Adding more RX580 to an existing rig

[deforester]

Got 6 RX580 on an ASRock H110 with an EVGA 1600W PSU running Linux (Ubuntu).

ETH: GPU0 30.033 Mh/s, GPU1 30.013 Mh/s, GPU2 30.032 Mh/s, GPU3 30.021 Mh/s, GPU4 30.089 Mh/s, GPU5 28.977 Mh/s
DCR: GPU0 902.676 Mh/s, GPU1 901.033 Mh/s, GPU2 868.399 Mh/s, GPU3 901.136 Mh/s, GPU4 901.056 Mh/s, GPU5 871.006 Mh/s
GPU0 t=70C fan=47%, GPU1 t=70C fan=40%, GPU2 t=66C fan=60%, GPU3 t=67C fan=60%, GPU4 t=65C fan=60%, GPU5 t=70C fan=31%

910 W at the wall solo mining ETH.
1210 W at the wall dual mining ETH+DCR

GPU0-4 = PowerColor Radeon RX 580 8GB Red Devil Golden Sample
GPU5 = Sapphire Nitro+ RX580 8GB

No under voltage or stuff like that. Just updated the bios.

So, I want to add another 6 RX580 and I'm not sure how to calculate for the second PSU.

How much does the motherboard use?
Can I add 1-2 more cards on the first PSU and then the rest on the second PSU?

[Vann]

The motherboard will use about 60 W. I have a 13 RX 580 dual mining rig on the ASRock H110 Pro BTC+ with a triple ATX PSU setup. You need to get a power meter so you can find out exactly how much power is being pulled from the wall. For maximum efficiency and longevity of your PSU, you don't want to run at more than 80% of the rated capacity. I have all three PSU's joined with a triple ATX cable so they come on and off together when the main PSU on the motherboard turns on/off. You also need to make sure you have enough PCI-E connectors for all the VGA power connectors and risers.

https://www.aliexpress.com/item/24-Pin-Power-Supply-Synchronizer-Extension-Cable-20-4Pin-Triple-PSU-ATX-Power-Supply-Adapter-Cable/32845655579.html?

Total system wattage: 2239 W

EVGA 1600 W T2:

13x risers + Motherboard
4 x Sapphire Nitro+ SE RX 580

1193 - 1198 W

-----

EVGA 1200 P2 VGA Only:

4 x Sapphire Nitro+ RX 580
1 x Asus RX 480

542 - 543 W

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EVGA 1000 P2 VGA Only:

1 x Asus RX 580
1 x Asus RX 480
1 x MSI Gaming X RX 580
1 x Sapphire Nitro+ RX 580

496 - 498 W

[Amstellodamois]

How much does the motherboard use?

Looks to me as if you need one measurement and a subtraction.
I'd say you just have to get a reading from your killawatt with 3 cards out of the 6. Subtract that value from 1210 W to get XXX. Then your total power consumption with 6 more cards, dual mining and your BIOS will be 1210 W + 2*XXX.

But do flash your new cards with your own BIOS before you plug them all.

[deforester]

Awesome! Thanks for the info guys

Then the 1600W is almost at its limit now with ~70W until it gets to 80%.

If the mobo uses about 60W, then I'm looking at about 190W per card including risers. 190 * 6 = 1140

80% on a 1300W is 1040W (1600's are almost impossible to get ahold of).

Could probably move a few risers over to the 1600W and then both would be pretty much at 80-81%.

[0xcosmos]

if you havent undervolt
i will suggest you do
dual mining power consumption can be reduced to 900w if properly undervolted

[crypto_raja]

Hi Mate,
Just curious to know which Ubuntu version you are running with rx 580. I was not able to run ubuntu 16 LTS  with sapphire Rx 580. Open CL not support. I tried in september 2017. I always wanted to run ubuntu in mining but unsuccessful. Please help.It's important. 
Thanks and please reply.