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Managed to put 6 RX 480 on a mobo using Corsair RM1000i 1000W. Running fine for an hour or so. Will update if my rig shuts down.

P/S: Did not test it with watt meter
Setting: Stock Memory, GPU & Power, 60~80 Temperature, 2000~4000 Fan Speed
Rig: Intel Celeron, 8GB RAM, 1TB HDD, MSI Z87-GD65

My undervolt 6x R9 390 draws 1030W from the wall and hash at 165 MH/s. I use the 1200W Corsair platinum.

How much undervolt may I ask?

with 4 x 290's Im getting 120 mh/s @ 800watts. You have two more cards

I undervolt it to 1000 mV. When it is running, the voltage will drop to around 984 mV. I also use the 93% efficient power supply. The frequency is about 970 MHz.

I'm running with a Superflower leadex 1200w platinum. The entire system mining Eth (not dual mode) is at 850watts. 2x290x + 2x290 @ 1060mhz 1.039v

With dual mining though, each card will consume ~60 watts more and 1200w is cutting it very close for 24/7.

Are you running with stilt roms? rops disabled?

I think there is no stilt bios for the 390. I have similar set up and you just need to undervolt a lot. The 390 is more efficient than 290. The 290x consumes more than 290.