You said you've already checked all cables, so maybe this isn't your issue.
Yea I’ve unplugged it for now and I’m rubbing 3 1080tis, when I get home I’ll replug everything in and try again. The thing is, it was working perfectly fine before I fiddled with it and I added the fourth gpu.
You mean that you're getting the error 43 on all of the cards once you add the fourth? Or you're just getting it on the fourth card?
I’m getting it on one card that isn’t the new card. So it was workin fine before I added the fourth. Which is mind blogging and it’s probably something really stupid.