Long ethernet cables?

[woeful bobcat]

Hi, so recently built a PC and put it upstairs away from my router. Ping in-game is fine (like 25/30ms) but download speeds over WiFi are like 15mbps (seen it drop to 0mbps many times) - takes FOREVER to even download a 2gb update on a game.
Was thinking of using a long ahh ethernet cable over 20 metres. Is this a good shout ?
Downstairs on my ps5 I easily get 200mbps downloads

I've heard people saying CAT8 Is bad for long distance and to go for CAT6A instead. How true is this ?

[plucky reef]

cat8 is just overpriced

it’s functionally a useless spec

there isn’t a single rj45 port you will ever see above 10g

so it being rated for “40gb” is useless

just get Cat6a

[vague wasp]

cat6a is the most anyone ever needs for ethernet

cat6 is fine for most homes as your runs are rarely more than the 55m maximum distance at 10Gbps

[plucky reef]

any overly long runs should be cat6a, anything under like 10ft doesn’t matter anyways

you can fairly easily run 10gbps on cat5e at <10ft

just never buy anything below cat5e