NotFuzzyWarm
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Activity: 3668
Merit: 2604
Evil beware: We have waffles!
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May 02, 2017, 04:05:01 PM |
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It looks like the S9's currently for sale are from a previous batch, batch 12. Does anyone have them? How is the reliability?
What gives you the idea they are from batch-12? Their speed? I see nothing in the ad saying that they old/used miners. Speed all depends on how well the latest lots of chips from TSMC test. Bitmain will not sell miners from over 6-8 months back in the production order without stating that they are from an older run (or used). Last one I got is a batch-25. |
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ComputerGenie
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May 02, 2017, 04:22:59 PM |
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The B12 header has been on almost every S9 sale page since B11 (and at least 3 different total hashrates), that doesn't make them B12.
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If you have to ask "why?", you wouldn`t understand my answer.
Always be on the look out, because you never know when you'll be stalked by hit-men that eat nothing but cream cheese....
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GMPoison
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May 05, 2017, 01:31:30 PM
Last edit: May 05, 2017, 01:52:02 PM by GMPoison |
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Does anyone have the numbers on how much heat in BTU's an S9 puts out, and at what CFM? I want to calculate how much CFM my exhaust fans need to have so it exceeds the amount CFM that the miners (and swamp cooler) put out, and how much cooling I will need based upon how much heat the S9 (and dehumidifier) generates. Thanks!
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NotFuzzyWarm
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Activity: 3668
Merit: 2604
Evil beware: We have waffles!
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May 05, 2017, 02:01:26 PM |
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1st thought should be to Google 'convert watts to BTU'. Why does no one seem to know how to use search engines....
FWIW, BTU/hr=Watts x 3.4129
The CFM, fair question. Don't think there is any data on that. I believe the fans move 250CFM free-air but under load, pure guesswork. I'd ballpark it as around 150CFM
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GMPoison
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May 05, 2017, 02:29:27 PM |
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1st thought should be to Google 'convert watts to BTU'. Why does no one seem to know how to use search engines....
FWIW, BTU/hr=Watts x 3.4129
The CFM, fair question. Don't think there is any data on that. I believe the fans move 250CFM free-air but under load, pure guesswork. I'd ballpark it as around 150CFM
I didn't know figuring out BTU was as simple as plugging in the number of watts, I thought it was different for every machine. Some machines are less efficient so they put out more heat per watt, some are designed better than others so they put out less heat per watt, etc. was my line of logic. |
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NotFuzzyWarm
Legendary
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Activity: 3668
Merit: 2604
Evil beware: We have waffles!
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May 05, 2017, 02:48:49 PM |
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1st thought should be to Google 'convert watts to BTU'. Why does no one seem to know how to use search engines....
FWIW, BTU/hr=Watts x 3.4129
The CFM, fair question. Don't think there is any data on that. I believe the fans move 250CFM free-air but under load, pure guesswork. I'd ballpark it as around 150CFM
I didn't know figuring out BTU was as simple as plugging in the number of watts, I thought it was different for every machine. Some machines are less efficient so they put out more heat per watt, some are designed better than others so they put out less heat per watt, etc. was my line of logic. The miner efficiency is irrelevant and only compares hash rate to power used, has nothing to do with heat load. For any electric power heat source they are all 100% efficient. Power in = power out as heat. Cooling is of course another matter as it involves work moving heat from one location to another, not creating heat. In that case efficiency does matter but only in the sense that it takes x amount of power turned into y amount of mechanical energy (with losses turned into heat) to move z amount of heat energy. |
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VentMine
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May 05, 2017, 03:02:49 PM |
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1st thought should be to Google 'convert watts to BTU'. Why does no one seem to know how to use search engines....
FWIW, BTU/hr=Watts x 3.4129
The CFM, fair question. Don't think there is any data on that. I believe the fans move 250CFM free-air but under load, pure guesswork. I'd ballpark it as around 150CFM
I looked up the specs of the Antminer fans, they output 220 CFM at 6000 rpm with no diff pressure. In practice there will be diff pressure across the miner so it should be somewhat less. |
1ESSdoVYKm8sNtYMfdkFBajhAe2e6G8keH
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GMPoison
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May 05, 2017, 03:34:37 PM |
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Thank you both.
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coinits
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Merit: 1019
011110000110110101110010
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May 06, 2017, 03:44:22 PM |
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What would my daily BTC be from an S9 @13.5 TH/s?
I have a chance to buy one for $1800 Canadian funds that includes power supply.
Trying to determine ROI
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Jump you fuckers! | The thing about smart motherfuckers is they sound like crazy motherfuckers to dumb motherfuckers. | My sig space for rent for 0.01 btc per week.
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philipma1957
Legendary
 Online
Activity: 4158
Merit: 8054
'The right to privacy matters'
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May 06, 2017, 03:57:52 PM |
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What would my daily BTC be from an S9 @13.5 TH/s?
I have a chance to buy one for $1800 Canadian funds that includes power supply.
Trying to determine ROI
https://bitcoinwisdom.com/bitcoin/difficultyBTC/day 0.006504 before power cost so remember to include power cost which is about 30 k-watts a day |
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coinits
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Merit: 1019
011110000110110101110010
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May 06, 2017, 04:03:03 PM |
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What would my daily BTC be from an S9 @13.5 TH/s?
I have a chance to buy one for $1800 Canadian funds that includes power supply.
Trying to determine ROI
https://bitcoinwisdom.com/bitcoin/difficultyBTC/day 0.006504 before power cost so remember to include power cost which is about 30 k-watts a day Thanks. With power costs and exchange rate to CDN factored in it works out to $9.14 per day profit. So 197 days to ROI. |
Jump you fuckers! | The thing about smart motherfuckers is they sound like crazy motherfuckers to dumb motherfuckers. | My sig space for rent for 0.01 btc per week.
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ComputerGenie
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May 06, 2017, 05:20:37 PM |
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Thanks. With power costs and exchange rate to CDN factored in it works out to $9.14 per day profit. So 197 days to ROI.
If you did your maths correctly, I'm guessing that most people wish they had your cheap electric rates.  |
If you have to ask "why?", you wouldn`t understand my answer.
Always be on the look out, because you never know when you'll be stalked by hit-men that eat nothing but cream cheese....
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philipma1957
Legendary
Online
Activity: 4158
Merit: 8054
'The right to privacy matters'
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May 06, 2017, 06:03:33 PM |
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What would my daily BTC be from an S9 @13.5 TH/s?
I have a chance to buy one for $1800 Canadian funds that includes power supply.
Trying to determine ROI
https://bitcoinwisdom.com/bitcoin/difficultyBTC/day 0.006504 before power cost so remember to include power cost which is about 30 k-watts a day Thanks. With power costs and exchange rate to CDN factored in it works out to $9.14 per day profit. So 197 days to ROI. and do not forget the diff could go up and coin price could go down or stay steady but higher diff will slow the profit. So maybe 250 days not 200 |
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mat542
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May 11, 2017, 08:31:40 PM |
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Hello,
I couldn't find my answer on Bitmain's website.
Is it possible to change the frequency, to underclock or overclock, the S9-13.5TH/s and S9-11.5TH/s, that are sold at the moment on Bitmain's webshop ?
Thanks
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VRobb
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May 11, 2017, 08:37:00 PM |
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Hello,
I couldn't find my answer on Bitmain's website.
Is it possible to change the frequency, to underclock or overclock, the S9-13.5TH/s and S9-11.5TH/s, that are sold at the moment on Bitmain's webshop ?
Thanks
No, they auto-tune during each startup/reboot. Been that way for many batches now. |
I don't believe in superstition because it's bad luck: 13thF1oor6CAwyzyxXPNnRvu3nhhYeqZdc
These aren't the Droids you're looking for: S5 & S7 (Sold), R4B2, R4B4 (RIP), 2x S9 obsolete, 2xS15-28, S17-56, S17-70
Pushing a whopping 1/5 PH! Oh The SPEED!!!
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mat542
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May 11, 2017, 08:42:02 PM |
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No, they auto-tune during each startup/reboot. Been that way for many batches now. Thanks for the heads up. To bad  The 0.1 W/Gh/s is really nice but I wanted to use less power/watts, then the stock ~1300watts. |
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ComputerGenie
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May 11, 2017, 08:44:44 PM |
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No, they auto-tune during each startup/reboot. Been that way for many batches now. Thanks for the heads up. To bad The 0.1 W/Gh/s is really nice but I wanted to use less power/watts, then the stock ~1300watts. Did you also put a governor on your car that only lets it top out at 12 MPH?  |
If you have to ask "why?", you wouldn`t understand my answer.
Always be on the look out, because you never know when you'll be stalked by hit-men that eat nothing but cream cheese....
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tbonetony
Sr. Member
Offline
Activity: 441
Merit: 250
No zuo no die why you try, u zuo u die dont be shy
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May 11, 2017, 10:05:41 PM |
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No, they auto-tune during each startup/reboot. Been that way for many batches now. Thanks for the heads up. To bad The 0.1 W/Gh/s is really nice but I wanted to use less power/watts, then the stock ~1300watts. Did you also put a governor on your car that only lets it top out at 12 MPH? I think he mentioned in the other thread that he only had access to 400-watt ish power |
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ComputerGenie
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May 11, 2017, 10:32:16 PM |
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...
I think he mentioned in the other thread that he only had access to 400-watt ish power
400 watts of free electricity is not the same as only 400 watts of power.  |
If you have to ask "why?", you wouldn`t understand my answer.
Always be on the look out, because you never know when you'll be stalked by hit-men that eat nothing but cream cheese....
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bitsink
Member
Offline
Activity: 81
Merit: 10
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May 12, 2017, 09:11:28 PM |
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Hello,
I couldn't find my answer on Bitmain's website.
Is it possible to change the frequency, to underclock or overclock, the S9-13.5TH/s and S9-11.5TH/s, that are sold at the moment on Bitmain's webshop ?
Thanks
No, they auto-tune during each startup/reboot. Been that way for many batches now. This is simply not true! They run the autotune routine ONLY on first start or after a hard reset (possibly on other rare occasions), but definitely not after every restart be it clean or unclean. There is a flag set in the filesystem that triggers the autotune routine. Maybe somebody could point out where it is exactly - cannot remember off the top of my head. Source: Operating S9-13.5TH/s miner. |
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