I have a Asus M4A785G-M Evo Motherboard. It has Gigabit Ethernet (10/100/1000) but anywhere I check within windows, it says my connection is max 100mbps. I am pretty sure 100mbps won't be that different from 1000mbps, but I really want to use my full potential. I use CAT 5e cables although I do plan on upgrading to CAT6, CAT6a, or CAT7 in the future.
CAT 5e can handle upto 1000mbs, but you its usless for home users using internet,,
u must also have gigabyte Ethernet switch or router with gigabyte internet connection to experience the difference
until now internet available in MBs, google & some of telecoms in Korea planing for 1 GBbs ...
its useful only in highly available data processing places , like datacenters & web servers ..