Looks like the same issue I’ve had: (SOLVED) 2 identical CPUs i7 6700 gives different results - #17 by 786sam
you can check/compare # of RAM channels with following command:
dmidecode -t 17 | awk ‘BEGIN { FS=“:”; OFS=“\t” } /Size|Channel/ { line = (line ? line OFS : “”) 2 } /^/ { print line; line=“RAM” }’ | grep -iv ‘no’
In my case it was
RAM 16384 MB ChannelA-DIMM0
RAM 16384 MB ChannelA-DIMM1
RAM none ChannelB-DIMM0
RAM none ChannelB-DIMM1
Instead of
RAM 16384 MB ChannelA-DIMM0
RAM none ChannelA-DIMM1
RAM 16384 MB ChannelB-DIMM0
RAM none ChannelB-DIMM1