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  1. #1
    ROG Enthusiast Array
    Join Date
    Jul 2018

    Question VTTDDR voltage lower in OS than bios with Strix x470-f

    Mobo: Strix x470-f
    Cpu: R5-2600
    Ram: Adata d40, 3000, b-die
    Bios: Tested 4011 and 4008
    ram voltage: 1.4 to 1.49
    Soc: 1.1

    I am currently experiencing a weird issue with my VTTDDR voltage. It keeps dropping 0.1-0.13v lower than what I set it to in bios. Its not 100% consistent and varies on what I set my VTTDDR to in bios. If I have it at 0.7v(1.38-1.4v dram) it drops to 0.6 and if I set it to 0.75-0.76 (1.49v dram) it drops to 0.64. I previously suspected it simply reset to 0.6v but now I see it simply undervolts compared to what I set it to in bios. I can fix it OS with AI Suite but I suspect this causes a bottleneck in my memory OC as some clocks refuse to boot. Has anyone else experienced something similar? Any suggestions on how to fix/mitigate this? Is it a read error in AI Suite? I kinda doubt the last bit because I get errors if I leave it at 0.6v while passing HCI 400% when manually adjusting it with AI Suite.
    Last edited by Leeta; 07-19-2018 at 05:17 PM.

  2. #2
    ROG Enthusiast Array
    Join Date
    Jul 2018

    I figured out that bios literally puts VTTDDR voltage 0.1v below bios setting. Its static with some rounding errors at some values. Bypassed this issue by "overvolting" bios setting with 0.1v to get proper VTTDDR during bootup. Auto setting is useless because my bios treats VTTDDR as (DramVoltage/2)-0.1v.

  3. #3
    ROG Guru: Brown Belt Array gupsterg PC Specs
    gupsterg PC Specs
    MotherboardAsus Maximus VII Ranger
    Processori5 4690K
    Memory (part number)HyperX Savage 2400MHz 16GB
    Graphics Card #1Sapphire R9 Fury X (1145/545 Custom ROM)
    MonitorAsus MG279Q
    Storage #1Samsung 840 Evo 250GB
    Storage #2HGST 2TB
    CPU CoolerThermalRight Archon SB-E X2
    CaseSilverstone Temjin 06
    Power SupplyCooler Master V850
    Headset/Speakers HyperX Cloud
    OS Win 7 Pro x64 / Win 10 Pro x64
    gupsterg's Avatar
    Join Date
    Feb 2015

    I suspect the small swing in voltage (if there is any) is being shown as larger value by monitoring software. Usually the granularity is not fantastic on voltages reported back by Super IO chips.
    Intel Defector AMD Rebel

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    24/7 OC: i5 4690K @ 4.9GHz CPU@1.255v 4.4GHz Cache@1.10v - Archon SB-E X2 - Asus Maximus VII Ranger
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