My network cabling is (I believe) CAT-6.
It wouldn't make any difference. CAT5 will work at gigabit up to the full 100M max. The much shorter distances within a home make it even less critical. While running CAT6 is a good idea, to be ready for 10G, it's harder to work with and provides no benefit to home users at gigabit. It also requires connectors designed to work with it.
I haven't lost my mind. It's around here...somewhere...