This part came with my 10 year old Lian Li case. I could never figure out what it was for. It installs in the back of the case. One of the connectors is SETA. I may find use for it in my next build.
#1, (jpg file)
I believe the other connector is Firewire.https://www.cablestogo.com/learning/connector-guides/firewire
Behind every good computer... is a jumble of wires 'n stuff.
Do you mean esata?