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CAT6 cable contains four pairs of copper wire and unlike CAT5, utilizes all four pairs. CAT6 supports Gigabit (1000 Mbps) Ethernet and supports communications at more than twice the speed of CAT5e, the other popular.
To get pure Gigabit, you'd want to switch to cat6 cabling -- so yes.. you'd likely have to redo the cables, unless you happen to have 5e right now..
Ultimately, having to update NICs and cabling isn't really worth it, especially for a home user. If you need speedy connections between only two computers, you could try serial connections like firewire..
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