[AMD][Intel] Non-binary DDR5

[cyring]

DDR5 Query

• What is “non-binary” memory?

• To decode the 24GB or 48GB DIMM geometry, can anyone dump some registers ?

[AMD] Zen 4 or 5

• 7950X: DIMM 24-48 GB
• You will have to compile the zencli

# Compile the tool
cc zencli.c -o zencli

• Run it as root on the first four channels to dump the memory controller configuration

# channel 0
./zencli smu 0x50100
# channel 1
./zencli smu 0x150100
# channel 2
./zencli smu 0x250100
# channel 3
./zencli smu 0x350100

• In the DdrType bits-field I expect to find some new DDR5 type values or something in the Reserved part

[Intel]

• I still have found no IMC register about non-binary DDR5

[cyring]

Micron

Notes: 1. For non-binary densities, a quarter of the row address space is invalid. When the MSB address bit is HIGH, the MSB-1 address must be LOW.