I really do hope it wasnt my fittings that caused this!
Nope. The loop over heated, and exploded from pressure because the EK crap wasn't doing its job.
Sure a soft fitting may have held out longer, but that pressure has to go somewhere. The GPU WB would have leaked.
I pressure tested loads of stuff quite brutally once. I found that the GPU block would leak the fastest, because of the large O ring.
They're made to hold about 0.3 bar, IIRC. Anything over that? they are designed to let the pressure out.
I've seen a lot of hard line fittings blow out because of pressure. That was why I avoided it in the first place, but then soon realised you really do need to monitor the coolant temp. Obviously you can't monitor the internal pressure, but air will expand like a biyatch when its hot. And there's practically no way of getting rid of that.
All you can do is fit a valve like I have, somewhere where there is no hardware. So if she blows? at least it won't be all over your electronics. What I do find odd, however, is that the coolant caused a short. It absolutely shouldn't have, at all.
I've literally doused my components by accident before whilst they were on and have never seen any damage. Ever. It shouldn't be conductive, especially when it was that fresh.
But yeah, THE most important temp in a water cooled rig is the coolant temp. Once it goes over a certain temp it will expand like you wouldn't believe.