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 Author Topic: [ANN] Spondoolies-Tech - carrier grade, data center ready mining rigs  (Read 1256279 times) This is a self-moderated topic. If you do not want to be moderated by the person who started this topic, create a new topic.
Biodom
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 December 29, 2014, 06:02:31 AM

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.
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MrTeal
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 December 29, 2014, 06:09:54 AM

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
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 December 29, 2014, 06:36:51 AM

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
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 December 29, 2014, 07:42:05 AM

^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.....

" I'm waiting for my punishment, I know it's on my way
So cut, cut, cut me up and fuck, fuck, fuck me up"
mike9
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 December 29, 2014, 08:07:07 AM

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
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ASIC Wannabe

 December 29, 2014, 05:04:55 PM

^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

24" PCI-E cables with 16AWG wires and stripped ends - great for server PSU mods, best prices https://bitcointalk.org/index.php?topic=563461
No longer a wannabe - now an ASIC owner!
Biodom
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 December 29, 2014, 05:29:08 PM

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
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 December 29, 2014, 05:43:51 PM

...

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.

I see BTC as the super highway and alt coins as taxis and trucks needed to move transactions.
MrTeal
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 December 29, 2014, 06:02:12 PM

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
On average it takes ~2^32 (no exactly, it's actually 65535/2^48) hashes to find a diff1 share, and D diff1 shares to find a block. IE, it takes D*2^32 hashes to find a block.

Therefore, your expected chance of finding a block per second is HR/(D*2^32), and thus your expected reward is BR*HR/(D*2^32). 86400 seconds in a day, so expected BTC/day is BR*HR*86400/(D*2^32), or 0.00002011626*BR*HR/D. I just multiplied that by 10^9 to give the result in GH/s.
ElGabo
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 December 29, 2014, 08:44:04 PM

^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

Ok I'll give up...

For me it's not hobby... It was a hobby with a Jupiter and some S1-s.

Maybe would be practical to buy one more unit for sure. But I have a lot of high cfm fans and other parts laying around....

But at this point I give up. You don't know a lot of details so you can't make a judgement what am i do and why. But trust me, I have the reasons.

So back to the original question.

Any ideas to improve the cooling?

" I'm waiting for my punishment, I know it's on my way
So cut, cut, cut me up and fuck, fuck, fuck me up"
Biodom
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Merit: 1286

 December 29, 2014, 08:51:42 PM

Just got off the phone with DHL regarding my GB SP20.
The miners are at their facility since 7:58 this am, but they won't deliver until tomorrow (Tue) because tomorrow is the "official" delivery day.
Did you ever hear this load of...? Sitting on a package for >24 hours because they can. I am sure that Spondoolies is unaware of such happenings.
philipma1957
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Activity: 2590
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 December 29, 2014, 08:51:59 PM

^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

Ok I'll give up...

For me it's not hobby... It was a hobby with a Jupiter and some S1-s.

Maybe would be practical to buy one more unit for sure. But I have a lot of high cfm fans and other parts laying around....

But at this point I give up. You don't know a lot of details so you can't make a judgement what am i do and why. But trust me, I have the reasons.

So back to the original question.

Any ideas to improve the cooling?

Do you live in a winter climate?   do you have a home?  can you get cold air to flow from outside to the intake on the miners.

open a window put box fans in the window blow in cold air to the intake of the miners then open a second window let the hot air blow out.

you would need 2 windows and a room with a shut door to do this build a pair of vents to direct the air.  you say you have 20 of these

so they stack 5 high  make a 4 by 5 stack of them  direct the cold air in and the hot air out.

I see BTC as the super highway and alt coins as taxis and trucks needed to move transactions.
ElGabo
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 December 29, 2014, 09:06:12 PM

^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

Ok I'll give up...

For me it's not hobby... It was a hobby with a Jupiter and some S1-s.

Maybe would be practical to buy one more unit for sure. But I have a lot of high cfm fans and other parts laying around....

But at this point I give up. You don't know a lot of details so you can't make a judgement what am i do and why. But trust me, I have the reasons.

So back to the original question.

Any ideas to improve the cooling?

Do you live in a winter climate?   do you have a home?  can you get cold air to flow from outside to the intake on the miners.

open a window put box fans in the window blow in cold air to the intake of the miners then open a second window let the hot air blow out.

you would need 2 windows and a room with a shut door to do this build a pair of vents to direct the air.  you say you have 20 of these

so they stack 5 high  make a 4 by 5 stack of them  direct the cold air in and the hot air out.

I would like to find a solution to each machines.

It's winter here now but I have to figure out something for the summer too....

" I'm waiting for my punishment, I know it's on my way
So cut, cut, cut me up and fuck, fuck, fuck me up"
windpath
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Activity: 1256
Merit: 1022

 December 29, 2014, 09:10:53 PM

Looking for some SP20 help; things I've tried:

Restart
Swap PSUs

They are running on 2x EVGA 750W PSUs each:

loudnes
Newbie

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 December 29, 2014, 09:13:42 PM

^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

Ok I'll give up...

For me it's not hobby... It was a hobby with a Jupiter and some S1-s.

Maybe would be practical to buy one more unit for sure. But I have a lot of high cfm fans and other parts laying around....

But at this point I give up. You don't know a lot of details so you can't make a judgement what am i do and why. But trust me, I have the reasons.

So back to the original question.

Any ideas to improve the cooling?

Improving is easy.
Good polish aluminum heatsink and the cooper block to mirror look, then put some good thermal paste, then put more powerful fan...

Or go hard like this https://www.youtube.com/watch?v=PtufuXLvOok
ElGabo
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Activity: 636
Merit: 500

 December 29, 2014, 09:17:21 PM

Looking for some SP20 help; things I've tried:

Restart
Swap PSUs

They are running on 2x EVGA 750W PSUs each:

One Psu is faulty.

I had once nearly the same problem with one of my server psu-s but I had only on loop disabling.

I've changed to an other one and the machine runs fine since them.

Simply the machine didn't liked the psu. Maybe some noise or something, I don't know.

Long story short. Grab a new psu, change it and you'll be right.

(But it's only my opinion.)

" I'm waiting for my punishment, I know it's on my way
So cut, cut, cut me up and fuck, fuck, fuck me up"
Biffa
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Merit: 1061

 December 29, 2014, 09:19:02 PM

Looking for some SP20 help; things I've tried:

Restart
Swap PSUs

They are running on 2x EVGA 750W PSUs each:

On both machines only one board is hashing out of the two.

In the first pic one the second board is hashing, in the second pic the first board is hashing.

Focus on one at a time, if you swap the PSU's to the dead boards sockets does it come up?

Swap PSUs and take another screen shot.

Mine at pools that pay transaction fees & don't mine empty blocks :: kanopool :: ckpool ::
:: Dalcore's Crypto Mining H/W Hosting Directory & Reputation ::
Biffa
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Activity: 2002
Merit: 1061

 December 29, 2014, 09:19:40 PM

Looking for some SP20 help; things I've tried:

Restart
Swap PSUs

They are running on 2x EVGA 750W PSUs each:

One Psu is faulty.

I had once nearly the same problem with one of my server psu-s but I had only on loop disabling.

I've changed to an other one and the machine runs fine since them.

Simply the machine didn't liked the psu. Maybe some noise or something, I don't know.

Long story short. Grab a new psu, change it and you'll be right.

(But it's only my opinion.)

He's got two SP20's and 4PSU's

Mine at pools that pay transaction fees & don't mine empty blocks :: kanopool :: ckpool ::
:: Dalcore's Crypto Mining H/W Hosting Directory & Reputation ::
ElGabo
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 December 29, 2014, 09:22:37 PM

^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

Ok I'll give up...

For me it's not hobby... It was a hobby with a Jupiter and some S1-s.

Maybe would be practical to buy one more unit for sure. But I have a lot of high cfm fans and other parts laying around....

But at this point I give up. You don't know a lot of details so you can't make a judgement what am i do and why. But trust me, I have the reasons.

So back to the original question.

Any ideas to improve the cooling?

Improving is easy.
Good polish aluminum heatsink and the cooper block to mirror look, then put some good thermal paste, then put more powerful fan...

Or go hard like this https://www.youtube.com/watch?v=PtufuXLvOok

Mineral oil LOL.

" I'm waiting for my punishment, I know it's on my way
So cut, cut, cut me up and fuck, fuck, fuck me up"
ElGabo
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 December 29, 2014, 09:27:08 PM

Looking for some SP20 help; things I've tried:

Restart
Swap PSUs

They are running on 2x EVGA 750W PSUs each:

One Psu is faulty.

I had once nearly the same problem with one of my server psu-s but I had only on loop disabling.

I've changed to an other one and the machine runs fine since them.

Simply the machine didn't liked the psu. Maybe some noise or something, I don't know.

Long story short. Grab a new psu, change it and you'll be right.

(But it's only my opinion.)

He's got two SP20's and 4PSU's

Sorry misread it. I've thinked the pictures about one machine before and after he swapped the psu-s.

This way Biffa has the truth, try to put the 2 psu-s from the 2 working blades to one machine and check it.

" I'm waiting for my punishment, I know it's on my way
So cut, cut, cut me up and fuck, fuck, fuck me up"
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