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Safe Vdimm non HS DDR4 DIMMs

Discussion in 'Memory' started by Hotrod2go, Aug 29, 2020.

  1. Hotrod2go

    Hotrod2go Member

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    As per title,
    How high is too high for daily operation when heatsinks have been removed from SR Dimms?
    Keeping in mind 1 of the DIMMs just barely fits under 1 of CPU HS fans hence the removal of HS from DIMM. Atm, running 1.375v
    Btw, case has 5x140mm PWM fans + 2 more on CPU HS & I certainly don't run a crowded case as indicated in my sig.

    Big thanks in advance!
     
  2. integralfx

    integralfx Member

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    That mostly depends on the ICs
     
  3. OP
    OP
    Hotrod2go

    Hotrod2go Member

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    Hynix CJR
     
  4. integralfx

    integralfx Member

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    CJR is fine up to 1.45v
     
  5. OP
    OP
    Hotrod2go

    Hotrod2go Member

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    Thanks, good to know. Currently testing at 1.38v - 3533Mhz on Zen+, I'll post some pics when stable with timings.

    Problem is raising Vdimm can produce errors in stress tests like TM5 v0.12. Fiddling with CadBus settings & proODT can help to some extent in alleviating this.
    It's known that the fab process on high bandwidth DDR4 is so ultra fine that too much voltage can cause signal jitter.
     
    Last edited: Sep 2, 2020
  6. ozz

    ozz Member

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    removing heatsinks from the dimms will actually aid your dimms in being cooler, beleive it or not, the case air flow will be well sufficient to aid cooling
     
    Hotrod2go likes this.
  7. demiurge3141

    demiurge3141 Member

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    Ram heatsinks are for decoration purpose only.
     
  8. OP
    OP
    Hotrod2go

    Hotrod2go Member

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    Yes indeed, that was my original view of them when DDR4 first hit the market yrs ago...
     
  9. OP
    OP
    Hotrod2go

    Hotrod2go Member

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    with 1.39vdimm was able to get this on 2600x & X570 platform. 3533MHz is pushing IMC on Zen+ to limits. Unless one is lucky in the silicon lottery & maybe on premium ITX board could get 3600 + with Zen+
    2x8GB Patriot Vipersteel @ 3533 TM_1.JPG
     

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