@theresnotime

Should still be enough for 5Gbit and if you're lucky even 10Gbit from what I've been told. Still can't quite believe that things improved that drastically from when I started into the industry though...

(2.5G I can confirm, that worked over a few meters of shitty cat5 a few weeks ago when I tested it)

Edit: Wikipedia says 2.5G is the max for Cat5.
CAT6 can do 10GBASE-T over 55m
CAT6a over 100m

Some on reddit said Cat5 can do 10Gbit depending on factory tolerances as well.