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

[M1RR0R]

do stupid programmers work in asus? can't find normal BIOS for crosshair impact, a lot of problems with the AMD 5000 series, blue screens (WHEA erros), reboots, reducing performance with active PBO, junk/no working fclk 2000+ and e.t.c

Edited December 8, 2020 by M1RR0R

[keeph8n]

1 minute ago, M1RR0R said:

do stupid programmers work in asus? can't find normal BIOS for crosshair impact, a lot of problems with the AMD 5000 series, blue screens, reboots, reducing performance with active PBO, junk/no working fclk 2000+ and e.t.c

Some of the best work for ASUS. Multiple BIOS have been on the Impact support site.

[M1RR0R]

1 minute ago, keeph8n said:

Some of the best work for ASUS. Multiple BIOS have been on the Impact support site.

i have already tried all versions of BIOS, including latest 2702, there is no complete stability on any

[t8y]

3003 seems OK, so far at least...

[Pr3mium]

With the 3003 Bios I had the most problems so far. 

GPU just got 8x PCIE 4.0 instead of 16x with 2702 Bios. Also I had random crashes and some games wont work. 

I rly hope that the new AGESA launches soon. 

[CornerJack]

First test under LN2 with Asus Crosshair VIII Dark and 5950X : https://hwbot.org/submission/4624385_cornerjack_cinebench___r15_ryzen_9_5950x_6508_cb
58 x 100 (1.5875v) - FLCK 1400 - 3800 MHz 14-13-13-28 (1.5v) - profil LN2 from BIOS SOC 1.35v PLL 2.1v VDDG CCD 1.15v

I have a few questions. Currently, I'm managing to bencher 5.8 GHz at Cinebench R15 at -155°C.
I was able to pass 5850 MHz but the score is a hundred points worse than 5800 MHz ?
The CPU also accepts to take full pot but I can't do better. After a few seconds of benchs, the PC reboot with a code A6 and impossible to make Cinebench again. If I switch from CPU score to Fire Strike, I can do 5.7 without any problem.
Do you have any idea why ? Thank you.

[Rauf]

On 12/11/2020 at 9:35 AM, CornerJack said:

First test under LN2 with Asus Crosshair VIII Dark and 5950X : https://hwbot.org/submission/4624385_cornerjack_cinebench___r15_ryzen_9_5950x_6508_cb
58 x 100 (1.5875v) - FLCK 1400 - 3800 MHz 14-13-13-28 (1.5v) - profil LN2 from BIOS SOC 1.35v PLL 2.1v VDDG CCD 1.15v

I have a few questions. Currently, I'm managing to bencher 5.8 GHz at Cinebench R15 at -155°C.
I was able to pass 5850 MHz but the score is a hundred points worse than 5800 MHz ?
The CPU also accepts to take full pot but I can't do better. After a few seconds of benchs, the PC reboot with a code A6 and impossible to make Cinebench again. If I switch from CPU score to Fire Strike, I can do 5.7 without any problem.
Do you have any idea why ? Thank you.

I haven't benched much ryzen so I might be wrong, but I would say unstable fabric due to too cold. Happens to my 5950X also when pushing temps close to cb temp. Works in idle but running benchmarks results in reboot.

Also half dividers have not been efficient for me either. I think bclk is a better option. 

[unityofsaints]

Impact with 5000 series doesn't seem to work - LN2 mode off = high CB, LN2 mode on = 92 every time you try to set anything in BIOS (even vcore!). This is on latest BIOS.

[Mahameru]

45 minutes ago, unityofsaints said:

Impact with 5000 series doesn't seem to work - LN2 mode off = high CB, LN2 mode on = 92 every time you try to set anything in BIOS (even vcore!). This is on latest BIOS.

This little board deserves more.. rarely seen any good result since B550 coming around

[noizemaker]

bios 3003 allows higher fclk, but i am not stable at 1966 with 5600x or 5950x..
please can we have a nice bios, looks like flck is working on hero with 3003..

[flanker]

higher PLL doesthelp u?

[noizemaker]

4 hours ago, flanker said:

higher PLL doesthelp u?

will try and report ?

[str8_an94baller]

any chance of dynamic oc being backported to c8 hero/formula?

[flanker]

No, it is based on hardware level, not only at BIOS level.

Edited December 17, 2020 by flanker

[chew*]

On 12/15/2020 at 8:09 AM, noizemaker said:

bios 3003 allows higher fclk, but i am not stable at 1966 with 5600x or 5950x..
please can we have a nice bios, looks like flck is working on hero with 3003..

define working are you looking to be stable or looking to bench. I'm not saying its impossible but i am saying its possible that it will never be stable due to the whea reports being cpu bus/interconnect. booting and running does not denote stability which both hero's lack at anything over 1900 in my testing.

 

Edited December 19, 2020 by chew*

[d0minat0r]

Any Idea why I have that bad score FCLK is 1800

[chew*]

11 hours ago, d0minat0r said:

Any Idea why I have that bad score FCLK is 1800

probably a similar situation as this.

 

Fmax scalar vs PBO.

4.6 avg clocks through CB

4450 avg clocks through CB

Although I noticed something when pushing dual CCX chips to the ragged edge that score is effectively half what you would expect leading me to believe 1 CCX has dropped.

 

[chew*]

On 12/17/2020 at 5:53 AM, flanker said:

No, it is based on hardware level, not only at BIOS level.

I've played with the feature. It's viable if your not setting your baseline at "prime stable clocks" but AMD does a better job at it if your target fixed clock is "prime stable clocks"

Right now other than that feature and or want the ability to SHOW a number higher than 2000 fclk or require the slightly improved vrm for benching on ln2 or just want a fanless heatsink solution I see no reason to upgrade to DARK. It's not bad, I like it but overall experience wise it runs and performs the same in the 24/7 stable department.

Edited December 20, 2020 by chew*

[NoMS]

On 12/12/2020 at 10:56 PM, unityofsaints said:

Impact with 5000 series doesn't seem to work - LN2 mode off = high CB, LN2 mode on = 92 every time you try to set anything in BIOS (even vcore!). This is on latest BIOS.

Same issue here using a 5950X with 3003 bios I had to rollback to 2311 to fix that.

3003 works fine with 5800X on LN2 tho

C8I here.

Edited December 25, 2020 by NoMS

[chew*]

safedisk can you add poor mans impact to the front page? ASUS ROG X570-I

[noizemaker]

Version 3101 Beta Version

2020/12/25 20.22 MBytes

ROG CROSSHAIR VIII DARK HERO BIOS 3101
Improved system compatibility
Updated AGESA code to ComboV2PI 1190
Updated graphical firmware
Improved RAID function
Improved system performance

https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/ROG_CROSSHAIR_VIII_DARK_HERO/ROG-CROSSHAIR-VIII-DARK-HERO-ASUS-3101.ZIP

 

Version 3101 Beta Version

2020/12/25 20.22 MBytes

ROG CROSSHAIR VIII IMPACT BIOS 3101
Improved system compatibility
Updated AGESA code to ComboV2PI 1190
Updated graphical firmware
Improved RAID function

https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/ROG_CROSSHAIR_VIII_IMPACT/ROG-CROSSHAIR-VIII-IMPACT-ASUS-3101.ZIP

Edited December 26, 2020 by noizemaker

[sammurai]

Have anyone tried this beta BIOS on Impact?

Maybe FLK can now go above 1866 mhz.

[Achill3uS]

I've benched yesterday for a couple hours with bios 3101 and an 5950x, seemd fine for first look. Even ln2 switch was working and no stupid high cb (-20C) post issues with it like in earlier bioses.

[sammurai]

I tried also this beta BIOS with no issues except the fact that the CPU is running at 4.450 mhz in CB20 instead of 4.500-4.525 mhz all cores with BIOS 3003. No improvement for FLK, still limited to 1.866 mhz.

As a result I returned to 3003.

[Achill3uS]

On 1/1/2021 at 9:32 AM, Achill3uS said:

I've benched yesterday for a couple hours with bios 3101 and an 5950x, seemd fine for first look. Even ln2 switch was working and no stupid high cb (-20C) post issues with it like in earlier bioses.

I've revisited yesterday this bios and it seems my cpu has no CB and CBB at -162C with fclk 1433, board worked like a charm. Best bios so far according to my experience.