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pekatete
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January 25, 2015, 05:36:09 PM |
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I know they have removed any references to the 9v under-volt from the product description now, but on release they said you can undervolt to 9v to achieve better efficiency, thus the quote for the rated voltage is for running the unit at standard settings, but I was refering to over-voltage here.
So the question remains, what is the safe overvolt voltage for the S5?
You know the answer to this already, 12V. No one else is going to officially validate that anything above 12V is safe. What purpose does it serve for you to affirm what you know I already know? And where in my question did I ask for official validation, bearing in mind that you know that I know that bitmain do not offer support for overclocking? Honestly, you need to find a day job and leave questions you clearly cannot answer to those that can. So the question stands, what is the safe overvolt voltage for the S5? |
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dogie
Legendary
 Offline
Activity: 1666
Merit: 1183
dogiecoin.com
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January 25, 2015, 05:39:19 PM |
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I know they have removed any references to the 9v under-volt from the product description now, but on release they said you can undervolt to 9v to achieve better efficiency, thus the quote for the rated voltage is for running the unit at standard settings, but I was refering to over-voltage here.
So the question remains, what is the safe overvolt voltage for the S5?
You know the answer to this already, 12V. No one else is going to officially validate that anything above 12V is safe. What purpose does it serve for you to affirm what you know I already know? And where in my question did I ask for official validation, bearing in mind that you know that I know that bitmain do not offer support for overclocking? Honestly, you need to find a day job and leave questions you clearly cannot answer to those that can. So the question stands, what is the safe overvolt voltage for the S5? As does the answer, 12V? |
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pekatete
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January 25, 2015, 06:05:17 PM |
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^^^
If 12v is the safe over-volt voltage for an S5, then what is the standard voltage for an S5? I mean, how thick can you be dogie or are you just being a pest?
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ZiG
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January 25, 2015, 06:38:56 PM |
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I know they have removed any references to the 9v under-volt from the product description now, but on release they said you can undervolt to 9v to achieve better efficiency, thus the quote for the rated voltage is for running the unit at standard settings, but I was refering to over-voltage here.
So the question remains, what is the safe overvolt voltage for the S5?
You know the answer to this already, 12V. No one else is going to officially validate that anything above 12V is safe. What purpose does it serve for you to affirm what you know I already know? And where in my question did I ask for official validation, bearing in mind that you know that I know that bitmain do not offer support for overclocking? Honestly, you need to find a day job and leave questions you clearly cannot answer to those that can. So the question stands, what is the safe overvolt voltage for the S5? As does the answer, 12V? As usual...Useless...  ZiG |
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ZiG
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January 25, 2015, 06:40:37 PM
Last edit: January 25, 2015, 06:51:42 PM by ZiG |
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^^^
If 12v is the safe over-volt voltage for an S5, then what is the standard voltage for an S5? I mean, how thick can you be dogie or are you just being a pest?
What are you expecting from dogie...  As usual...Useless... ZiG EDIT ...: From https://www.bitmaintech.com/files/download/BM1384_Datasheet_v2.1.pdf : "...Recommended Operation Conditions Symbol Parameter Min. Typ. Max. Unit VDD Core Voltage 0.65 0.8 1.1 V ..." So ...1.1V x 15 chips = 16.5V MAX Voltage for Overclocking ...by the official Datasheet... IMHO, to be on the save side ...no more than 13.5V - 14.0V will be the MAX...that I will be brave to try...  Experiment on your own risk...!!! |
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klondike_bar
Legendary
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Activity: 2128
Merit: 1005
ASIC Wannabe
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January 25, 2015, 06:45:38 PM |
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^^^
If 12v is the safe over-volt voltage for an S5, then what is the standard voltage for an S5? I mean, how thick can you be dogie or are you just being a pest?
I don't think he's trying to be thick, the S5 simply cant handle much more than 12V, unless you maybe had some serious cooling on it. If you run the S5 in near-zero environment its possible to get 1.3-1.4TH from it at clockrates of 400MHz-425MHz and ~700W consumption If you gave it 12.5V and sub-zero temperatures you might be able to get 1.4-1.55TH from clockrates of 400-437.5MHz and ~800W consumption but at that level the PCB and heatsinks might not keep up. tl'dr - dont go above 12V. its not really necessary as overclocking generally brings it to the thermal limit already, and increasing the voltage would radically increase w/gh |
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coinits
Legendary
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Activity: 1582
Merit: 1019
011110000110110101110010
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January 25, 2015, 06:53:48 PM |
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what software do you guys use to monitor how watts and/or volts are being consumed?
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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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ZiG
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January 25, 2015, 06:54:27 PM |
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^^^
If 12v is the safe over-volt voltage for an S5, then what is the standard voltage for an S5? I mean, how thick can you be dogie or are you just being a pest?
I don't think he's trying to be thick, the S5 simply cant handle much more than 12V, unless you maybe had some serious cooling on it. If you run the S5 in near-zero environment its possible to get 1.3-1.4TH from it at clockrates of 400MHz-425MHz and ~700W consumption If you gave it 12.5V and sub-zero temperatures you might be able to get 1.4-1.55TH from clockrates of 400-437.5MHz and ~800W consumption but at that level the PCB and heatsinks might not keep up. tl'dr - dont go above 12V. its not really necessary as overclocking generally brings it to the thermal limit already, and increasing the voltage would radically increase w/gh +1 ...klondike is completely CORRECT...You will be limited by the POWER envelope of the cooling heatsink(s)... ZiG |
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pekatete
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January 25, 2015, 07:07:17 PM |
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I don't think he's trying to be thick, the S5 simply cant handle much more than 12V, unless you maybe had some serious cooling on it.
We'll have to agree to disagree on that. If you run the S5 in near-zero environment its possible to get 1.3-1.4TH from it at clockrates of 400MHz-425MHz and ~700W consumption
If you gave it 12.5V and sub-zero temperatures you might be able to get 1.4-1.55TH from clockrates of 400-437.5MHz and ~800W consumption but at that level the PCB and heatsinks might not keep up.
I am not sure what you mean by near-zero environment but I already can squeeze 1350 GH/s @ 412.5 by simply keeping it in my shed, with 1 S3 fan running at full pelt in a pull configuration.  tl'dr - dont go above 12V. its not really necessary as overclocking generally brings it to the thermal limit already, and increasing the voltage would radically increase w/gh
And here-in lies the real question. Would I be able to achieve a better hash-rate (and efficiency) if I over-volted and under-clocked? e.g 13.5v @ 375 |
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ZiG
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January 25, 2015, 07:13:04 PM |
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I don't think he's trying to be thick, the S5 simply cant handle much more than 12V, unless you maybe had some serious cooling on it.
We'll have to agree to disagree on that. If you run the S5 in near-zero environment its possible to get 1.3-1.4TH from it at clockrates of 400MHz-425MHz and ~700W consumption
If you gave it 12.5V and sub-zero temperatures you might be able to get 1.4-1.55TH from clockrates of 400-437.5MHz and ~800W consumption but at that level the PCB and heatsinks might not keep up.
I am not sure what you mean by near-zero environment but I already can squeeze 1350 GH/s @ 412.5 by simply keeping it in my shed, with 1 S3 fan running at full pelt in a pull configuration. tl'dr - dont go above 12V. its not really necessary as overclocking generally brings it to the thermal limit already, and increasing the voltage would radically increase w/gh
And here-in lies the real question. Would I be able to achieve a better hash-rate (and efficiency) if I over-volted and under-clocked? e.g 13.5v @ 375 I don't think so... The "Art of Overclocking" is to find the MAX STABLE possible clock with MINIMUM Voltage needed... ZiG |
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dogie
Legendary
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Activity: 1666
Merit: 1183
dogiecoin.com
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January 25, 2015, 07:15:20 PM |
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what software do you guys use to monitor how watts and/or volts are being consumed?
Kill-a-watt's or similar physical power consumption monitors. |
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pekatete
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January 25, 2015, 07:24:10 PM |
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And here-in lies the real question. Would I be able to achieve a better hash-rate (and efficiency) if I over-volted and under-clocked? e.g 13.5v @ 375
I don't think so... The "Art of Overclocking" is to find the MAX STABLE possible clock with MINIMUM Voltage needed... ZiG Lets switch to the Art of OverVolting then ... Would I be able to achieve a better hash-rate (and / or efficiency) if I over-volted and under-clocked or do I have to give it a try to find out? |
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jusu_plus
Newbie
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Activity: 15
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January 25, 2015, 07:47:21 PM |
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Been running for a week successfully at 400MHZ ambient around 0 - 10 C....
Lets see what this miner is made from and clocked to 425MHz...
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klondike_bar
Legendary
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Activity: 2128
Merit: 1005
ASIC Wannabe
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January 25, 2015, 07:50:08 PM |
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I don't think he's trying to be thick, the S5 simply cant handle much more than 12V, unless you maybe had some serious cooling on it.
We'll have to agree to disagree on that. If you run the S5 in near-zero environment its possible to get 1.3-1.4TH from it at clockrates of 400MHz-425MHz and ~700W consumption
If you gave it 12.5V and sub-zero temperatures you might be able to get 1.4-1.55TH from clockrates of 400-437.5MHz and ~800W consumption but at that level the PCB and heatsinks might not keep up.
I am not sure what you mean by near-zero environment but I already can squeeze 1350 GH/s @ 412.5 by simply keeping it in my shed, with 1 S3 fan running at full pelt in a pull configuration. tl'dr - dont go above 12V. its not really necessary as overclocking generally brings it to the thermal limit already, and increasing the voltage would radically increase w/gh
And here-in lies the real question. Would I be able to achieve a better hash-rate (and efficiency) if I over-volted and under-clocked? e.g 13.5v @ 375 there's no point in doing that. Your hashrate might stay about the same but your efficiency would go from 0.5w/gh to ~0.6w/gh, and likely exceed the current amount of cooling you provide. I personally was able to get a stock unit with 5C intake to max out around 412.5MHz (going to 425MHz resulted in hashrate loss). The best ive seen is guys in below-zero (celcius) garages/sheds getting to 425-437.5MHz (1.4TH) before anything higher is a hashrate dropoff. in both cases actual chip temperatures dont seem to be the limiting factor as long as its below 65C so if you can get 412.5MHz at the most right now, supplying 13V might let you run at the same frequency and push out ~5% more hashrate at the expense of ~10% more power draw, which seems like a lot of work to squeeze out 70w/50gh more by running it outside of specs, not to mention that power efficiency on a 13V PSU is typically lower than a 12V-gold psu. |
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kreativling
Newbie
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Activity: 19
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January 25, 2015, 08:05:43 PM |
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IMHO you should just be happy if your Antminer has OC potential at all. My miner is barely running at default speed in a cold environment and produces more HW errors than I would like to see. So if you are one of the lucky ones with a "golden sample" maybe you could get even more out of it with a voltmod, but at that point you should probably buy a SP20 (watt/GH)?!
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pekatete
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January 25, 2015, 08:11:58 PM |
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And here-in lies the real question. Would I be able to achieve a better hash-rate (and efficiency) if I over-volted and under-clocked? e.g 13.5v @ 375
there's no point in doing that. Your hashrate might stay about the same but your efficiency would go from 0.5w/gh to ~0.6w/gh, and likely exceed the current amount of cooling you provide. I personally was able to get a stock unit with 5C intake to max out around 412.5MHz (going to 425MHz resulted in hashrate loss). The best ive seen is guys in below-zero (celcius) garages/sheds getting to 425-437.5MHz (1.4TH) before anything higher is a hashrate dropoff. in both cases actual chip temperatures dont seem to be the limiting factor as long as its below 65C so if you can get 412.5MHz at the most right now, supplying 13V might let you run at the same frequency and push out ~5% more hashrate at the expense of ~10% more power draw, which seems like a lot of work to squeeze out 70w/50gh more by running it outside of specs, not to mention that power efficiency on a 13V PSU is typically lower than a 12V-gold psu. Thanks for the detailed response and explanation behind the logic. I think my initial follow-up question was answered here: From https://www.bitmaintech.com/files/download/BM1384_Datasheet_v2.1.pdf : "...Recommended Operation Conditions Symbol Parameter Min. Typ. Max. Unit VDD Core Voltage 0.65 0.8 1.1 V ..." So ...1.1V x 15 chips = 16.5V MAX Voltage for Overclocking ...by the official Datasheet...IMHO, to be on the save side ...no more than 13.5V - 14.0V will be the MAX...that I will be brave to try... Experiment on your own risk...!!! Now I know the max voltage I can pump into an S5 is 16.5v .... I am not going to run this anytime soon as I do not have a PSU that can push out that much voltage, but I have one that can do a tad over its standard 12v, so I may be tempted to try that in the near future ... |
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KeezAZA
Full Member
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https://eloncity.io
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January 25, 2015, 09:07:20 PM |
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OBITER DICTA:
1. I have run my S5 with just 1 PCI-E connector to each board off a 550W PSU at stock freq and it run OK, though clearly the PSU was being overloaded.
2. Up to this day, I run all my overclocked S3's with just 2 PCI-E connecotrs without any issue despite it being recomended to use all 4.
[/quote]
Are you not under powering the boards by not powering both connectors? Or overloading the current 12v rail?
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pekatete
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January 25, 2015, 09:12:12 PM |
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I know they have removed any references to the 9v under-volt from the product description now, but on release they said you can undervolt to 9v to achieve better efficiency, thus the quote for the rated voltage is for running the unit at standard settings, but I was refering to over-voltage here.
So the question remains, what is the safe overvolt voltage for the S5?
OBITER DICTA:
1. I have run my S5 with just 1 PCI-E connector to each board off a 550W PSU at stock freq and it run OK, though clearly the PSU was being overloaded.
2. Up to this day, I run all my overclocked S3's with just 2 PCI-E connecotrs without any issue despite it being recomended to use all 4.
Are you not under powering the boards by not powering both connectors? Or overloading the current 12v rail? For the S5, going by the HW%, I was not underpowering the boards at all running at stock freq, however, I was clearly overloading the 12v rail (I've never known that particular PSU blow so much hot air, literally!) For the S3 I am neither under-powering the boards nor overloading the the 12v rail. |
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Tupsu
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January 25, 2015, 09:12:49 PM |
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Are you not under powering the boards by not powering both connectors? Or overloading the current 12v rail?
If it is single rail PSU, then the answer is NO. |
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aurel57
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Activity: 1176
Merit: 1000
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January 25, 2015, 09:27:36 PM |
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bitmain again increased the price of S5.
maybe they should price them in BTC if thay want to track BTC price ?
 Was thinking the same thing. Was waiting for BTC to go up before ordering and I guess it didn't matter. |
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