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Max Safe Voltage for OC? TridentZ RGB 32GB (4 x 8GB) DDR4 4000 F4-4000C15D-32GTZR

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  • Max Safe Voltage for OC? TridentZ RGB 32GB (4 x 8GB) DDR4 4000 F4-4000C15D-32GTZR

    Hello,
    I recently installed the TridentZ RGB Series 32GB (4 x 8GB) 288-Pin DDR4 4000 (PC4 32000) F4-4000C15D-32GTZR in my Asus Rog Strix z490 F-Gaming Motherboard. LGA1200

    This ram runs at 4000Mhz CL15-16-16-36 at 1.5v standard.

    What is the maximum voltage thats safe for overclocking? I am able to run this without any problems using XMP, but in order to squeeze any more out I need to go over 1.5v.

    (In case you need to know
    i7-10700k locked at 5.2Ghz all-cores at 1.4v
    Ring is set to 5.0Ghz but not forced.
    Corsair RM1000i PSU

    Let me know if you need additional info about my build.

    Thanks!
    Last edited by Rygar1976; 10-26-2020, 06:08 PM.

  • #2
    As long as the Voltage is used, the system is stable, and temperatures are within range, higher DRAM Voltage is fine.

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    • #3
      That’s good to know, thank you! I am good with CPU and GPU over clocking, but I’m still very new to overclocking RAM.

      with these particular sticks, what voltage increase would typically be needed to go up to, say 4200Mhz and 4400 MHz if timings were left standard?

      I can do the math on MHz compared to cas latency to determine what the fastest combo of frequency and CL is, but if I tried with the timings left stock for 4000mhz 15-16-16-36, what would the voltages typically need to be increased to, to run at 4200 and 4400mhz?

      Also what is a comfortable max temperature to set for these when running at higher than standard voltages?

      Thank you very much!!
      Last edited by Rygar1976; 10-27-2020, 04:06 PM.

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      • #4
        By my experience 1.26-1.55V gets you 24/7 stability on B-Die. That is from 3600 CL16 to 4000-4200 CL15 and 4266-4400 CL16.
        Only setting so far that needed more was with one stick of F4-3200C14D-16GVR that needed 1.56V for 3733 13-13-13.

        I can do the math on MHz compared to cas latency to determine what the fastest combo of frequency and CL is, but if I tried with the timings left stock for 4000mhz 15-16-16-36, what would the voltages typically need to be increased to, to run at 4200 and 4400mhz?
        4000 15-16-16 actually requires about the same voltage as 4000 15-15-15, maybe +0.03V more. And 4000 14-15-15 requires exactly the same as 4000 15-15-15.
        My F4-4000C15D-16GVK 4000 15-16-16 1.50V does:
        4000 15-16-16-36 1.47V
        4000 15-15-15-32 1.50V
        4000 14-15-15-32 1.50V

        Increasing frequency at 15-16-16 from 4000 to 4200, tCL 15 will be your bottleneck. It might very well be that 4000 is your max. But with good ICs you might get 4200 at 1.55V. With not very good ICs your best bet would be:
        4266 16-16-16 1.52V
        4400 16-17-17 1.55V

        Why G.Skill is doing XMPs with higher tRCD and tRP is probably because B-Die doesn't scale as well with tRCD/tRP as with tCL. At least at 14, at 15 tCL is harder to run and at 16 tCL and tRCD/tRP are around the same.
        For example my best kit, F4-3600C14D-16GTZNB does:
        4200 14-15-15-32 1.55V, that is a whole 300 MHz/tCL, but only 280 MHz/tRCD or tRP.
        It also does 3900 14-14-14 1.48V which is again 279 MHz/tRCD.
        Though this doesn't show at G.Skill XMPs, only when you overclock. As best G.Skill MHz/tCL is 4400 16-19-19-39 at 275 and best MHz/tRCD is 4000 15-16-16-36 at 250. 250 is not really good, even my worst kit does 270.

        All of what I said is for 2 sticks. With 4 sticks you should be happy it works XMP, maybe try lowering latencies like I said to 14-15-15.
        Last edited by GrimReaper; 02-08-2021, 02:56 AM.

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