I got 1 cube as well from Canada .
This is bad product.
Clicking from time to time.
Random resets, with clicking constantly noise, and second red light blinking.
Everything was fine in the first 2 weeks, now even on low clock i got issues from time to time (hour to hour).
my powersupply is fine 850 modular,good brand.
What is the max wattage or amperage per 12v lead on that PSU?
Are you using two PCI-E leads or molex to PCI-E adapters?
Have you done the standard troubleshooting steps?
Is the silver label still on the front of the system fan?