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It's usually safe, but sometimes it breaks stuff. For example, one of my laptop's graphic card is really picky. I updated a kernel one time and it reverted to the open source driver. Which is fine in most case, but for that machine I needed the proprietary version. Another kernel update fixed it. I'm currently running 4.13 and don't intend to attempt 4.14 for quite a while. Still too many unaddressed bugs.
I'd say that if what you have now is working okay, just leave it for now.
It is working great so I'm glad I asked. Thanks Mr. C....
Try 'free' Should have a 'man' and 'info' page, as well.
[user@localhost ~]$ free --help
-b, --bytes show output in bytes
-k, --kilo show output in kilobytes
-m, --mega show output in megabytes
-g, --giga show output in gigabytes
--tera show output in terabytes
-h, --human show human-readable output
--si use powers of 1000 not 1024
-l, --lohi show detailed low and high memory statistics
-o, --old use old format (without -/+buffers/cache line)
-t, --total show total for RAM + swap
-s N, --seconds N repeat printing every N seconds
-c N, --count N repeat printing N times, then exit
--help display this help and exit
-V, --version output version information and exit
For more details see free(1).