I'm currently using PCI-E to 3 barrel connectors for all my power needs at the moment one word of caution and the reason for why I am replacing my cables; one of the pairs for the PCI-E to barrel connectors frayed every so slightly and caused a brief short. Not sure how it occurred but I've order screw connectors for all of my units and intend to replace all the power connectors (better safer than sorry).  I recommend giving your PCI-E connectors a once over to make sure none of the power (red) or ground (black) are frayed and if they are you should at the very least isolate the damaged cables with small stripe of electrical tape or re solder / re-shrink wrap the cable.