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Thread: Is GA F2A85X UP4 causing voltage drop under load?




  1. #1
    PedangGila's Avatar
    PedangGila is offline Junior Member
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    Default Is GA F2A85X UP4 causing voltage drop under load?

    I recently bought this mobo and pairing it with A8 5600k. I've disabled TurboCore, Cool&Quiet and APM when OCing the APU between 4.3Ghz - 4.5Ghz with just max 1.47 vcore and 1.20v NB VID in bios (F2 and F4) but during CPU test like Frizt Chess and Prime95, CPU-Z and EasyTune 6 reported a voltage drop down to 1.416v. It's during idle both apps shows a higher voltage 1.452 vcore while the APU is doing 1.3Ghz. *facepalm* Core Temp 1.0 RC5 never showed temp above 60C during testing but the same time it's 68C with EasyTune and climbing.

    hardware Spec:

    PSU - 600w FSP aurum gold
    RAM - Kingston ValueRam KVR16N11/8 OC to 1833Mhz CL12
    Cooler - Cooler Master Hyper Evo twin fan (Enermax Magma) push pul

    Am I missing something in BIOS or it's inevitable this APU/Motherboard will lower the voltage regardless of any tweaking?


    "If Andes is just a grain then take my words with it"

  2. #2
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
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    Default Re: Load Line Calibration and vdroop = cpu voltage drop under load

    The lower voltages under load are called vdroop and this is normal and should not be confused with vdrop.
    Vdroop is your friend as it keeps cpu voltage swings within normal limits.
    Some claim that they need to enable some level of load line calibration (aka LLC) in the bios for stability with very high overclocks.
    I've seen several instances in the forum with older motherboards where their highly overclocked systems passed rigorous stress testing with LLC enabled, only to randomly fail at idle. The amount of vdroop varies with different motherboard models. Some newer motherboards have several LLC options from mild to wild.

    Check out AnandTech | Overclocking Intel's New 45nm QX9650: The Rules Have Changed, page 5
    and AnandTech | Overclocking Intel's New 45nm QX9650: The Rules Have Changed, page 6 from 2007 for a detailed explanation.
    For more information, search using:
    • vdroop vs vdrop
    • load line calibration
    • amd load line calibration
    You will find a wide range of opinions.
    If your system is stable without LLC enabled, don't worry, be happy.
    Last edited by profJim; 07-29-2013 at 09:20 AM.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
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  3. #3
    PedangGila's Avatar
    PedangGila is offline Junior Member
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    Default Re: Is GA F2A85X UP4 causing voltage drop under load?

    Now that's a mindblowing revelation, the LLC tab. Most reviews I read on this APU mentioned nothing about LLC tweaking. With vcore LLC set to Medium, CPU-z and EasyTune 6 reported a stable 1.452 vcore during Fritz Chess test. Now I know what's been holding the voltage. Eventhough that's quite astray from 1.463v set in BIOS, another mystery, at least I don't see a voltage drop.

    Thanks profJim.


    "If Andes is just a grain then take my words with it"

  4. #4
    profJim's Avatar
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    Default Re: Is GA F2A85X UP4 causing voltage drop under load?

    You're welcome.
    As I recall, with my former EP45-UD3P motherboard, vdroop under full load with no LLC was 0.06 volts lower than the idle voltage reading, but my system was completely stable using an E6550 overclocked from 2.33GHz to 3.44GHz.

    **edit**
    I forgot to add the you need to check the cpu voltage in your bios and then compare that with your cpu voltage when your system is idle at the windows desktop. This voltage difference is vdrop and there isn't anything you can do to change vdrop.
    Last edited by profJim; 07-29-2013 at 11:13 PM. Reason: added vdrop info
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  5. #5
    PedangGila's Avatar
    PedangGila is offline Junior Member
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    Default Re: Is GA F2A85X UP4 causing voltage drop under load?

    It's looking good. Ran a one hour testing, the core voltage tiptoed on 1.440v down from 1.452 idle using prime95 small ftt 8k X 4 workers. Far from being stable but at least with medium LLC set this apu manage to go beyond a few minutes of testing without error.


    2013-07-29_23h01_22 by n00bst4t, on Flickr


    "If Andes is just a grain then take my words with it"

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