It doesn't matter if a PSU is new, it can still be faulty. If PSU wattage was a problem the PC would turn off when launching the game (aka powering the 3D) , not 5 minutes after.
From what you describe i would bet on the PSU or overheating.
Check your heat/voltages on CPU and video and report back.
Edit: new GPU might trigger higher util of your CPU and that leads to higher temps.
Edit2: finger check your heatsinks (like put your fingers on them). Sometimes the reported temps can be non-accurate.
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Sounds like overheating, CPU or GPU, trying running ED in much lower settings see if its any more stable.
Windows 10 also does some funny things with computer power managment, You might want to consider looking at your power options and switching it to "high preformance" mode and making sure any auto power throttling is turned off.