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X670 resource


ill use this thread to collect some new test bioses for the boards, maybe also to explain some less understood options

to disable cores ccd go here and choose ccd xx bit map down core.
each ones stand for an enabled core
best to disable from the back, ie:
instead of 0011000
after selection press downcore apply changes or discard if made mistake


7950x not boosting pass 5.5G -> check that CStates is not disabled
Detailed Explanation on CState Boot Limiter

Test BIOSes:

X3D OC Preset for those MB with asynch BCLK Support: (for simple slight perf boost for X3D)

DOCP/EXPO Tweaked: (for simple timings tightening)

strixe-e 1515 

strixe-f 1515 

strix e a 1515 

crosshair hero 1515 

crosshair gene 1515 

crosshair extreme 1515 

creator 670 1515

creator b650 1515

strix 650E I

strix 670 itx



for crosshair and strix e-e:

explanation of segment2 Loadline:


customize a heterogenous loadline for a dual segment workload range.

example above shows loadline=L6 when current is in range of 0~40A, and Level4 when current is above 40A.




Adds for x3d

dynamic ccd priority switch with core flex, os / driver agnostic so win10 win11 ok



Algo as follows:
If condition reached and ccd0 specified, then check current mem/cache activity > threshold and hysteresis reached, if fulfilled then switch
If condition reached and ccd1 specified, then check current mem/cache activity <=threshold and hysteresis reached,, if fulfilled then switch
Default hysteresis =4

Can combine multiple algos for ccd priority so combinations are wide

works on non x3d too but of course senseless on it. detailed explanation here.

2,385 REPLIES 2,385

Level 9

 My system refuses to start even with a regular CL50 at 6000MHz in a 16x4 setup (A-die, 7200Mhz XMP).

I also observe errors at 5600 with JDEC timings.
1807 is incredibly bad for a 16x4 setup.

On version 0922, this memory produced the following results


I think this generation of AMDs is bad at running 4 sticks of RAM at decent speeds that's why I went for 2x32GB myself

No. Memory sticks can do 28-36-36-28@6000.

They have already done this on bios version 0922.

Literally nothing has changed in the system.

The only thing that has changed is the BIOS version.

The problem is 100% in the firmware.

Looking at your screenshot from ZenTimings, you used to have 1.4V SoC, which I don't think is possible anymore in the latest BIOS. There was this thing where CPUs got damaged due high SoC and AMD worked with board partners to lock it to 1.3V max.

Maybe that is the culprit reason?


Here is 1709 with lower voltages. 

@ksenchy Purchased a new A-Data kit (AX5U6400C3232G-DCLABK, Hynix A-die, 2x32Gb) with built-in EXPO profile for 32-39-39@6400.

Did a full CMOS reset, only chose EXPO I.

Here's a screenshot of Zen Timings.


Voltages are even higher than on my manual overclock for 6000 at 4x16.

P.S. - based on the tests I ran, it's super stable, no errors in any test - TestMem5, anta777@extreme, y-cruncher for 3 hours.


Congrats, you should lower tRFC (I think 400 should work on A-die at 6400) and increase tREFI to 50000 for some free performance

As already mentioned, applying this much VSOC is no longer possible due to AMD's revised guidelines. Changes in CPU ucode and voltage rules may impact stability with certain configurations, especially when running in 2 DIMMs per channel.

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Level 8

Bios 1807.png


Level 9

I am running 1807 since release on my X670E Crosshair Extreme and today when I booted my computer it went directly to the BIOS and all M2 SSDs were missing (same issue like version 1806).
After a reboot the SSDs were directly detected again.

Unfortunately I have no idea how to reproduce it

AMD Ryzen 9 7950X3D | ROG CROSSHAIR X670E EXTREME | PNY RTX 4090 XLR8 | 32GB Corsair Vengeance RGB 6000 CL30
AMD Ryzen 5700X | Asus Prime B350 Plus | Sapphire RX570 | 32GB Corsair Vengeance LPX DDR4-2666