Good Find! That may well be the problem if I'm reading that right. I'm going to mod (
https://bitcointalk.org/index.php?topic=76121.0) a spare 16->1x riser to have molex over the next few days (hopefully tomorrow) and will retest the system for stability and report back.
In the mean time... Anyone want to chime in on what manufacturers/vendors you like to use?
I think Cablesaurus is the only molex-modded seller. I'd look into how to make my own but with BTC (and LTC