Could you very well be a buggy card. Before we reach to a conclusion, try updating the drivers to 9.11 and see if it still keeps coming. I have no idea about Cougar PSU's. Its not available in my country, so cant comment on that. But these things happen coz of bad PSU's.
1. Check if your power connectors are properly fitted in the card and the card in the PCI slot.
2. Update the drivers.
Try these and see if you still get the error.