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safedisk

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    ROG Crosshair VIII Hero / FORMULA / IMPACT / DARK HERO / EXTREME LN2 OC Guide

    in Ryzen | Bristol Ridge AM4

    Posted · Edited by safedisk

    ROG CROSSHAIR VIII Series 4001 BETA BIOS

    1. Update AGESA version to ComboV2PI 1206

    New AGESA version has been applied, but there may be bugs.
    So please rollback to the previous version if you have any problems
    Thanks

    ROG CROSSHAIR VIII HERO BETA BIOS 4001

    ROG CROSSHAIR VIII HERO WIFI BETA BIOS 4001

    ROG CROSSHAIR VIII FORMULA BETA BIOS 4001

    ROG CROSSHAIR VIII IMPACT BETA BIOS 4001

    ROG CROSSHAIR VIII DARK HERO BETA BIOS 4001

    ROG CROSSHAIR VIII EXTREME BETA BIOS 0601

     

     

    FOR XOC 3001 BIOS (Some CPUs have better XOC in old bios, so need to test it)

    HERO : https://drive.google.com/file/d/19phgI9Uqw1dyly0svQEGAsz05Y6uhpxX/view?usp=sharing

    HERO WIFI : https://drive.google.com/file/d/1IB78aBuTMM3oyhThv1q3DGNa56xhF1Ga/view?usp=sharing

    FORMULA : https://drive.google.com/file/d/1fJLp-XpeShG72o-QNywLjH4vNo6vM9wH/view?usp=sharing

    IMPACT : https://drive.google.com/file/d/1DBP_QdaNfCtjFDdImicZYRUxn6gwB5l3/view?usp=sharing

    DARK HERO : https://drive.google.com/file/d/1j3N0deJg94ZTbEYVMq9biIpZMW2rHRNx/view?usp=sharing

     

    NEW OC PACK

    TURBOV : https://drive.google.com/file/d/1Kkf430LfxOE22lykbp62N7yzF7XPOmcC/view?usp=sharing

    OCTOOL : https://drive.google.com/file/d/1rUROnjW53ZD80IhaONVk3bl7hsUdv0zV/view?usp=sharing

     

    tRFC / tRFC2 / tRFC4 now max value can do 1023.
    LN2 jumper enabled, FCLK = 1566, VDDG CCD = 1.2V, VDDG IOD = 0.9V.
    LN2 jumper enabled DRAM voltage = 1.65V.

     


    USB Flashback

    1559113709797.thumb.jpg.30a6cec7ea4021d1ed5e181b19044e2c.jpg

     

     

    LN2 OC TIP

    There is an FCLK cold bug under LN2 so try to stay around 1400~1600 for FCLK under LN2 to get a good compromise between temps and perf.

    To improve stability in this case:

    VDDG 1.15v, SOC 1.28v, disable DF Cstates.

    Depending on the CPU and FCLK, may have to control temps -120C ~ -170C.

    I typically use 1.35v ~ 1.55v SOC just to get as high an FCLK/Cold bug margin as possible.

     

    Do not be alarmed when it resets when temperature changes, pcie and fclk needs to retrain when temps change. Also sometimes there is temperature hole so going lower than it hangs may help.

     

    FCLK
    Biggest problem on the platform
    1200 default freq and supposed to go 1:1 with memory for best latency.
    Improves performance but limited, ~ 1800+ on air and 1400 on LN2.
    FCLK instability includes hang at postcodes such as ‘07’, stuttering in OS, drop performance in Cinebench.
    CPU has FCLK cold bug.
    Improve FCLK Margin by using 1.15VDDG (too much will hang) and 1.3+v SOC. Since VDDG is sourced from SOC so SOC should be higher. VDDG only takes effect at 1400+ FCLK so under LN2 you need to set 1400. Higher usually fails during LN2.

    Enable LN2 mode, Use the Load LN2 profile as a base template, this uses low vcore so you can save exit when it’s not cold. You will need to do this before -40C to avoid cold bug. You need 1400 FCLK + 1.15v VDDG and 1.35~1.45VSOC.

     

    Post codes

    07 : too high fabric / fabric unstable (can press reset 2~3 try but If not solved You need to reset the flck clock after lowering the temperature to -120c.)

    F9 or 23 : High Memory Clock / Tight Timings (Memory reset need)

    other code : (can press reset 2~3 try but If not solved You need to lower the temperature to 100c ~ 120c.)

     

    About AMD Limitations

    Safemode cannot restore back to stock memory settings as this takes place in the ‘PSP’ which the BIOS has no control over at that point of time. Either you have to clear cmos or wait for 5 times of post code ‘F9’ to get into AMD’s recovery mode. AMD’s recovery mode restores every AMD option back to stock, including timings and CLDO voltages.

    Because of the above, try not to clear cmos during LN2, at most go safe mode if your settings can be sustained with 1.5v DRAM, since BIOS will apply 1.5v for safemode when LN2 enable. IF you clear cmos, FCLK will go back to Auto and CLDO VDDG voltage will too. When cold, FCLK needs to be 1400+ and VDDG 1.15v if not Fabric will be unstable so you need to torch up to maybe -60c in this case. Therefore test your Memory settings on ambient first. Cold CPU improves Memory OC so you don’t need to worry about MC cold bug.

    TRY NOT TO CLEAR CMOS WHEN CPU IS COLD

     

    1559216734738.thumb.jpg.f4ab9e7d413af3ed9b65c148a62419e7.jpg

     

    1559216408982.thumb.jpg.72b122676fc6f2d0d123dd376e8cbc7a.jpg

     

    1559216992665.thumb.jpg.14abe4e4eb2b6375326321f62fd8976a.jpg

     

    ASUS-ROG-CROSSHAIR-VIII-Dark-Hero.thumb.jpg.e2c58ef776efcb3946902e7d09d0b720.jpg

     

    kv.thumb.jpg.3f28f0f4be036e8e41c6ad6b8f1f6e92.jpg

     

    Enjoy!

     

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