I don’t have enough ethernet ports on the back of my router so i recently bought an ethernet splitter. When it got here i plugged it in and it was working perfectly fine for my ps5 but my cat8 to my pc wouldn’t connect. I checked the splitter and it says cat7. Would i have to order a cat8 splitter for my cat8 cable to work or is there another solution?
You want a switch, not a splitter.
A splitter is for running two 100 Mbps connections over a single 4 pair cable, and it uses splitters at both ends of the cable.
Most splitters aren’t even that. They connect both devices over the same 4-pairs. So it only works if one of the devices is powered off.