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Total memory varying between identical nodes

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On a cluster with multiple identical server nodes (same hardware including same brand and model for the DIMMs, same BIOS and firmware versions), same OS and same kernel options (PXE boot of the same RHEL 8.2 image), the total memory capacity is varying.

[root@node1 ~]# cat /proc/meminfo 
MemTotal:       196349760 kB

[root@node2 ~]# cat /proc/meminfo 
MemTotal:       196350128 kB

After reflashing the BIOS:

[root@node1 ~]# cat /proc/meminfo 
MemTotal:       196349764 kB

After another power cycle:

[root@node1 ~]# cat /proc/meminfo 
MemTotal:       196349760 kB

Why is it varying and is there a way to make sure it won't change anymore.

I have a script which depends on the amount of total memory.

mangohost

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