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Author Topic: Question about powering an ASIC - Please help!  (Read 589 times)
BennyAndDeJets
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June 18, 2017, 04:20:43 PM
 #1

Hi,

I just have one quick question: Can two 850w Seasonic 80+ Gold power supplies power one antminer s7?  Each PSU has 6x6+2 PCIe power cables.

Thanks
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HagssFIN
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June 18, 2017, 04:26:16 PM
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No.

4.73 Th/s model has a power consumption of about 1300W.

You can't mix two PSU's in the same hash board, they start to "fight" each other, because of the voltage level differences between two PSU circuits.

Here are some rough power consumption numbers
One board: 433W
Two boards: 866W
All three boards: 1300W

As you can see, two board would consume too much for your PSU, and as I said, you can't power the same hash board with two different PSUs.

BennyAndDeJets
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June 18, 2017, 04:36:43 PM
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No.

4.73 Th/s model has a power consumption of about 1300W.

You can't mix two PSU's in the same hash board, they start to "fight" each other, because of the voltage level differences between two PSU circuits.

Here are some rough power consumption numbers
One board: 433W
Two boards: 866W
All three boards: 1300W

As you can see, two board would consume too much for your PSU, and as I said, you can't power the same hash board with two different PSUs.

I was planning one powering two boards with one PSU and the third board and controller with the other PSU.  Thoughts?  I also have a 1000w PSU that I can transfer from a separate computer, but that leaves the question of whether or not a 850w can power three GPUs effectively, can it?  Sorry for the bother.
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June 18, 2017, 04:39:23 PM
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850W Seasonic won't be enough for two S7 hash boards. Period.

I don't know exact specs of your 1000W PSU, but your 1000W PSU for two boards and 850W PSU for one board and the controller is a feasible idea.

Remember that the PSU powering the controller should be the last one to be turned on.

BennyAndDeJets
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June 18, 2017, 04:42:59 PM
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850W Seasonic won't be enough for two S7 hash boards. Period.

I don't know exact specs of your 1000W PSU, but your 1000W PSU for two boards and 850W PSU for one board is a feasible idea.

Remember that the PSU powering the controller should be the last one to be turned on.

It is a 1000w Seasonic 80+ Gold with 6x6+2 PCIe cables (at least that many I can't remember the exact amount atm), so that should work?  Will a 850w be enough for three RX 470s?  If not, I guess I'll return one 850w and pick up another 1000w once I make something.
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June 18, 2017, 04:48:16 PM
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850W Seasonic won't be enough for two S7 hash boards. Period.

I don't know exact specs of your 1000W PSU, but your 1000W PSU for two boards and 850W PSU for one board is a feasible idea.

Remember that the PSU powering the controller should be the last one to be turned on.

It is a 1000w Seasonic 80+ Gold with 6x6+2 PCIe cables (at least that many I can't remember the exact amount atm), so that should work?  Will a 850w be enough for three RX 470s?  If not, I guess I'll return one 850w and pick up another 1000w once I make something.
Okay, yes nice. Seasonic is a good one.

According to Tomshardware.com 1x RX 470 has a power consumption of about 144W with maximum load.
http://www.tomshardware.com/reviews/amd-radeon-rx-470,4703-6.html

So I'm guessing your PC should be fine with the 850W Seasonic.

BennyAndDeJets
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June 18, 2017, 04:51:50 PM
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850W Seasonic won't be enough for two S7 hash boards. Period.

I don't know exact specs of your 1000W PSU, but your 1000W PSU for two boards and 850W PSU for one board is a feasible idea.

Remember that the PSU powering the controller should be the last one to be turned on.

It is a 1000w Seasonic 80+ Gold with 6x6+2 PCIe cables (at least that many I can't remember the exact amount atm), so that should work?  Will a 850w be enough for three RX 470s?  If not, I guess I'll return one 850w and pick up another 1000w once I make something.
Okay, yes nice. Seasonic is a good one.

According to Tomshardware.com 1x RX 470 has a power consumption of about 144W with maximum load.
http://www.tomshardware.com/reviews/amd-radeon-rx-470,4703-6.html

So I'm guessing your PC should be fine with the 850W Seasonic.

Awesome, thank you so much for the help!
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June 19, 2017, 03:08:30 AM
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Depending how it's clocked (more specifically, what version of miner) it should be possible. I've had several in hosting that have been running off a pair of Dell 750W server PSUs, two boards to one supply and one board + controller to the other, for about a year with no issues except on the hottest days. Won't handle some of the new very-hungry S9/T9 but did stock S7s.

It's also not too difficult, if you have the right tools, to undervolt an S7 for greatly improved efficiency. Low enough to run off a single 1000W PSU and still get around 4TH.

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June 19, 2017, 08:29:51 AM
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Also keep in mind that the S7 "power requirement" spec is "at the wall" using a 93% efficient PS - so the actual draw would be a little less.

 However, trying to power 2 hashboards from an 850 would be very marginal at best.

 2 hashboard on that Seasonic 1000 and the third + miner control board + fans on one of the 850 however should work fine.


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HagssFIN
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June 19, 2017, 01:16:59 PM
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Also keep in mind that the S7 "power requirement" spec is "at the wall" using a 93% efficient PS - so the actual draw would be a little less.

However, trying to power 2 hashboards from an 850 would be very marginal at best.

2 hashboard on that Seasonic 1000 and the third + miner control board + fans on one of the 850 however should work fine.
This is correct and the same as my proposition.

Depending how it's clocked (more specifically, what version of miner) it should be possible. I've had several in hosting that have been running off a pair of Dell 750W server PSUs, two boards to one supply and one board + controller to the other, for about a year with no issues except on the hottest days. Won't handle some of the new very-hungry S9/T9 but did stock S7s.

It's also not too difficult, if you have the right tools, to undervolt an S7 for greatly improved efficiency. Low enough to run off a single 1000W PSU and still get around 4TH.
This is good point, I used to have great time with underclocked  S7 and Enermax Revolution 87+ 1000W PSU.

Sidehack is the magic man when it comes to mining hardware and he has a topic for this "underclocked S7" subject: https://bitcointalk.org/index.php?topic=1504228.0

BennyAndDeJets
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June 19, 2017, 03:14:56 PM
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Also keep in mind that the S7 "power requirement" spec is "at the wall" using a 93% efficient PS - so the actual draw would be a little less.

However, trying to power 2 hashboards from an 850 would be very marginal at best.

2 hashboard on that Seasonic 1000 and the third + miner control board + fans on one of the 850 however should work fine.
This is correct and the same as my proposition.

Depending how it's clocked (more specifically, what version of miner) it should be possible. I've had several in hosting that have been running off a pair of Dell 750W server PSUs, two boards to one supply and one board + controller to the other, for about a year with no issues except on the hottest days. Won't handle some of the new very-hungry S9/T9 but did stock S7s.

It's also not too difficult, if you have the right tools, to undervolt an S7 for greatly improved efficiency. Low enough to run off a single 1000W PSU and still get around 4TH.
This is good point, I used to have great time with underclocked  S7 and Enermax Revolution 87+ 1000W PSU.

Sidehack is the magic man when it comes to mining hardware and he has a topic for this "underclocked S7" subject: https://bitcointalk.org/index.php?topic=1504228.0

Thanks for the great advice - I'm gonna check out that topic and will likely bookmark it  Cheesy
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