0d error
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=92500
Printed Date: 06 Sep 2025 at 7:18am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: 0d error
Posted By: Veghcs1973
Subject: 0d error
Date Posted: 26 Jan 2025 at 11:12pm
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Hello everyone I recently bought an asrock extreme4 B550 motherboard, installed an AMD Ryzen 9 5900X processor, transferred the Kingston KF436C18BBK2/64 from my previous PC 64GB (32GB 4G x 64-Bit x 2 pcs.) DDR4-3600 CL18 288-Pin DIMM Kit DDR4 Dram, my problem is that if I install them in dual channel configuration, they do not work and immediately generate a 0d error, and from there I cannot go further to the bios menu with any known method, and so it is impossible to manually configure them, in the A1 A2 socket in single channel mode they work perfectly |
Replies:
Posted By: NDRE28
Date Posted: 27 Jan 2025 at 8:31pm
Hi! What happens if you insert both DIMMs in channel B (B1 + B2)? If it doesn't work with the DIMMs in channel B, you might have a damaged memory channel! NOTE: Do a CMOS reset before doing any change! |
Veghcs1973 wrote:Posted By: Veghcs1973
Date Posted: 27 Jan 2025 at 11:30pm
| I've cleared the CMOS a few times, tried the B1 and B2 slots one by one, no results, again 0d error, well the motherboard is brand new, a few weeks old, even after the first assembly, the B1 and B2 slots didn't work, 0d error, it's not like the new motherboard I'm unpacking is malfunctioning |
Posted By: Veghcs1973
Date Posted: 28 Jan 2025 at 12:14am
| I would rather guess that the motherboard cannot operate this DRAM in 3600 MHz dual channel mode. If possible, I will try a different type and a smaller 3200 MHz DRAM. |
Posted By: Veghcs1973
Date Posted: 06 Feb 2025 at 11:38pm
| No matter what ram I put in slot B1 or B2, it immediately 0d error and does not work with any known method, but in slot A1 A2 everything works without error |
Posted By: Xaltar
Date Posted: 07 Feb 2025 at 2:37am
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It sounds like your 5900x might have a bad memory controller. The IMC (integrated memory controller) is located on the CPU and has 2 channels, one for the A slots and one for the B slots. If one of the channels is bad then the issue you are experiencing would happen. If you can, I would RMA that CPU. As one of the more expensive components in your system I wouldn't take a risk on not returning it. Bad memory controllers are sadly quite common failure points on new CPUs these days. Generally speaking, they either arrive already failed out the box or fail very shortly after being set up. If the system remains stable for a week or more it's unlikely you would encounter an error with the IMC. I hope that makes sense. Basically the IMC fails at the start or not at all. Good luck. ------------- 
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Posted By: Veghcs1973
Date Posted: 08 Feb 2025 at 2:59am
| What is the explanation for the fact that the motherboard, CPU and everything work perfectly and stably in single channel mode? |
Posted By: NDRE28
Date Posted: 08 Feb 2025 at 3:13am
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Hi! As I see it, just like Xaltar already said, it's one channel of the memory controller of the CPU that's faulty. The other possibility is that the B channel of the motherboard is faulty. I'd do this test, if possible, I'd replace the CPU with another one, to see if the problem gets solved. If replacing the CPU doesn't solve the problem, then the problem is the motherboard. (You could also take out your CPU, and use it on another motherboard, to see if it runs normally on that motherboard). |
Posted By: Veghcs1973
Date Posted: 08 Feb 2025 at 3:21am
| The problem is that everything is brand new, what are the chances that the new factory-packaged processor and motherboard are both defective? |
Posted By: Veghcs1973
Date Posted: 08 Feb 2025 at 3:27am
| If the processor is faulty or damaged, it will not work in any mode |
Posted By: Xaltar
Date Posted: 08 Feb 2025 at 3:30am
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It only works using channel A, that means there is a good chance channel B on your memory controller is either completely dead or can't handle your particular RAM kit (in which case it is defective). As I said before the IMC on the CPU has 2 channels, A and B. If one is working then using that channel would result in a stable and fully usable system. You can try checking your CPU for any missing or bent over pins, that can also result in a channel dropping out but it's unlikely. The odds of a single pin being perfectly bent in such a way that the CPU still fits in the socket is low. The way the system RAM operates faster is by using 2 channels to the CPU. 2 channels means double the bandwidth to and from the CPU and RAM. A single channel working means the system still works but the performance takes a hit. Dual Channel vs Single Channel performance. The system is behaving as if you only have 1 stick of RAM installed because both are being accessed through a single channel rather than split between 2. Basically the connection between the CPU and any RAM you install in channel B is cut and given it's broken inside the CPU itself there is no way to fix it. The CPU can still see and use RAM in channel A however so the system continues to function normally given the RAM channels function independently of one another. Like pulling a spark plug lead off a 2 cylinder engine while it's running, you lose some power but the engine will continue to run. In the case of a CPU however it won't damage the system to do so, you just lose half your peak memory bandwidth. If the CPU is new I would return it, simply because it isn't functioning correctly, even if it is stable. If it is out of warranty there is no problem using it in single channel, all you sacrifice is some RAM performance and in most use cases you wouldn't notice the difference anyway. I hope that makes sense. -------------
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Posted By: Veghcs1973
Date Posted: 08 Feb 2025 at 3:40am
| Well then I'm using this in channel mode, can see all 64 GB, I'm not spending any more money on this PC |
Posted By: Xaltar
Date Posted: 08 Feb 2025 at 9:48am
That is entirely up to you  Sorry I couldn't be of more help, you can try opening a support ticket with AMD directly regarding your CPU, they may be able to help you out more. Good luck. -------------
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