So just to be clear the only thing the rig needs to communicate with the computer is a lan cable? When I first installed the Gpu into the computer the display wasn’t showing up so I bought an hdmi to dvi conversion cable and that fixed the problem. Would I need to hook up one of the gpus from the rig to the old desktop or are those just for the monitor?

Yes I’m trying to have everything set up to one monitor I have a computer I’m using to mine right now but I wasn’t sure how to pair the rig up to the other computer. Would it just be an Ethernet cable or some other kind of hdmi connection? Also do I need to buy Microsoft 10 for the rig or could I just clone my os over onto the ssd drive. I plan on using 6gpus and the rig hasn’t been built yet I’m just asking out of speculation.

I'm new to the building process in general, but I'm trying to learn as much as I can before I invest money into building a rig. I already parted out an existing computer I had sitting around and gave it a new GPU card and added another stick of ram. My original plan was to use it for video editing but while its not in use Ive been running it on nicehash and earning roughly $1.50 a day just on one GPU. The main concern im having isnt so much building the rig because ive watched alot of videos on the subject but how would I go about connecting the new rig to the computer/ monitor that i already have sitting around. Any insight would be greatly appreciated