Not sure if its the same thing, but I started getting the 2D crash with blue squares again within 5 minutes of loading up windows. I just swapped my cards around and it went away.

No more 2D crashes since swapping them around, this worked before as well, but I must have forgotten and swapped them to the faulty order while tinkering at some point.

What do people think could be causing this then? I didnt reinstall the drivers after swapping them, and doing so wouldnt work in the dodgy order.
Both cards have no problems in 3D and are fully stable at 1000 / 1445. But when installed in one order, they get 2D blue square lockups, when installed in the other order they have no problem.

They are wierd indeed.