RUIPRO 8K Detachable Full Fiber Optic Armored HDMI 2.1 Cable 130FT, Ultra High Speed 48Gbps, Support 8K@60Hz 4K@120Hz, Dynamic HDR, eARC, Compatible with PS5/Xbox/Blu-ray/TV/Monitor/Projector

So I do exactly this, I have my Office 5090 machine also running to my living room 85" screen. I use a 150ft hdmi 2.1 fiber optic cable, works perfectly *Gsync and everything*. Protip, get a powered cable so you can setup a smart switch to kill the power to it, that will allow you to disable the living room feed with a smart home system *I use homekit + Home assistant and program it with my sofaboton, so turning on the HTPC switch will power the fiber hdmi cable, alerting windows to switch screens and turn off my office screen, works great and way better than a software solution* Buy this fiber cable: amazon.com/dp/B0DZ27HKPK?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_3 They support both HDMI and Displayport swappable ends, and its super easy to pull through the attic. Do not buy the cables that have premade ends on them. Regarding hdmi or displayport, with the cable I'm recommended you could buy either (I use HDMI) amazon.com/dp/B01EV33R8S?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_14 this is the USB over ethernet system I use, and its work reliably for 8 years. Highly recommended. Your audio will be carried on via HDMI (or displayport) on the fiber run.