0d error

Veghcs1973 wrote: 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

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!

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.

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.