Maybe the Corsair AX 1500i would be a good choice. It seems to beat even the Cooler Master flagship in the efficiency dept. I'm assuming (and I know I shouldn't) that your aiming for ~ six to eight hundred watts of normal load.
I think there's something to be said for over-spec'ing a power supply these days too, assuming you care about efficiency. Most advancements in PC hardware lately has been focused on efficiency. Things today use far less power than things of yesterday while still offering better performance.
If you're running a 1500W PSU, a high-end PC at idle these days is in the realm of 100-150W. That's only using 1% load, which is not going to run at 80+ standards. The only reason I see the need for a 1000W+ PSU would be if you're running dual CPU's with SLI/Crossfire.
With my PC (6850k, 1080 Ti) and my monitor (U3415w), I'm using 170W at my UPS as I type this post. Even while gaming, I don't pass 500W.
Yes, it is a very good choice to spec the system's PSU with the load in mind. Nowadays hardware, even the high end parts are very conscious on power draw, not that it would really count for a gamer, that is more from datacenter/enterprise pov, but to be to the object, the PSU runs at it's best efficiency while at 50% of it's load.
If not enough power for you then I would look towards the evga 1200W P2 or hell, the 1600W T2. If you don't want Evga then you could also look at the excellent Seasonic Prime ones, like the 1200W Platinum one. It got a 9.6 from JonnyGuru Seasonic Prime Platinum 1200W Review
Edit: I should add that with my system, 4770K@4.6GHz with SLI 1080ti FEs, and a few drives shows peaks of about 830W on my UPS.
The AX 1500i got a 10 from JonnyGuru. It is likely the most efficient unit out there right now and that may be important for BrainEater's application. Even HardOCP said it was the most efficient they had tested as of review date.
If you are folding on that thing, efficiency and heat gotta be prime concern obviously. I don't know about the latest high-end parts (too poor these days to try to keep up) but try to stick to 50% load and efficiency at that level.
Corsair has always been good to me when I have asked for support in the past.
My current rig is a 3930k with 3 1070's , The whole thing folds constantly , Last time I checked it was about 700-750w at the wall.
I'm looking at a fully ready 4k video editing rig : Skylake-x ( 10 core ?!!) ((200W)) and 3 ptitans, or even volta's mebbie , gonna take a while to build and pay for this.
....And again it will fold 24/7.
That looks like 850 Watts nominal at least to me.
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