I don't have one, but that's a good idea
Actually, I was just thinking about it and I may not have to do it (brain is working a little slow tonight, the beer

). The LAN was supposed to be at a friend's house this time, but he's not able to host it, so it's back to my place, which means I can use my main rig and the 4790 can sit in the corner all alone. But still, I need to figure out what's going on with it.
It's dual booting, and the grub would allow me to select OS as you say. However, I can't get anything form keyboard, no power, so I can't select Windows, and it loads Mint automatically.