Back in 2015/16, me and my Dad ran Cat6 cables all over my house to each room that required it (My office, bedroom, bathroom (this one stays in the ceiling for AirPlay speakers), Living Room, Dining Room, and Garage) which all terminate in a cupboard in the centre of the house to an 8 port gigabit Netgear switch.

All that cable came of a spool. All the cables for connecting devices onto the network downstream are cables either provided with the devices in the box, or cables that my dad gave me from his jobs over the years.

I had a bottleneck causing my Steam Link to not show on my Apple TV as best quality, if another device accessed the PC that Steam was running on (It's my house's central server). As well as a few other problems like wifi was slower on one AP than the other.

All the cables were either unmarked, or Cat5e, so I thought to hell with it, i'll jump on amazon, and buy myself as many Cat 8 cables as I need to replace everything, so the "worst" cables will be the Cat 6 spanning to every room. I know that any traffic going from room to room will only go at Cat 6 speeds, but at least I know the Cat 8 cables aren't a bottleneck, right?

My question: is Cat 8 overkill for home use? I was going to replace the Cab-Office cable with Cat 8 too as thats where my PC resides, and it's the main backbone that outward traffic (as well as internal traffic to my PC) would go, then slowly replace the easier to access cables over time.

Before I pull the trigger, is this sensible? The cost between cables is negligible to me as this is my hobby.