Am I seeing things or do you have the GPU plugged into the HDD molex connectors using an adapter?
That's bad mojo if you did. Your PSU should have proper cables.
An 8-pin and a 6-pin adapter came with the GPU and I used them both. Is that wrong? The 6-pin one splits into two molex conncetions. If I recall correctly, the cables that came with the PSU weren't long enough when having them come from the back so I used the 8-pin adapter for that.