I spoke too early. I end up with same kind of issue with a full scale brand new psu: Playing on a game or changing display settings shuts down egpu's psu in what i assume is security mode 'cause i can't relaunched it like this. Before doing that the damn things worked for 25 minutes under gpu test: Here are pics from the setup: So i end up with same issue as with dell da2. Good thing is my da2 may be good and i may end up using it. But what can cause this kind of iss