Quote from: IOTUSA on January 17, 2017, 10:02:29 PM

Quote from: GH on January 17, 2017, 09:51:47 PM

Quote from: IOTUSA on January 17, 2017, 09:34:19 PM

Quote from: GH on January 17, 2017, 09:32:42 PM

Quote from: IOTUSA on January 17, 2017, 09:19:27 PM

Quote from: GH on January 17, 2017, 09:16:09 PM

Quote from: IOTUSA on January 17, 2017, 09:09:24 PM

Can someone tell me the Max power draw for a stock Rx 480 4GB? Trying to figure out a PSU for a 6 x 480 rig.

Use nominal values from datasheet for this purpose (=150 W) and add proper headroom for overclock, spikes and working point at good efficiency.

So a gold rated 1200W PSU for 6 x 480 + MB with Celeron-CPU and risers/SATA should be just fine in other words. Even without undervolting.

Would be too close for me. To max out the cards under all conditions my bet would be more at 1600W. You do not want to run the PSUs the whole time at nearly full load, even if it might work for a surprisingly long time with high quality models.
But that's one of the reasons I don't build rigs with more than 4 GPUs. It's much better to handle while having a greater and cheaper selection of components.

1600w? Their max TDP is like 160w, how can I get to 1600w with 6x?

It will not consume 1600W, but it would be a good choice for the PSU size:
Load working point of the PSU. Sweet spot of a gold rated one is around 50% load. So if you run it between 50 and say 75% you will have nearly highest efficiency, stability, reserves, lifetime and no thermal problems. From the technical view this would be the right way.
But if you like you can also use a 1000W PSU for a 1000W load. Should work on the paper. Maybe. For a more or less long period of time. As I said, I already tested a lot and I will avoid such combinations in the future.
And don't forget it's 24x7 load.

50% load sweet spot? That can't be even remotely true. I agree that having some headroom is good but running 1600w for 800w load is just not a thing.

Why can't that be true? Because you've never heard of it? 50% - 70% is usually the best efficiency for a PSU. Depends on the PSU and curve. 85% or less is recommended for a longer life-cycle. I always aim for ~50% load on PSU understanding that demand usually increases.

http://www.anandtech.com/show/2624/3

Edit: And I currently have an 800W load on a 1600W PSU. So I guess it is a thing.