When I first put my system together, I started having issues with my system randomly freezing.  There was no warning....no indication of what I was doing.  I could be in a graphically intensive game, or just watching Youtube.  Often times, when the system froze, it would remain that way, and would force me to do a hard shutdown.  Sometimes, the system would reboot on its own.  And often times, when the system would come back on, the keyboard wouldn't work.  I would have to unplug the keyboard from the back and plug it back in, then it would work.
 
I tried several things [with the help of several on this board], tested with different memory sticks, and even RMA'ed the motherboard [which seemed like it was the cause of all of this].  New board did the same thing.
 
The people helping did an amazing job trying to help me figure it out......but I had left out what ended up being a very critical piece of evidence that I had no idea WAS critical.  I was using a vertical GPU mount.  I began to wonder if it were the issue, so I removed it and put the GPU straight into the motherboard.  I've not had an issue since.
 
I cannot believe the issues I had before were caused by a vertical GPU mount,....and more specifically the cabling used with it.  However, I do like the idea of a vertical mount and was wanting to know, if I chose to use one again, which cable would actually work with the system I have?  

Thanks for the suggestion.  I'll keep that one in mind.  
 
I'd like to see a variety of options.  Thanks guys!

It’s also good to see if the motherboard company offerers a vertical mount cable. A good brand name case built for vertical mounting is the best way to do it I feel.

As a side note,....has there been anyone testing to see if there is any temperature change between a vertical mount and one straight into the motherboard?  I wonder...because one whole side of my GPU if up against the motherboard.

I don't really have much problem with temps for my GPU.  If I'm running highest graphics settings, I can see 74c at the highest.  Just wondering, really.  I'm fine keeping it plugged straight into the board.
 
Also, my case has a lot of airflow.  I have 6 fans bringing air in from the bottom and side, and 4 fans evacuating the air [3 at the top, 1 in the back].