Possibly a brief undervolt condition that's not enough to trip the power supply but enough to keep VRMs from firing up properly and the chips error out because they're taking slightly too long to initialize. The 380 probably isn't nearly as busy inside as the big guys (likely active PFC and a bunch of other mess) so it might have better output capacitors since there's likely more room for them. I'd try the capacitors-wedged-in-the-6pin trick and see if that helps smooth things out.
Otherwise, really no idea why it might work on a low-end PSU but not a big sexy one.
Yeah it's a funny one. The capacitors did fix my other issue with the Cubes tripping the Seasonic's breaker, but it only seems to work with one Cube at a time, i could not get it to work with two cubes attached. I am going to RMA it. Not worth the hassle.
I did try the trick with the capicator on this particular cube, but it still has the xxxxxxxxx's. I will try it with the thermaltake, next time it crashed and reverts to xxxxxxxx's (it working now and I dont want to take it offline)
Thanks for all your help with the Seasonic. It was very educational!
Hi babaji.ca, do you have a photo or diagram to show how to put in a capacitor for Seasonic X750 PSU ? I had the same issues with the cube tripping the my PSU when I power on.
TIA.