will this help?
https://www.amazon.de/-/en/YIWENTEC-DisplayPort-7680X4320-Bi-Directional-Transmission/dp/B089QD7QHF/ref=sr_1_4?keywords=3m%2Bmini%2Bdisplayport%2Bauf%2Bdisplayport%2B1.4&sr=8-4&th=1
You could try this one to reduce the speed of the fans. not sure if it will effect the RGB speed
https://www.newegg.com/en-labs-pcifanco8spr-metal-fan-speed-controller/p/376-0067-00009
What OS are you using?
There are only Windows XP/2000 drivers available on the DynaBook website.
https://support.dynabook.com/support/modelHome?freeText=438069&osId=3333637
Windows Vista should have come with the driver.
It seems that the router ports are only 10/100 BaseT
https://www.asus.com/us/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RTAC51U/techspec/
RJ45 for 10/100 BaseT for WAN x 1, RJ45 for 10/100 BaseT for LAN x 4