I guess both of you assume that the dbcache will be adjusted accordingly, otherwise I suppose 8GB vs 32GB doesn't make a difference, if you only use 600 MB of it.
I've never tested it, and I don't have spare systems with 32 GB, but I assume Linux file system cache can handle most of the work
dbcache does.
Other than that, I did indeed assume the correct settings to use the available RAM.