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Just some feed back about memory timing.
Since many years I have a 1700 CPU and I was unable to get a DDR memory running higher than 2133 Mhz.
As I want to switch to a 3800X CPU, yesterday I flashed the bios 6.40 from 5.60.
And then bingo, my 1700 CPU is running DDR at 2600 Mhz (or higher)!
5.60 seems to be a crappy bios regarding memory timing.

Next step will be to insert the 3800X CPU.
 

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This weekend I have updated the X370 Taichi with a 3800X cpu and a RX 6700 graphic card.
I flashed the bios 6.40 and then the bios 7.00.
The motherboard behaves properly at stock speed (for now) but I had to make a fresh install of W10.
Without a fresh install Windows was stuck on the logon with the rotating dots.
Windows is really a shame, needing a fresh install each time the processor is changing.
I tried the FarCry 6 benchmark and the average FPS is 98 frame/s in 1440p.
This motherboard is really rock solid.
 

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I got some bios issue when using an add-on PCIe Raid controller card.
With some bios (i.e.: 7.00) I do not see the bios from the Raid card before the ASRock bios shows up.
Bios 6.40 was showing it properly.
Is there a workaround?
 

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@SpotAnime "I really want to upgrade from my 1700x to my 5700x but have anxiety "
I did an upgrade from Ryzen 1700 to Ryzen 3800X.
Bios: 5.6 (1700) -> 6.40 -> 7.0 (3800X)
I did not have to reset any bios or change manually any bios value during the update from USB key.

But I got an issue: I had to do a blank install of W10 as the 1700 and the 3800X are seen as two different processors.
What a shame Windows!
 

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@quicknick I got a similar issue when upgrading this board from Ryzen 1700 to Ryzen 3800X.
All went well but the 2 processors are seen by Windows 10 as different and it needs a fresh install of W10.
I was mad at it but after loosing a lot of time I did a new fresh W10 install.
I do not use fTPM or Bitlocker and never get the message about them.
 

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@quicknick "RAM model is CMK16GX4M2B3200C16"
I have the same RAM as you with 4 units.
It will never run at 3200 Mhz : with the 4 slots full you have to lower the speed (X370 chipset is rated to 2600 Mhz).
The best I got for now is 2800 Mhz with a 3800X and XMP profile activated in the bios.
 

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You seem to be turning around the DDR behavior.
Make a simple test: go to the bios, select the slowest non XMP speed available in the DDR profile and test if all the system is booting well.
If it is booting well and stable: run the DDR at low speed until you by a new set more performant.
If it is not booting properly, it is that the issue is elsewhere.
For your tests with 2 different motherboards, it does not seem that the X370 Taichi is faulty.
Good luck.
 
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