3080Ti Hydro Cooling Build

So for some background, I've been on a 980Ti since it came out and I'm starting to see artifacts. I stepped its clocks down a little, but it's just not providing the compute power I need.

I found a 3080Ti on EVGA's website after a few beers thanks to a Discord bot, and snagged one of them along with a new power supply- only to reread the listing and realize it was a hydro card- meaning no air cooling. Just water.

Meaning a custom loop.

It's not a major deal since I wanted to do this eventually anyway, I just kinda got thrown down the rabbithole by my own impulsivity and my brain being fried from work. But my case is an 800D I got off the Fry's floor in 2014 for a song. It's not exactly compatible with "modern" water cooling- but if I could figure out how to jam a full loop in there without destroying my bank account further that'd be fantastic.

TL;DR brain fried after work, bought a card, realized it's a water-only card, I don't have anything set up for water yet, help

Current spec is an MSI Gaming Edge Wifi X570, Ryzen 3700x, 16x2gb of RAM, 980Ti, currently have a Corsair 850W but I can't find its auxilary cable kit in case I need those. Two 3.5" HDDs, 1x 2.5" SSD, and an M.2 onboard.