If nothing in logs you can try with esxcfg-info even in "esxcli hardware memory " not much information available.
if you are using hp may be ilo can also help ... if you would like to check the hardware status, HP smartstart is also good tool ...
only get is available
~ # esxcli hardware memory
Usage: esxcli hardware memory {cmd} [cmd options]
Available Commands:
get Get information about memory.
~ #