Re: 1.4kW???
A lot of people over-egg PSU capacities a bit. My home machine is a Ryzen 7, GeForce 1070Ti and has an SSD plus 5 mechanical hard drives in it. When it is sitting here now running a web browser and a few other bits, it struggles to pull over 200 watts. Even with the graphics card running full tilt in a game I've never seen it go over 500w.
Saying that, I do have an 850w PSU in it...