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Z370 Extreme4 XMP bug
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DocBrown View Drop Down
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DocBrown Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2018 at 9:52pm
Guys, I don't see the 1.40 BIOS on the ASRock page anymore.
Kind of glad that I didn't update yet, I suppose? Maybe it was rushed?

System runs fine since early December with Flode's "fix" btw.
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Glad I found this thread. Just built my first pc:
Asrock z370 extreme 4
Intel i7 8700k
2x 8gb G.skill ripjaws V 3200mhz ddr4
MSI Geforce GTX 1080
Samsung 850 evo 500gb ssd
Windows 10

The system ran fine at stock ram speed of 2133mhz. But trying to use the xmp profile I ran into the following problems:

-System hangup anywhere from 10 seconds to 3 minutes after startup. No mouse or keyboard response.

-No mouse response in bios

-shutting down in Windows would turn the monitor off but the tower would stay on indefinitely until you hood down the power button.

-mouse and or keyboard would shut off completely, no more backlight.

-bios would revert to stock ram speed on its own

I used Flodes suggested settings and haven't had an issue since! Thank you!
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Points: 14 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wond1r Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 2018 at 11:51pm
Originally posted by techdiver techdiver wrote:

Made the changes to the RAM voltage suggested by Flode. So far it seems rock solid. Many thanks to Flode for his work. My machine is now stable.

Even have it OC'd to 5GHz with 50 millivolt offset. So far everything is rock solid. Using an air cooler and keeping temperatures around 75 or 76 under load.
That's awesome I still really hope AsRock pushes out a bios with a fix for the issue because I can only imagine there will be 100s if not 1000s of people who will either never figure this out or will replace the board with another manufacturers 
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techdiver View Drop Down
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Made the changes to the RAM voltage suggested by Flode. So far it seems rock solid. Many thanks to Flode for his work. My machine is now stable.

Even have it OC'd to 5GHz with 50 millivolt offset. So far everything is rock solid. Using an air cooler and keeping temperatures around 75 or 76 under load.
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wond1r View Drop Down
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Originally posted by urkal urkal wrote:

Looks like the main reason I don't freeze is because of using offset voltage instead of fixed voltage and lowering Cache ratio.
Yeah, that would be why I wonder if AsRock ever plans to fix it
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Originally posted by wond1r wond1r wrote:

Originally posted by techdiver techdiver wrote:

Just registered here say that I too am experiencing the same issue. I was so relieved to find this thread. I had built a new system last week using the Z370 Extreme4 with the i7 8700k and Corsair CMK16GX4M2B3200C16 Vengeance LPX 16 GB (2x8 GB).

I started experiencing these random freezes whilst the system was idle. I had changed the ram to XMP Profile in the bios. I was initially running 1.1 but updated to 1.4 and as everything reverted to default in the bios the issue seemed fixed. I then went and readjusted my settings in the bios to the previous (custom fan speed and xmp etc) and the issue returned.

It was then I did some specific googling and found this. Amazes this hasn't been fixed by asrock as of yet? Do they even monitor these forums?
Probably not very actively, Did you attempt to fix your issue by adjusting the VCCIO and VCCSA as suggested by Flode on page 1? thats pretty much the only thing you can do now unless they push out another bios update including that fix.

I hadn't got a chance to test that yet. I will do so this evening when I'm home and report back. Cheers.
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Looks like the main reason I don't freeze is because of using offset voltage instead of fixed voltage and lowering Cache ratio.

Edited by urkal - 19 Jan 2018 at 7:20pm
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wond1r View Drop Down
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Originally posted by techdiver techdiver wrote:

Just registered here say that I too am experiencing the same issue. I was so relieved to find this thread. I had built a new system last week using the Z370 Extreme4 with the i7 8700k and Corsair CMK16GX4M2B3200C16 Vengeance LPX 16 GB (2x8 GB).

I started experiencing these random freezes whilst the system was idle. I had changed the ram to XMP Profile in the bios. I was initially running 1.1 but updated to 1.4 and as everything reverted to default in the bios the issue seemed fixed. I then went and readjusted my settings in the bios to the previous (custom fan speed and xmp etc) and the issue returned.

It was then I did some specific googling and found this. Amazes this hasn't been fixed by asrock as of yet? Do they even monitor these forums?
Probably not very actively, Did you attempt to fix your issue by adjusting the VCCIO and VCCSA as suggested by Flode on page 1? thats pretty much the only thing you can do now unless they push out another bios update including that fix.


Edited by wond1r - 19 Jan 2018 at 6:05pm
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techdiver View Drop Down
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Just registered here say that I too am experiencing the same issue. I was so relieved to find this thread. I had built a new system last week using the Z370 Extreme4 with the i7 8700k and Corsair CMK16GX4M2B3200C16 Vengeance LPX 16 GB (2x8 GB).

I started experiencing these random freezes whilst the system was idle. I had changed the ram to XMP Profile in the bios. I was initially running 1.1 but updated to 1.4 and as everything reverted to default in the bios the issue seemed fixed. I then went and readjusted my settings in the bios to the previous (custom fan speed and xmp etc) and the issue returned.

It was then I did some specific googling and found this. Amazes this hasn't been fixed by asrock as of yet? Do they even monitor these forums?
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yakuman View Drop Down
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I have a similar problem with my Z370 Taichi on BIOS 1.30 and 1.40 and seem to recall the XMP Profile 1 recognized my 2666 RAM on BIOS 1.20 before....but I don't have any issues with high VCCIO and VCCSA numbers.  Manually entering the frequency works, but the other latency numbers are higher than native specs if everything else is left on Auto, making them non-optimized.  I don't know what numbers to input in those other hundreds of fields to correctly adjust nor should I; that's the point of XMP to begin with.  I don't want to mess with guessing what numbers to enter as it keeps crashing and won't even load the UEFI screen after saving the settings & rebooting the PC.

Update: After troubleshooting with ASRock support, I discovered one of my RAM modules failed to reach 2666 at its advertised timings.  The other one was fine, so it's a hardware problem on my sideDead


Edited by yakuman - 19 Jan 2018 at 11:01pm
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