Quote Originally Posted by Christopher View Post
Yes, but the Seasonic X series uses DC to DC for the 3.3 and 5v rails.

Yes, EIST/Speedstep and Turbo are now enabled... but performance power mode is too. With all the power saving functions off, it was just sitting at the max non turbo ratio as it should.
I personally trust a PSU only if it passes the oscilloscope test. I had a bad experience with a "good" PSU in the past. Also, to check if the issues are related to power saving features/ power lines, could you keep one or more cores from your CPU busy with a CPU torture program like Prime95 or any other one while running the endurance test? This should keep the power consumption relatively stable and allow for a much better regulation.