Fatal Exception

I am the chap he brought it to. Hi Mike!!! It's a 4+4 connector, however I have not seen a connector such as this with additional keys, The PSU end of the cable has the correct keys but the motherboard end has more chamfered than I would normally see. The cable is the correct way round as the cable retention clip can only be secured one way. I wasn't sure if this was a corsair quirk and was a little suspicious of the cable as this was accompanied with a component failure on initial start up. I have identified two possible causes. The motherboard component failure was under one the heat spreaders and could have been caused by a damaged MOSFET (either bad anyway or crushed through overtightening at the factory) or PSU issue but I didn't bother too much with that. Probably nothing and I doubt anyone would have ever noticed if not for the smoke. Do corsair normally make them like this or should I get my multi meter out before we drop another board in?