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Crosshair VI Hero: UEFI build update thread

Level 13
Directly from Elmor:

Beta BIOS 3008 for C6H/C6HWIFI/C6E:

AGESA, temperature offset fixed after S3 resume, GPU Post function fixed, 0d with some GPUs fixed

C6H Test BIOS 0020 with AGESA 1007 (405200c4e299c1eed9a0044edec9aba51f37cee1d70caabe40b9485b0604521a)

In order to get back to an older version after flashing, you have to use USB BIOS Flashback.

Let me know how it works for you, especially regarding cold boot issues. Any confirmed bugs in the bug report form please

Beta BIOS 1501

* Workaround for some CPUs stuck at 22x ratio if using override voltage
* Fixes PCIEX4 bandwidth setting getting lost after power is removed
* Same DRAM boot behavior as 1403 (no cold boot fix)
* Same DRAM profiles as in 9920
* Still has the Vcore value issue when booting with Offset Mode and switching to Manual Mode

Crosshair VI Hero 1501 SHA256 EDE223DC6897B7199C93D9985E28B7A2CD1B8A8DB2DCBF3D3555A521DB4F045D
Crosshair VI Hero Wifi AC 1501 SHA256 0D9F51F43AA3A56A4AC984B11A52F58451B76F8A7CCB9A04E1C3194231C9D4DA

UEFI build 9920 for the C6H:

* Improved DRAM cold boot, results in slightly longer POST time
* Fix for CPU Ratio stuck at 22x on some CPUs when using Vcore override/offset
* SenseMi Skew is now Disabled by default. If you want to return to previous behavior set SenseMi Skew = Enabled and Offset = 272.
* Added DRAM profiles for Samsung B-based DIMMs with tuned subtimings, including The Stilt's settings

C6H beta UEFI 1403

* Fixed W_PUMP and AIO_PUMP speeds during POST
* Fixed Fan tuning sometimes failing
* Fixed a few issues with AMD USB3.1 ports
* Some tuning on DRAM settings, let us know how they work for you. tRDRD_Sc is still at 5 above 3500 MHz as it helps with stability. For performance you want to force this to 1. We'll consider changing this in future releases as the performance impact can be quite noticeable in certain applications.

An update on DRAM Boot Voltage, currently it should be 1.35V by default if the DRAM Voltage is changed. So if you're setting DRAM Voltage to above 1.35V, you might want to sync this setting. Additionally there might be scenarios where you will have better luck by syncing DRAM Boot Voltage to DRAM Voltage even at lower values.

AGESA 1006 RC4 official UEFI 1401

Just tested quickly 3600 memory and cold booting, seems good but you guys are going to have to help me test this before we have a judgement. Seems CPU temp reading from SIO now has -20*C offset for XFR enabled CPUs.

UEFI build 1107

Older test builds:

Test BIOS 0079

Test BIOS with new AGESA 1004a, with a couple of bugfixes. Up to 5% performance increases in specific applications. Also has P-state overclocking working with BCLK increase. If you want to keep C-states, make sure to set Advanced\AMD CBS\Zen Common Options\Global C-state Control = Enabled. There are two new settings under AMD CBS\UMC Common Options\DDR4 Common Options\ you might want to take a look at, Fail_CNT and ProcODT. Fail_CNT decides how many times to retry when DRAM training fails (F9 -> 0d), default is now 1. ProcODT can help improve your DRAM overclocking. There's a setting available also on previous BIOSes under AMD CBS\UMC Common Options\DRAM Memory Mapping named BankGroupSwap. If you have 2x Single-Rank modules you can try setting this to Disabled and you might see some performance boost in certain applications.

Test BIOS 0081

Same as 0079 but has ProcODT default = 53.3 ohm

Test BIOS 0082

Same as 0081 but with a DRAM compability patch for the below part numbers



Test BIOS 0083

Same as 0081 but with "2T" DRAM Mode when using above 2666 DRAM Ratio.
2,791 REPLIES 2,791

Level 7
Great work Raja/Elmor.

Could you maybe explain a little about how we would recognize if we needed 1T or 2T.

I have just read up what it means , just really want to know how i would notice if one is better than the other.

Is it a case of , on the 5xxx bios i could clock to 3200 , but it was unstable , and now on 0902 anything above 2133 is 0d .

Many thanks

Chipz wrote:
Is it a case of , on the 5xxx bios i could clock to 3200 , but it was unstable , and now on 0902 anything above 2133 is 0d .

In your case try the 1T UEFI with below 3200MT/s then. If it works, good, if not, flash the 2T one. Basically the 1T UEFI can(!) provide better performance, but with higher risk of RAM stability. Though some systems might be more stable on 1T with lower MT/s setting.

I've found better stability with 1T on my Corsair Vengeance LPX.

More bios please i want 3000mhz with my Corsair CMK16GX4M2B3000C15, dont sleep, work 24/7.:p
I only can do 2700mhz.

I've tested 1001 and it's look great than other versions. I have 2x8 vengeance led 3200. I can boot with 3200 mhz. Normal boot can't start windows but can control bios so no need clear cmos and if i use slow boot from bios, i can start the windows. It's not stable but i saw that i can use my rams with 3200 mhz on this mainboard. I can control fan expert from windows. Temp still 60 celsius, voltage looks stable (if turbo 4.1ghz normal with 1.526 volt) If i use 3200mhz system freezes for seconds. But its really stable with 2133mhz, and there is no freezes. I'll try gaming and i'll report here if there is freezes. Thanks a lot!!!

Great Bios the system is now what I would call stable is there any chance the cpu temp readings can be fixed I am using AIDA64 at the moment as it gives you the real temp reading it drives you nuts when you see 70c pop up in the bios.

Great Work a 100% improvement


1001 seems to be better for me, gradually bringing up the ram speeds.

I am also noticing some temp flutuations in AIDA, after looking have you got the sensor to CPU diode ? as this seems to match Ryzem masters temp .

Flashed to 1001.

Still stable at 41x multiplier and 100 clock to 4.1ghz on CPU @1.4 volts. As for RAM, I was able to decrease my timings from 12-14-14-30 to 12-12-12-30 at 2400mhz @ 1.4 volts.

T state is still at 2T according to HWinfo.

Another issue is voltage. Setting RAM to 1.35 volts only gives a reading of around 1.31, upping to 1.4 gives me the 1.35 needed to run the correct voltage through the ram. Ram kit is Corsair 8x2 2400/C10, which I'd like to be able to run at proper timings.

1001 looks to be amazing so far. Overclocking was completely trashed for me on 0902. Now i'm sitting at 3.8 on this wraith cooler at 1.35v and it's stable as can be with 100% load temps at under 55c. Night and day for me. Thanks guys!