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Author Topic: [ANN] Spondoolies-Tech - carrier grade, data center ready mining rigs  (Read 1256181 times)
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Biodom
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January 20, 2015, 04:22:29 PM
 #10781

all 8 are now on auto waiting for them to settle a 6% fan

I have a situation where at fan 20 almost all are at 85C, but one is stubbornly at 100. since it goes by a single chip with the highest temp, i wonder what my fan setting would be. If close to where it started, then it is not even worth doing. Instead, i can just pick 10, then modify voltage until the "worst" chip is at 115. In any case, it is a very cool feature.
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January 20, 2015, 04:32:45 PM
 #10782

Thanks to the auto fan i was able to bump it up 0.64/0.65 settings and stay under the 20% fan it used to be. The heat is a bit more, but at least the noise in my office is WAY down with 3 of them with a bump in speed  Grin


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January 20, 2015, 05:25:54 PM
 #10783

Not everything goes smoothly with auto. On one machine, loop 3 gets temporarily disabled (upper image). cause? once i switched from auto to fan 10, everything is back to normal (lower image). on the second machine this did not happen, so maybe it is sporadic.


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January 20, 2015, 05:54:47 PM
 #10784

2.6.7 available in Spondoolies app-store for free 30 day trial Smiley

Does the fan RPM show in the output from cgminer now?

Can I set it/can it go below 20% now w/o a SSH hack?

Thanks.

M

You can see real fan speed in ASIC stats, it's a bit complicated to move it to front page - I will need to dump it to separate file from minergate and I am too lazy for that.
Yes, you can set it to 10% or to AUTO that can take it down even to 6% if no ASIC reaches 120C.

Regards`

Would you be able to put the fan speed in the API output please, ideally in both cgminer and /monitor.php?

Thanks.

M

I mine at Kano's Pool because it pays the best and is completely transparent!  Come join me!
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January 20, 2015, 08:33:20 PM
 #10785

If you want to replace fans-I finally opened one SP20 and I don't see how I can disconnect the stock fan from the board connector unless using some bend tweezers. the connector is upside down and not easily accessible.

put out the 4 screws from the controller board to unconnect the fan.
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January 20, 2015, 08:45:18 PM
Last edit: January 20, 2015, 09:15:28 PM by Biodom
 #10786

Two underclocked SP20 report 681+682 watts=1363 watts at the wall, but kill-a watt reports 1424-1425w for the same two (nothing else is connected to kill-a-watt).
SP20, i assume, should be able to measure precisely. Can kill-a-watt be so much off or Sp20 showing 'theoretical" at the wall assuming gold/platinum PSU, hence a difference because I use CX750M bronze?
EDIT: OP posted that it is basically "theoretical" at the wall, assuming 90% efficiency. Increase by at least 5% if you use Corsair CX750/CX750M bronze. In my case 2.6.7 shows ~680w "at wall" while it is actually ~712.5W.
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January 20, 2015, 08:46:42 PM
 #10787

Prices are great these days but I must say it's a bit sour that I could have basically not bought an SP30 at all back in august and bought it instead today, and I would have saved money overall. In other words the miner prices have fallen faster than the revenue.

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January 20, 2015, 08:57:20 PM
 #10788


- sum of PSU(unknown) input watts in addition to DC2DC watts, either on ASIC Stats page or main page, as for estimate of power at wall or PSU efficiency <- will implement in 2.6.7. For sp20 I assume 90% efficiency

I think you misunderstood me:
the low voltage DC2DC watts are way below (80%) the watts at the PCIE connector inputs in SP20. And the efficiency between the PCIE and the wall is determined by the PSU and should be around 90%.

You did not!!
my error!!!  Shocked Roll Eyes
I only saw new name DC-W which I confused with w=wall (which by the way makes no sense as it is AC at the wall).
you new entry "wall watts" matches my PSU and measuring very well!!  (y)!
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January 20, 2015, 11:41:51 PM
 #10789

What temperature should I aim for to prevent harming the SP20?
I am reaching 78C on Back T,B with 23C intake.
Also does anyone have a calculator or chart showing effeciency ?
Clocking it down to around 1050GH gets me around 0.51 watt per GH.


Datacenter Technician and Electrician.  If you have any questions feel free to ask me as I am generally bored looking at logs and happy to help during free time.
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January 21, 2015, 12:48:41 AM
 #10790

So besides noise & heat, does it really pay to underclock vs. stock on the SP20?  I tried to run the numbers allowing a total of 4200 watts at the units (not wall).  I used 700w for underclock at 1200gh/s and 1200w for 1600gh/s.  My calc shows about $697 higher price for 6 underclocked units vs. 4 stock units.  The underclocked higher hashrate would take over 600 days to return the higher price of underclocking.

Am I missing something?
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January 21, 2015, 12:50:09 AM
 #10791

What temperature should I aim for to prevent harming the SP20?
I am reaching 78C on Back T,B with 23C intake.
Also does anyone have a calculator or chart showing effeciency ?
Clocking it down to around 1050GH gets me around 0.51 watt per GH.



Take a look at your chip temps.  They are more important than the temp of the air leaving the machine.
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January 21, 2015, 12:50:54 AM
 #10792

So besides noise & heat, does it really pay to underclock vs. stock on the SP20?  I tried to run the numbers allowing a total of 4200 watts at the units (not wall).  I used 700w for underclock at 1200gh/s and 1200w for 1600gh/s.  My calc shows about $697 higher price for 6 underclocked units vs. 4 stock units.  The underclocked higher hashrate would take over 600 days to return the higher price of underclocking.

Am I missing something?

Depends on your electricity price.  At current BTC/USD value, I'm losing money running at stock.

M

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January 21, 2015, 12:55:09 AM
 #10793

So besides noise & heat, does it really pay to underclock vs. stock on the SP20?  I tried to run the numbers allowing a total of 4200 watts at the units (not wall).  I used 700w for underclock at 1200gh/s and 1200w for 1600gh/s.  My calc shows about $697 higher price for 6 underclocked units vs. 4 stock units.  The underclocked higher hashrate would take over 600 days to return the higher price of underclocking.

Am I missing something?

Depends on your electricity price.  At current BTC/USD value, I'm losing money running at stock.

M

That's why I used a fixed wattage so that the electric would be the same in the comparison. It's just additional hashrate at lower w/gh but higher $/gh.
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January 21, 2015, 01:33:18 AM
Last edit: January 21, 2015, 01:47:58 AM by Epoch
 #10794

So besides noise & heat, does it really pay to underclock vs. stock on the SP20?  I tried to run the numbers allowing a total of 4200 watts at the units (not wall).  I used 700w for underclock at 1200gh/s and 1200w for 1600gh/s.  My calc shows about $697 higher price for 6 underclocked units vs. 4 stock units.  The underclocked higher hashrate would take over 600 days to return the higher price of underclocking.

Am I missing something?
Depends on your electricity price.  At current BTC/USD value, I'm losing money running at stock.
That's why I used a fixed wattage so that the electric would be the same in the comparison. It's just additional hashrate at lower w/gh but higher $/gh.
You are not missing anything. mdude77 is correct in that it depends on your local electricity price. But it also depends on whether you are planning to buy units or already have them.

If you already have the units, then your goal might be to maximize net income. See https://bitcointalk.org/index.php?topic=521520.msg10146041#msg10146041 for an example. The higher your electricity rate, the more it makes sense to underclock existing units. Your net hashrate will decrease due to the underclock, but your electricity usage will decrease even more with the result that your net profit (income minus expense) actually increases.

In your example you have used a fixed power budget (4200W) and have taken into account the purchase of either 6 underclocked versus 4 stock units. That is a different calculation and, in this case, you are correct in that buying 6 units only to underclock them may not make sense in terms of return on investment. i.e. buying 4 units and running them at stock speeds may recover your initial investment cost sooner than buying 6. But even here it depends on your electricity costs; if your costs are high enough it is possible that stock units will run at a loss (i.e. you will never recover the purchase price), while underclocked units will run at a profit ... meaning that buying 6 underclocked units make more sense than buying 4 stock units.

Or, as the artificial intelligence WOPR concludes in the the 1983 movie WarGames, sometimes "the only winning move is not to play."
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January 21, 2015, 02:23:59 AM
 #10795

What temperature should I aim for to prevent harming the SP20?
I am reaching 78C on Back T,B with 23C intake.
Also does anyone have a calculator or chart showing effeciency ?
Clocking it down to around 1050GH gets me around 0.51 watt per GH.



Take a look at your chip temps.  They are more important than the temp of the air leaving the machine.
70-100c only 1 was 100c

Datacenter Technician and Electrician.  If you have any questions feel free to ask me as I am generally bored looking at logs and happy to help during free time.
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January 21, 2015, 03:15:51 AM
 #10796

Or, as the artificial intelligence WOPR concludes in the the 1983 movie WarGames, sometimes "the only winning move is not to play."

Okay, that I understand Smiley

So I was just using an arbitrary $.10/kwh rate.  You are saying there may be a sweet spot where rates are high enough that it would make more sense to run underclocked rather than stock.  I'd have to see hard numbers to get it when trying to compare apples to apples.  For the additional capital outlay, I don't see the underclocking making up the difference in a reasonable time.  Since in my example I'm going to pay the same amount for electricity whether I'm using underclocked units or stock units I'm having a hard time seeing the underclock advantage for best dollars spent.
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January 21, 2015, 03:17:23 AM
 #10797

What temperature should I aim for to prevent harming the SP20?
I am reaching 78C on Back T,B with 23C intake.
Also does anyone have a calculator or chart showing effeciency ?
Clocking it down to around 1050GH gets me around 0.51 watt per GH.



Take a look at your chip temps.  They are more important than the temp of the air leaving the machine.
70-100c only 1 was 100c


Those are good solid numbers. >115 it starts alerting and I think at 125 it adjusts the chip <?>.
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January 21, 2015, 03:44:27 AM
 #10798

Or, as the artificial intelligence WOPR concludes in the the 1983 movie WarGames, sometimes "the only winning move is not to play."

Okay, that I understand Smiley

So I was just using an arbitrary $.10/kwh rate.  You are saying there may be a sweet spot where rates are high enough that it would make more sense to run underclocked rather than stock.  I'd have to see hard numbers to get it when trying to compare apples to apples.  For the additional capital outlay, I don't see the underclocking making up the difference in a reasonable time.  Since in my example I'm going to pay the same amount for electricity whether I'm using underclocked units or stock units I'm having a hard time seeing the underclock advantage for best dollars spent.


This is what helped me make up my mind on where to set my miners settings at.

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January 21, 2015, 04:05:10 AM
 #10799

Or, as the artificial intelligence WOPR concludes in the the 1983 movie WarGames, sometimes "the only winning move is not to play."

Okay, that I understand Smiley

So I was just using an arbitrary $.10/kwh rate.  You are saying there may be a sweet spot where rates are high enough that it would make more sense to run underclocked rather than stock.  I'd have to see hard numbers to get it when trying to compare apples to apples.  For the additional capital outlay, I don't see the underclocking making up the difference in a reasonable time.  Since in my example I'm going to pay the same amount for electricity whether I'm using underclocked units or stock units I'm having a hard time seeing the underclock advantage for best dollars spent.


This is what helped me make up my mind on where to set my miners settings at.


Got it now. Thanks.  At current price of btc, the extra 400gh/s return is higher than the additional wattage used for me.
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January 21, 2015, 04:05:20 AM
 #10800

Or, as the artificial intelligence WOPR concludes in the the 1983 movie WarGames, sometimes "the only winning move is not to play."

Okay, that I understand Smiley

So I was just using an arbitrary $.10/kwh rate.  You are saying there may be a sweet spot where rates are high enough that it would make more sense to run underclocked rather than stock.  I'd have to see hard numbers to get it when trying to compare apples to apples.  For the additional capital outlay, I don't see the underclocking making up the difference in a reasonable time.  Since in my example I'm going to pay the same amount for electricity whether I'm using underclocked units or stock units I'm having a hard time seeing the underclock advantage for best dollars spent.
It is good that you are going through the mental exercise. Consider this scenario using an SP30 as an example (SP20 values will of course be different, but the concept is the same) at various underclock settings:

BTC exchange: $220USD/BTC
electricity charge: $0.10/kWh
difficulty: 44 billion
4400GH/s; 3000W; $332.14/month gross; $216.00/month electricity cost; $116.14/month profit
4000GH/s; 2320W; $301.94/month gross; $167.04/month electricity cost; $134.90/month profit
3350GH/s; 1760W; $252.88/month gross; $126.72/month electricity cost; $126.16/month profit
2870GH/s; 1392W; $216.64/month gross; $100.22/month electricity cost; $116.42/month profit
2590GH/s; 1232W; $195.51/month gross; $88.70/month electricity cost; $106.80/month profit

So if you happen to have an SP30 and you are being charged $0.10/kWh, it should be clear that you are best off underclocking it to around 4000GH/s. Your monthly electricity charge will be $167.04 on an income of $301.94, netting you a monthly profit of $134.90 per month. That's about the best you can do under those conditions with an SP30.

Let's say you buy 4 SP30's and run them at stock. That is, 4400GH/s using 3000W each (12000W). You can expect each one to net you $116.14 monthly; so for all 4 you will earn $464.56 per month. 4 SP30's will cost you roughly 4x $2000 or $8000. So (assuming BTC value stays the same and difficulty remains the same) it will take you $8000/$464.56 or 17.2 months to recover your investment. Not particularly good.

Now let's say you buy 5 SP30's and underclock them to 4000GH using 2320W each (11600W ... very close to the 12000W above). You can expect each one to net you $134.90 monthly; so for all 5 you will earn $674.50 per month. Now, 5 SP30's will cost you 5x $2000 or $10000. So it will take you $10000/$674.50 or 14.8 months to recover your investment. This is better than what the 4 stock SP30's can do.

So for this example, with the assumptions and costs as above, 5 underclocked SP30's will recover their $10,000 cost sooner than 4 stock SP30's can recover their $8000 cost. In other words: you are better off underclocking in this scenario. I haven't run the numbers for an SP20; I'll leave that to you. But it seems you've already run the analysis.

Most folks will have an electricity rate higher than $0.10/kWh so their net monthly profits will be lower, their recovery time will be longer, and the "sweet spot" will be an even more aggressive underclock.

I see that DiCE1904 has provided a handy table of SP20 values. Smiley
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