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ROG Crosshair VIII Hero / Formula / IMPACT LN2 OC Guide

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Posted (edited)

LN2 BIOS 

ROG CROSSHAIR VIII HERO / FORMULA 0042 BIOS

HERO : https://bit.ly/2khTp8s

HERO WIFI https://bit.ly/2kxYF7O

FORMULA : https://bit.ly/2L9an3z

 

ROG CROSSHAIR VIII IMPACT 0044 0045 BIOS

IMPACT : https://bit.ly/2ZpvQO9 

0044 = Fixes memory divider issue, normal BIOS, have memory fail count recovery mode. 
0045 = Fixes memory divider issue, no fail count recovery mode. Can use retry button forever.

 

Official BIOS 

ROG CROSSHAIR VIII HERO / FORMULA 1001 BIOS

Update AM4 combo PI 1.0.0.3 patch ABBA to improve system performance
Before running the USB BIOS Flashback tool, please rename the BIOS file (*.CAP) using BIOSRenamer.

HERO https://bit.ly/2kC6b1N

HERO WIFI https://bit.ly/2klm900

FORMULA : https://bit.ly/2khseuf

 

ROG CROSSHAIR VIII IMPACT 1001 BIOS

Update AM4 combo PI 1.0.0.3 patch ABBA to improve system performance
Before running the USB BIOS Flashback tool, please rename the BIOS file (*.CAP) using BIOSRenamer.

IMPACT : https://bit.ly/2kL8krS

 

OCPACK

Turbov and CCX OC Tools : https://bit.ly/2MHzo7X

MemTweakIt : https://bit.ly/2UhX8An

Zen Perfboost : https://bit.ly/2kBs15c (After loading CineBench R15 or Geekbench3 bench then run the boost, just click defaults button after benching to prevent bsod)

 


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 1.55v 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

 

Enjoy!

 

Edited by safedisk
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good guide, u can update it also with your results+photos, it is welcome :) I have FB, but not all of us have FB :)

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On ‎7‎/‎9‎/‎2019 at 5:40 PM, flanker said:

good guide, u can update it also with your results+photos, it is welcome :) I have FB, but not all of us have FB :)

 
i see, I will add photos too.

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On ‎7‎/‎9‎/‎2019 at 6:24 PM, Bruno said:

cool. thank you!

thanks! bro

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On ‎7‎/‎9‎/‎2019 at 6:50 PM, Samsarulz said:

Thanks for the info. Just guessing how will it be with Crosshair VII + Ryzen 3000

thanks! I have not tried OC in the C7 series yet. haha

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Posted (edited)

GEEK3 and Hwbot 4k tip

 

The fclk clock is very important for the above two benchmarks.

must change the fclk clock and the cpu clock to find the highest clock value that can be run.

fclk The higher the clock, the lower the cb temperature.

 

good luck

screen077.thumb.jpg.269845c854032084aa288f67adf9e1fb.jpg

screen082.thumb.jpg.b22e74718a5446f9a87a8d94e5d4231c.jpg

 

Edited by safedisk
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Is there a LN2 BIOS for the regular VIII Hero? The BIOS posted is for WIFI version and my board gives an error when trying to flash.

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On 8/24/2019 at 10:54 PM, aerotracks said:

Is there a LN2 BIOS for the regular VIII Hero? The BIOS posted is for WIFI version and my board gives an error when trying to flash.

I will check the bios. Please wait

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6 hours ago, M1RR0R said:

links do not work :(

I have confirmed this problem. i will fix the link soon. sorry

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On 8/24/2019 at 10:54 PM, aerotracks said:

Is there a LN2 BIOS for the regular VIII Hero? The BIOS posted is for WIFI version and my board gives an error when trying to flash.

Non WiFi Hero bios Upload You can download

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Posted (edited)

C8I 0050 BIOS agesa 1.0.0.4

 

Fix Incorrect MemClkFreq above DDR-5000.
Add micron/spectek DDR4-5000 auto tuning rule.
Add SK Hynix DJR DDR4-5000 memory preset.
Add memory OC fail count, 0 is disabled will not recovery setting and enter safe mode, max 10-times retry.
Add BCLK fraction function.

No cb

https://www.dropbox.com/s/uq3l4dsy5xqfljd/ROG-CROSSHAIR-VIII-IMPACT-ASUS-0050.CAP?dl=0

Edited by Alex@ro
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