Since I can't post in any support forums yet, I might as well ask a question here.

Does anyone know if using Y-Adapters for powering PCI-Express video cards is a bad thing?

I have a 1200W power supply and two HD 7590 video cards.  The power supply only seems to have 2x 6 pin connectors, and the cards require 2 each.  I have Y adapters so that I can run both cards.  Everything runs fine until I try to start mining.  At this point the computer crashes pretty much instantly.

I'm assuming this is a power consumption issue since there are no relevant events logged by the windows event viewer.  But since I have a 1200W power supply (Dell T7600) it seems unlikely that I've run out of power.... which brings me to the Y-adapters.

Thoughts?