[ANN] Spondoolies-Tech - carrier grade, data center ready mining rigs

[tvasbn]

Philipma...am I right in reading that your efficiency is 0.39???

no that is another miner running at lower clocks in a colder area.


for the most part my sp20's do 460 to 490 watts and  1025 to 1075 gh.

So I am just under .48 at the kwatt meter.

 this one is using 460 watts   or 460/1015 = .448 watts a  gh at the kwatt meter

this one is in a spare bedroom the others are all in my attached  garage since I have 7 in their it is warmer and they do a little worse around .48

i also think that your intake temp is too high, it should be bellow 25 degree

[philipma1957]

Philipma...am I right in reading that your efficiency is 0.39???

no that is another miner running at lower clocks in a colder area.


for the most part my sp20's do 460 to 490 watts and  1025 to 1075 gh.

So I am just under .48 at the kwatt meter.

 this one is using 460 watts   or 460/1015 = .448 watts a  gh at the kwatt meter

this one is in a spare bedroom the others are all in my attached  garage since I have 7 in their it is warmer and they do a little worse around .48

i also think that your intake temp is too high, it should be bellow 25 degree

that would be nice but is not going to happen. 25 c = 77 f  when I run multiple sp20e's in the attached garage  the room is 30 c or  about 86 f

[ElGabo]

This thread turned the: how to downclock the SP20....  

I'd like to push them to as much ghs as I can....

Any ideas to improve cooling?

What I see the stock heatsinks are too small to keep the asics cool for countinous 1700ghs.

I was able to reach it for a while but I needed 15-16 C intake.

The average what I can get is 1590-1660 ghs stable, but with 120C asics at the back of the machine.

Are here anybody who not downclocked them and tried something out?

 

Edit: my fans on 100% and i don't care the noise. 

[mavericklm]

put it somewhere with access to cold outside air: balcony, garage, on the window...
disassemble it and put fans on each board!
as soon as i will get my sp20, i will try some overclocking

[ElGabo]

disassemble it and put fans on each board!
as soon as i will get my sp20, i will try some overclocking

No room for it..... 

I will cool them with ice or something....

Tried push pull with an about 240cfm fan on the front, I got 4 C better front temp but it's not a high improvement...

The asics on the back  are still hot...

[philipma1957]

This thread turned the: how to downclock the SP20....  

I'd like to push them to as much ghs as I can....

Any ideas to improve cooling?

What I see the stock heatsinks are too small to keep the asics cool for countinous 1700ghs.

I was able to reach it for a while but I needed 15-16 C intake.

The average what I can get is 1590-1660 ghs stable, but with 120C asics at the back of the machine.

Are here anybody who not downclocked them and tried something out?

 

Edit: my fans on 100% and i don't care the noise.  

yeah you want 1700gh fans at 100 and air temp at 10c with a solid 1200 want psu.

Now  if you really are truly desperate for that 1700 mark  build an open case and use a fan on each heat sink.  make sure the air is 10c.

I can do it but my power cost makes it stupid for me to do.

lay the 1st board then the controller then the second board                    
 
1 board                                                  2 board
_________                                           ________
 HS HS           ----------controller--------    HS HS
_______                                              ________
  

 ^^                                                             ^^
fan fan                                                     fan fan



the above lay out  would allow for much better cooling.  you void your warranty but have the satisfaction of 1725gh at 1250 watts

[ElGabo]

This thread turned the: how to downclock the SP20....  

I'd like to push them to as much ghs as I can....

Any ideas to improve cooling?

What I see the stock heatsinks are too small to keep the asics cool for countinous 1700ghs.

I was able to reach it for a while but I needed 15-16 C intake.

The average what I can get is 1590-1660 ghs stable, but with 120C asics at the back of the machine.

Are here anybody who not downclocked them and tried something out?

 

Edit: my fans on 100% and i don't care the noise.  

yeah you want 1700gh fans at 100 and air temp at 10c with a solid 1200 want psu.

Now  if you really are truly desperate for that 1700 mark  build an open case and use a fan on each heat sink.  make sure the air is 10c.

I can do it but my power cost makes it stupid for me to do.

lay the 1st board then the controller then the second board                    
 
1 board                                                  2 board
_________                                           ________
 HS HS           ----------controller--------    HS HS
_______                                              ________
  

 ^^                                                             ^^
fan fan                                                     fan fan



the above lay out  would allow for much better cooling.  you void your warranty but have the satisfaction of 1725gh at 1250 watts

Sure it's possible.

BUT

I don't want to do that more than 20 machines... (Maybe more if I change my other gear)

I don't need 1725ghs, my problem is not here. I made my calculations with 1670-1680ghs.

1650 is still no problem, not a big diffrence but if you calculate with 20 machines (round number) it's 600ghs less.

I'm testing the gear, when I make 13-22C intake the hasrate is between 1630-1680.

With 22-26C inlet I got only 1590-1600Ghs. (At summer I'll have about 28-32C)

It's winter here now, but with this machines I will have some problem at summer. (I won't able to do 10C for sure.  )

To turn back to the calculation: 20*80ghs= 1600ghs less due to overheating.

Don't misunderstood me, I'm not whining about the machines, I like them and the engineering behind them.

I will break even until summer.

But the profit will be less then estimated.

On the other hand.

I'm running a good ammount (I don't write huge ammount because I think these days it's the petahash range) of an other manufacturer's machines.

They were running in 40C at the summer and they worked rock solid as advertised. (I had to improve the cooling meanwhile but it's an other story.)

So I'm looking a DOABLE fix cooling solution for the machines. Some push pull configs, custom heatsinks, or everything else what somebody tried out.

I'm working on this me myself too but I don't want to invent the wheel if somebody have a good idea.

[ElGabo]

I think good start is to add 8 small fans on each chip heatsink. Of course keep the main big fan.

The problem is that you can't fit them on the heatsinks.

I will check how many space is avaliable. But if the space is enough, first have to stabilize the heatsinks and I think this is the harder part.

The heatsink is fixed with 2 screws and they moving on the asics.

To improve the cooling, high cfm small fans needed but now I can't see a chance to fit them on the heatsinks. (Maybe work something out after the holiday season but I see a litle chance to solve it.)

Edit: I will be more clever after New Year's eve. Now i'm just writing by heart from under the christmas tree  .

[klondike_bar]

^This is really making a big issue over pulling an extra 50GH out of a unit - a value of less than $18. voiding warranty or buying a second $20 fan and spending the time to install it is not worth it.

At the peak speeds, any improvements you make come at the cost of about 1-1.2W/GH. Running at 1500GH uses approx 210W less than running at 1700GH. Unless you have very cheap power it will likely make sense by summertime to throttle back the hardware to improve the overall efficiency - or have heat problems.

I personally have 3 arriving this week that I hope to achieve ~1400GH/800W so that the fan can be kept at a reasonable volume. At $0.15/kwh it doesnt make much sense for me to try and get another 300GH/400W out of the unit, as the added hashrate gains are entirely spent on added power draw. Same reason as Ive throttled my SP10 units from 1400Gh to 1260GH to save 200W

[MrTeal]

^This is really making a big issue over pulling an extra 50GH out of a unit - a value of less than $18. voiding warranty or buying a second $20 fan and spending the time to install it is not worth it.

At the peak speeds, any improvements you make come at the cost of about 1-1.2W/GH. Running at 1500GH uses approx 210W less than running at 1700GH. Unless you have very cheap power it will likely make sense by summertime to throttle back the hardware to improve the overall efficiency - or have heat problems.

I personally have 3 arriving this week that I hope to achieve ~1400GH/800W so that the fan can be kept at a reasonable volume. At $0.15/kwh it doesnt make much sense for me to try and get another 300GH/400W out of the unit, as the added hashrate gains are entirely spent on added power draw. Same reason as Ive throttled my SP10 units from 1400Gh to 1260GH to save 200W

Take a look at the formula I posted earlier. With $320/BTC, $0.15/kWh and current difficulty, your maximum profit would actually be at 1370GH/s @ 827W, making revenue of $5.59 a day with a power cost of $2.98, for a profit of $2.60/day.

Obviously individual preferences for prioritizing BTC production, etc might change that, or if your efficiency numbers vary much from 2GOOD's, but at least it gives an idea that for a lot of people trying to run at 1700W might not make a bunch of sense.

I'm looking at automating the setting of voltage on a daily basis to maximize profitability. For those interested, I whipped up a quick formula for calculating your maximum profit with an SP20 using 2GOOD's efficiency numbers.
LN((20116.26*(BR/D)*P)/(0.00417093689255513*C))/0.001368351
BR = Block reward
D = Difficulty
P = Bitcoin Price
C = cost of electricity (in $/kWh)

There's no bound on it, so obviously if it gives you >1700 or <800, you'd have to limit it.

[Duce]

SP Tech, so what is new in FW 2.5.61 other than the changes with the setup features that were introduced in a previous version? I have been running the current version for the last six hours and it seems to be working better than 2.5.58 or 2.5.59 which I see were taken off. As it is rather painless to upgrade, and these are my first SP units, I have been pushing the upgrades as they came in. The 2.5.58 did cause the miner to cycle cgminer on its own, something 2.5.59 did not do I am happy to say. I will continue to run with 2.5.61 and report back if there are an anomalies.

[mike9]

Take a look at the formula I posted earlier. With $320/BTC, $0.15/kWh and current difficulty, your maximum profit would actually be at 1370GH/s @ 827W, making revenue of $5.59 a day with a power cost of $2.98, for a profit of $2.60/day.

Obviously individual preferences for prioritizing BTC production, etc might change that, or if your efficiency numbers vary much from 2GOOD's, but at least it gives an idea that for a lot of people trying to run at 1700W might not make a bunch of sense.

I'm looking at automating the setting of voltage on a daily basis to maximize profitability. For those interested, I whipped up a quick formula for calculating your maximum profit with an SP20 using 2GOOD's efficiency numbers.
LN((20116.26*(BR/D)*P)/(0.00417093689255513*C))/0.001368351
BR = Block reward
D = Difficulty
P = Bitcoin Price
C = cost of electricity (in $/kWh)

There's no bound on it, so obviously if it gives you >1700 or <800, you'd have to limit it.

Thank you for this.  Much more elegant, and useful, than my profit table I cobbled together at incremental power costs versus a single over-clock and under-clock setting.  Can you tell me about the constants?  Thanks again.

[Biodom]

I'm looking at automating the setting of voltage on a daily basis to maximize profitability. For those interested, I whipped up a quick formula for calculating your maximum profit with an SP20 using 2GOOD's efficiency numbers.
LN((20116.26*(BR/D)*P)/(0.00417093689255513*C))/0.001368351
BR = Block reward
D = Difficulty
P = Bitcoin Price
C = cost of electricity (in $/kWh)

There's no bound on it, so obviously if it gives you >1700 or <800, you'd have to limit it.

Interesting, I got 1587Gh for 0.11/kwh electricity.
I can't use it at this setting, though, because I would have to run the fan at 80-100, which would not be optimal inside the house, especially for three units.
Another consideration: i am thinking of running one SP20 and one S5 on each 110V/15A circuit (this way each circuit would produce ~2.5Th, which is awesome). I thought that it is possible if SP20 is limited to ~800-820W+~600W for S5.

[MrTeal]

Take a look at the formula I posted earlier. With $320/BTC, $0.15/kWh and current difficulty, your maximum profit would actually be at 1370GH/s @ 827W, making revenue of $5.59 a day with a power cost of $2.98, for a profit of $2.60/day.

Obviously individual preferences for prioritizing BTC production, etc might change that, or if your efficiency numbers vary much from 2GOOD's, but at least it gives an idea that for a lot of people trying to run at 1700W might not make a bunch of sense.

I'm looking at automating the setting of voltage on a daily basis to maximize profitability. For those interested, I whipped up a quick formula for calculating your maximum profit with an SP20 using 2GOOD's efficiency numbers.
LN((20116.26*(BR/D)*P)/(0.00417093689255513*C))/0.001368351
BR = Block reward
D = Difficulty
P = Bitcoin Price
C = cost of electricity (in $/kWh)

There's no bound on it, so obviously if it gives you >1700 or <800, you'd have to limit it.

Thank you for this.  Much more elegant, and useful, than my profit table I cobbled together at incremental power costs versus a single over-clock and under-clock setting.  Can you tell me about the constants?  Thanks again.

The constants are an amalgamation of things. You profit is really revenue - cost.
Revenue is BTC/day (20116.26 * BR / D) times the price (P)
Cost is the cost of energy (W * (1kW/1000W) * 24hrs/day * C ($/kWh)) in dollars
What I did was graph 2GOOD's efficiency numbers to get an exponential equation, Power(W) = 127*exp(0.001368351*Hashrate(in GH/s)). Sub in equation in place of power, and then your profit is simply a factor of your hashrate (if the other variable things are treated as constants each day).
Profit = 20116.26*(BR*HR/D)*P-127.0061827629*EXP(0.001368351*HR)/1000*24*C
Just take the derivative of the profit equation, and hashrate goes away in the first term, and the constant in the exponent comes out of the exponent equation.
dProfit/dHashrate = 20116.26*(BR/D)*P-0.00417093689255513*C*EXP(0.001368351*HR)
The constant 0.00417093689255513 is just combining all the constants in the second term, = 127.0061827629 * 0.001368351 * 24 /1000

To find the maximum, set the derivative to 0 and solve for the hashrate. It's a classic min/max problem that you might get to teach applications of derivatives. Calculus isn't just for fun in highschool.

[Syke]

Another consideration: i am thinking of running one SP20 and one S5 on each 110V/15A circuit (this way each circuit would produce ~2.5Th, which is awesome). I thought that it is possible if SP20 is limited to ~800-820W+~600W for S5.

That should work if you have closer to 120V. If you really have only 110V, you'll need to limit the SP20 to more like 700W.

[ElGabo]

^This is really making a big issue over pulling an extra 50GH out of a unit - a value of less than $18. voiding warranty or buying a second $20 fan and spending the time to install it is not worth it.

At the peak speeds, any improvements you make come at the cost of about 1-1.2W/GH. Running at 1500GH uses approx 210W less than running at 1700GH. Unless you have very cheap power it will likely make sense by summertime to throttle back the hardware to improve the overall efficiency - or have heat problems.

I personally have 3 arriving this week that I hope to achieve ~1400GH/800W so that the fan can be kept at a reasonable volume. At $0.15/kwh it doesnt make much sense for me to try and get another 300GH/400W out of the unit, as the added hashrate gains are entirely spent on added power draw. Same reason as Ive throttled my SP10 units from 1400Gh to 1260GH to save 200W

Sorry @knlondike but you misunderstood me.

You calculate with a fix price of the machine.

Calculate cost and profit.

I'm not speeking about the only 50ghs but when the weather gets warmer this will be 100ghs (from 1680 ghs) or more.

At 20 pieces it's 2000ghs....

And i have room much more than 20....

I hope you unerstand why i'm trying to find some solution.....

[mike9]

I'm looking at automating the setting of voltage on a daily basis to maximize profitability. For those interested, I whipped up a quick formula for calculating your maximum profit with an SP20 using 2GOOD's efficiency numbers.
LN((20116.26*(BR/D)*P)/(0.00417093689255513*C))/0.001368351
BR = Block reward
D = Difficulty
P = Bitcoin Price
C = cost of electricity (in $/kWh)

There's no bound on it, so obviously if it gives you >1700 or <800, you'd have to limit it.

Thank you for this.  Much more elegant, and useful, than my profit table I cobbled together at incremental power costs versus a single over-clock and under-clock setting.  Can you tell me about the constants?  Thanks again.

The constants are an amalgamation of things. You profit is really revenue - cost.
Revenue is BTC/day (20116.26 * BR / D) times the price (P)
Cost is the cost of energy (W * (1kW/1000W) * 24hrs/day * C ($/kWh)) in dollars
What I did was graph 2GOOD's efficiency numbers to get an exponential equation, Power(W) = 127*exp(0.001368351*Hashrate(in GH/s)). Sub in equation in place of power, and then your profit is simply a factor of your hashrate (if the other variable things are treated as constants each day).
Profit = 20116.26*(BR*HR/D)*P-127.0061827629*EXP(0.001368351*HR)/1000*24*C
Just take the derivative of the profit equation, and hashrate goes away in the first term, and the constant in the exponent comes out of the exponent equation.
dProfit/dHashrate = 20116.26*(BR/D)*P-0.00417093689255513*C*EXP(0.001368351*HR)
The constant 0.00417093689255513 is just combining all the constants in the second term, = 127.0061827629 * 0.001368351 * 24 /1000

To find the maximum, set the derivative to 0 and solve for the hashrate. It's a classic min/max problem that you might get to teach applications of derivatives. Calculus isn't just for fun in highschool.

Whoa!  More than I expected, thank you again—and for the calculus refresher.  I'm paying more attention now than I ever did in high school (fun?!). One last more question, if I may: in my previous calcs, I used an empirical 0.012745 BTC/Th/day - you arrived there via block reward, difficulty, and 20116.26.  Where does 20116.26 come from? Representing luck?

Edit: Gh/Th

[klondike_bar]

^This is really making a big issue over pulling an extra 50GH out of a unit - a value of less than $18. voiding warranty or buying a second $20 fan and spending the time to install it is not worth it.

At the peak speeds, any improvements you make come at the cost of about 1-1.2W/GH. Running at 1500GH uses approx 210W less than running at 1700GH. Unless you have very cheap power it will likely make sense by summertime to throttle back the hardware to improve the overall efficiency - or have heat problems.

I personally have 3 arriving this week that I hope to achieve ~1400GH/800W so that the fan can be kept at a reasonable volume. At $0.15/kwh it doesnt make much sense for me to try and get another 300GH/400W out of the unit, as the added hashrate gains are entirely spent on added power draw. Same reason as Ive throttled my SP10 units from 1400Gh to 1260GH to save 200W

Sorry @knlondike but you misunderstood me.

You calculate with a fix price of the machine.

Calculate cost and profit.

I'm not speeking about the only 50ghs but when the weather gets warmer this will be 100ghs (from 1680 ghs) or more.

At 20 pieces it's 2000ghs....

And i have room much more than 20....

I hope you unerstand why i'm trying to find some solution.....

curious what you pay for power. I understand the aspect of clocking hardware to its limit if its profitable, but if you need to make >$10 in modifications to gain 50GH/60W per unit, plus have slightly more PSUs/TH it could be more practical to buy an extra SP20 for that extra 1.65TH/$500. If its a hobby to do modifications though thats another story

[Biodom]

Another consideration: i am thinking of running one SP20 and one S5 on each 110V/15A circuit (this way each circuit would produce ~2.5Th, which is awesome). I thought that it is possible if SP20 is limited to ~800-820W+~600W for S5.

That should work if you have closer to 120V. If you really have only 110V, you'll need to limit the SP20 to more like 700W.

Yeah, I usually have 117-122V, but even with 110V I thought that 15A outlets (typical for US) are rated for constant 13A, hence 13X110=1440W

[philipma1957]

...

curious what you pay for power. I understand the aspect of clocking hardware to its limit if its profitable, but if you need to make >$10 in modifications to gain 50GH/60W per unit, plus have slightly more PSUs/TH it could be more practical to buy an extra SP20 for that extra 1.65TH/$500. If its a hobby to do modifications though thats another story

this is what I did 9 sp20E's   and 1 s-5 all underclocked a lot works best for me. and I have to tear the whole thing down in may as my rates go to summer price of 16 cents.

In the cold wither I pay 13 cents but I get a lot of heat which lowers my  13 cents to 10 cents.

So extra units with  underclock works best for me.