 1usmus's CTR b3 program I'm running the ram at that speed and settings, CCX's 1&2 4350MHz and CCX's 3&4 4175MHz CPU @1.30V max. I can run the ram @ 3800MHz but it's a tad unstable, so 3733Mhz it is! Very happy with that so far.
     
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  16. Lily GFX

    Lily GFX Member

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    Bought memory before we changed from Intel to AMD Zen2 so both kits are actually for "Intel".
    One is a G.Skill 32GB kit 4133 CL17 and other is a G.Skill 16GB kit 4400 CL18, both run
    currently @3733 16-16-16-16-32 1T. So still have some headroom on both.

    Both kits was cheaper than 3200 and 3600 kits when we bought them and still was cheaper
    for a long time after because most people bought 3200 or 3600 instead.
    Money saved ,better performance and still usefull on Zen3 if higher speeds are possible. ^^
     
    Maddness, tunejunky and Undying like this.
  17. kapu

    kapu Ancient Guru

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    My B-Die is waiting( tf2d416g4000hc18edc01) , it can push up to 4400Mhz , i think 4000 with low CL will be sweet spot.
     
  18. Jawnys

    Jawnys Member Guru

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    i have 2 kits from hyperx ddr 4000mhz at cl 19, im running them at 3733 cl 16 now, cant wait for my new 5900x :) tweak madness fun times ahead
     
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  19. Ub3rslay3r

    Ub3rslay3r New Member

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  20. tunejunky

    tunejunky Maha Guru

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    i personally like the Patriot Viper Steel Series, but you found just about the only 16gb sticks @ 4000Mhz.
    all things considered, go for the lower timings and the lower price. both Crucial and G.Skill are excellent. crucial makes its own memory modules but g. skill is extremely consistent.
     

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