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x370 fatal1ty K4 bios 7.03 for 5600x reboot loop

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M440 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote M440 Quote  Post ReplyReply Direct Link To This Post Topic: x370 fatal1ty K4 bios 7.03 for 5600x reboot loop
    Posted: 05 Aug 2023 at 1:14am
what does error code 66 say?
asrock b650m/hdv.m2, ryzen 7700x@85watt
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botagas View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote botagas Quote  Post ReplyReply Direct Link To This Post Posted: 04 Aug 2023 at 6:19am
Sorry for bumping this thread, but I am facing EXACTLY the same issue.

I was using Ryzen 7 2700. I used a 16GB kit at first, then added another 32GB kit (same make, model etc., but different dies). It failed to operate at XMP frequency, maxed out at 2933 with XMP timings. That was fine for me, I thought maybe it's the CPU or mobo issues and I was waiting for my new CPU to arrive anyways.

After the upgrade, I couldn't post at all. I removed the 32GB kit and saw these error codes: 33, 43, 7A, 60, 66/b6.

I removed the second 16GB stick and made it into the BIOS. Put in the second stick - can't post again. Removed the second stick, enabled XMP (so higher voltage and better timings), inserted second stick and now it boots.

However, trying to boot even with a single 16GB stick from the 32GB kit simply fails to post at all. I don't seem to be able to post with the 16GB kit in dual channel if XMP is not enabled as well (I assume too low voltage after CPU upgrade).

Any ideas? Perhaps you managed to fix your problem?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elkadillo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2022 at 6:14am
Hi, so I figured I'd reply to you since the post owner went mia.

I had the same issue. Switched from using Gskill TridentZ ram to Corsair Vengeance and everything is working now.
Very weird
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elkadillo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2022 at 2:51am
Yes, I must've re-flashed liked 7 times to make sure. Was successful every time and shows I'm running 7.10
Boots fine with 1700 but nothing with 5800X
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Post Options Post Options   Thanks (1) Thanks(1)   Quote neoset Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2022 at 2:44am
Originally posted by Elkadillo Elkadillo wrote:

I'm having exactly the same issue on the Fatal1ty X370 Gaming Pro
Using Trident Z memory 32000hz
Works fine with my Ryzen 1700 but when I install my 5800X I get the same exact debug codes with the same power cycle reboot loop.


Have you figured out the issue? I've been troubleshooting for around 10 hours already including reinstalling Windows. No luck so far.


Are you using 7.10 bios?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elkadillo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2022 at 2:37am
I'm having exactly the same issue on the Fatal1ty X370 Gaming Pro
Using Trident Z memory 32000hz
Works fine with my Ryzen 1700 but when I install my 5800X I get the same exact debug codes with the same power cycle reboot loop.


Have you figured out the issue? I've been troubleshooting for around 10 hours already including reinstalling Windows. No luck so far.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote neoset Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2022 at 5:12am
I read there are some problems with 7.03 bios on other x370 boards, like bootloops with 4 ram sticks. But for this board - Fatal1ty X370 Gaming K4, 7.03 is the last beta - there is no 7.10 or 7.20 yet...
Probably will not be able to go back to older stable bios if this one is causing problems with the memory or something.
That is why I'm searching for confirmation that it will work.
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Post Options Post Options   Thanks (2) Thanks(2)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2022 at 4:54am
Unfortunately a lot of people never come back and post when they fix their issue.
Usually it means they fixed the problem but we have no way of knowing if it was
thanks to the advice in their thread or they found another solution.

You should be able to upgrade to a 5800x on your board however, it is officially
supported. You can also post back here (in a new thread of your own) if you have
any problems. Even if you have issues you can find help here or make a ticket with
ASRock's Support staff. Someone will be able to help resolve any issue you have.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote neoset Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2022 at 4:51am
Have you fixed the problem yet?
I have the same board and wondering if I could upgrade the CPU to 5800x
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RLGL Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2022 at 9:14pm
Google search found:
What does 66 mean on motherboard?
Code 66 is often the system not able to find your OS.
Try a repair of the boot sector.
Asrock Z370 Gaming K6,Intel i7 8700K,
Asrock x570 Taichi

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