From ultimaterc.com :
"Or use a single 2k-10k pot with the outer legs tied to pins 3 and 5 and the center wiper to pin 9 for voltage adjustment above and below 12v. "
I tested 10k trimpot which I used for S1 undervolting and got 10.5-13.8V until over and under protection kicked in.
DPS-600 goes little over specs with overclocked S5 but I have used them 24/7 since I got my first or second batch S5.
ESP135 has slow speed fan connected at factory otherwise specs are same, fan is auto adjusted to temperature, but some modells start at full speed if You don't connect pin 4 to ground .
Topic: Antminer S5 - Underclock - Undervolt - Best J/GH - page 12. (Read 31090 times)
I have tested them with outboard trimpot and they can adjust to 10.5V. I haven't feed low voltage to the miners yet.
Where did you connect the trimpot?
OK I had a couple of HP DPS-600 PSU's as I had bought them because they were reported as being adjustable. The ones I have are marked Series ESP135 Model PS-3601-1C but are reported on the Net as being the same. They have the same HP Spares number 338022-001.
I tried the voltage reduction pot when I first got them, 5K pot from (-12V to the Voltage input pin) but it resulted in almost no adjustment and then the PSU went bang... So I put it to one side and got on with other things.
So this Morning tried the second DPS-600 and it works fine. I can adjust from 12.3V down to 10.6V. I suspect it would go further with a greater -ve voltage? What went wrong with the first one we will never know?
So I will give the PSU a try on the S5 and see if it can deliver the current when the voltage is reduced? If it does the only snag I can see is that they are reported to be only 81% efficient and presumably that is at 12V, so may be worse at a lower voltage? This could throw away a lot of the gain, so will have to make some measurements.
Rich
Per the specs on the S7, it might not be ABLE to undervolt - and almost definitely won't undervolt to the point a single 600ish Watt PS will run it.
UnderCLOCK might get there, can't hurt to try it.
I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.
Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.
UnderCLOCK might get there, can't hurt to try it.
I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.
Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.
you don't understand my goals.
sound is my issue. I have a 2.4 cent location but I need quiet gear there.
which means fans need to be swapped. power needs to be cut. I also need to find bottom voltage. For longer use.
The net is difficult to explain in detail as people do not like to read long posts.
BTW if I am correct this machine can do 0.20 watts or maybe 0.18 watts if so then a 636 watt psu will allow a down clock to 3000gh.
I will have a close to silent s-7 that is more efficient then any other piece of gear on the market.
At 2.4 cents and 0.18 watts this gear will survive the ½ ing
Hey Phil, is your location taking other peoples hardware also? I would be glad if my Hardware would be hosted in such a location, since here in EU i pay 20€ cents for the KW/h...
I have tested them with outboard trimpot and they can adjust to 10.5V. I haven't feed low voltage to the miners yet.
Where did you connect the trimpot?
I have used HP DPS-600 server powers on S5s upto 400mhz and they have been running 381mhz for months now.
0.001% error rate at 381mhz, powers are 47A but seems to work over specs and are dirty cheap from Ebay.
I have tested them with outboard trimpot and they can adjust to 10.5V. I haven't feed low voltage to the miners yet.
DPS-600 have a current share port so at least 2 can work parallel on S7 maybe.
0.001% error rate at 381mhz, powers are 47A but seems to work over specs and are dirty cheap from Ebay.
I have tested them with outboard trimpot and they can adjust to 10.5V. I haven't feed low voltage to the miners yet.
DPS-600 have a current share port so at least 2 can work parallel on S7 maybe.
If you're losing 10% efficiency by getting those PSUs, why not use the PSUs you already have and use a good volt step down at 95-98% efficiency? Depending on what you have on hand it would be more efficient and more effective?
This is one of the several other options I am considering. Top of the list would be to be able to adjust down a Platinum 95% Server. Weather a lower efficiency adjustable PSU is better than a VRM on the output of a Platinum PSU needs some calcs & measurements to be made. I have ordered a couple of the VRM modules that Phil identified and we will see how those perform when they get here.
Rich
well one of the meanwells is 92% the other is 88%
of course the 92% is the more expensive choice 198 usd for 1 and 170 usd for 10
note the A at the end of the model is the pot adjustment model
http://www.trcelectronics.com/View/Mean-Well/HLG-600H-12A.shtml
https://www.trcelectronics.com/ecomm/pdf/hlg600h.pdf
the cheaper one is 88%
121 usd for 1 108 usd for 9
http://www.trcelectronics.com/View/Mean-Well/HRP-600-12.shtml
https://www.trcelectronics.com/ecomm/pdf/hrp600.pdf
The 92% is fanless and maxes at 480 watts 24/7/365 but I would think a fan lets it run with a bit more power.
I purchased the 88%.
It arrives next weds I am waiting on the s-7's
I will try to run 2 blades of the 3 under volts and under freq
I will try to run 3 blades of the 3 under volts and under freq.
If I lower the power to 600 watts and get .18 watts a gh
I am at 3333gh
The gear will be quiet.-------------really big for me
and at .18 per gh I am ahead of the field
If it does not work I only spent 128 with the shipping to find out.
Nice modding around here guys 
I just got me an adjustable PSU and let the games begin
I just got me an adjustable PSU and let the games begin
If you're losing 10% efficiency by getting those PSUs, why not use the PSUs you already have and use a good volt step down at 95-98% efficiency? Depending on what you have on hand it would be more efficient and more effective?
This is one of the several other options I am considering. Top of the list would be to be able to adjust down a Platinum 95% Server. Weather a lower efficiency adjustable PSU is better than a VRM on the output of a Platinum PSU needs some calcs & measurements to be made. I have ordered a couple of the VRM modules that Phil identified and we will see how those perform when they get here.
Rich
If you're losing 10% efficiency by getting those PSUs, why not use the PSUs you already have and use a good volt step down at 95-98% efficiency? Depending on what you have on hand it would be more efficient and more effective?
Doing a general search on the net and ebay Meanwell have a very big range of PSU's. Quite a lot of them show adjustment from 10 or 10.2 Volts. They seem to have a good name in the PSU World and there are good data sheets on them, so definitely a cut above your average Chinese PSU manufacturer.
There are so many available that I need to spend a bit of time researching them carefully but will probably then buy one. The other "idea" I am considering is 2 x 5V PSU's in series if I can find a couple at a good price to play with. They typically have adjustment from 4.5V to 5.5V which then gives an almost ideal 9V to 11V range.
My only concern with all the Meanwell supplies is that the efficiency is typically under 85% to 88% so not up tere with a Platinum Server PSU with 95%. Need to do some maths to make sure you are not throwing away too much?
Rich
There are so many available that I need to spend a bit of time researching them carefully but will probably then buy one. The other "idea" I am considering is 2 x 5V PSU's in series if I can find a couple at a good price to play with. They typically have adjustment from 4.5V to 5.5V which then gives an almost ideal 9V to 11V range.
My only concern with all the Meanwell supplies is that the efficiency is typically under 85% to 88% so not up tere with a Platinum Server PSU with 95%. Need to do some maths to make sure you are not throwing away too much?
Rich
Well, I dont think so (saw it for $240 and just thought "no way") so, 128USD is really good.
My 700W Server PSU (HP G5 412211-001) has a pot for voltage adjustment, but it adjusts between 12.6 - 12.004 V - it keeps the 12V under load. Even having a pot on a PSU doesnt imply the opportunity for a propper adjustment rate. So in my case it couldnt be worse.
My 700W Server PSU (HP G5 412211-001) has a pot for voltage adjustment, but it adjusts between 12.6 - 12.004 V - it keeps the 12V under load. Even having a pot on a PSU doesnt imply the opportunity for a propper adjustment rate. So in my case it couldnt be worse.
perfect, so here is the "flip the penny twice" thread. Im getting @ 11.1V ~0.48 - 0.47J/Gh and I always tought it is a good result. So there is even more in it.
yes there is now if you can find these 2 psu at a good price even better
perfect, so here is the "flip the penny twice" thread. Im getting @ 11.1V ~0.48 - 0.47J/Gh and I always tought it is a good result. So there is even more in it.
The only adjstable PSU (10.2-13.8V) with 88% efficiency I saw, was a Meanwell HRP-600.
The only adjstable PSU (10.2-13.8V) with 88% efficiency I saw, was a Meanwell HRP-600.
Per the specs on the S7, it might not be ABLE to undervolt - and almost definitely won't undervolt to the point a single 600ish Watt PS will run it.
UnderCLOCK might get there, can't hurt to try it.
I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.
Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.
UnderCLOCK might get there, can't hurt to try it.
I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.
Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.
you don't understand my goals.
sound is my issue. I have a 2.4 cent location but I need quiet gear there.
which means fans need to be swapped. power needs to be cut. I also need to find bottom voltage. For longer use.
The net is difficult to explain in detail as people do not like to read long posts.
BTW if I am correct this machine can do 0.20 watts or maybe 0.18 watts if so then a 636 watt psu will allow a down clock to 3000gh.
I will have a close to silent s-7 that is more efficient then any other piece of gear on the market.
At 2.4 cents and 0.18 watts this gear will survive the ½ ing
Per the specs on the S7, it might not be ABLE to undervolt - and almost definitely won't undervolt to the point a single 600ish Watt PS will run it.
UnderCLOCK might get there, can't hurt to try it.
I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.
Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.
UnderCLOCK might get there, can't hurt to try it.
I don't see the point of that much underclock on it though, if you have to crank it down that far to be profitable, your electric rate is so high you really shouldn't waste power on mining.
Unlike previous Bitmain miners, they are NOT running the S7 at the max voltage rating of the BM1385, they actually picked the MIDpoint of it's (so far) published voltage options.
I have found a 636 watt psu 88% efficient but costly at 128 usd.
I have 2 s-7's on order and I have one of these psu's on order
http://www.onlinecomponents.com/datasheet/hrp60012.aspx?p=37810156
model is Mean Well HRP-600-12
adjusts 10.2 to 13.8 88% eff
I even found the absolutely best possible psu but it cost even more
http://www.onlinecomponents.com/mean-well-hlg600h12a.html?p=45585982
http://www.onlinecomponents.com/datasheet/hlg600h12a.aspx?p=45585982
HLG-600H-12A
note that A means it has a pot adjustment 10.2 to 12.6
this is 92% eff with no fan! but it is 198 usd and is only 480watts
It does allow for a quieter miner but is too pricey.
With the cheap model HRP-600-12 I get up to 636 watts.
I will find a freq that allows me to run at 600 watts and 2400 gh. say 150 vs 300
I will test it with the evga 1600 p2 making sure I am doing around 600 watts I will remove it
I will then use the meanwell and once it fires up at freq 150 2400gh 600 watts 12 volts.
I will back the pot down to 10.8 we should get a good watt drop off and the machine should run well. maybe 500 watts for 2400 gh
I will then know if the s-7 has lower watt then rated.
I have 2 s-7's on order and I have one of these psu's on order
http://www.onlinecomponents.com/datasheet/hrp60012.aspx?p=37810156
model is Mean Well HRP-600-12
adjusts 10.2 to 13.8 88% eff
I even found the absolutely best possible psu but it cost even more
http://www.onlinecomponents.com/mean-well-hlg600h12a.html?p=45585982
http://www.onlinecomponents.com/datasheet/hlg600h12a.aspx?p=45585982
HLG-600H-12A
note that A means it has a pot adjustment 10.2 to 12.6
this is 92% eff with no fan! but it is 198 usd and is only 480watts
It does allow for a quieter miner but is too pricey.
With the cheap model HRP-600-12 I get up to 636 watts.
I will find a freq that allows me to run at 600 watts and 2400 gh. say 150 vs 300
I will test it with the evga 1600 p2 making sure I am doing around 600 watts I will remove it
I will then use the meanwell and once it fires up at freq 150 2400gh 600 watts 12 volts.
I will back the pot down to 10.8 we should get a good watt drop off and the machine should run well. maybe 500 watts for 2400 gh
I will then know if the s-7 has lower watt then rated.
Will be very interested in how you get on. I can run my S5 at the default 350MHz on 11V with no HW errors with a good saving. The HLG-600H series looks very nice, with high efficiency, no fan and a good range of adjustment, pity it's so expensive.
Rich
I have found a 636 watt psu 88% efficient but costly at 128 usd.
I have 2 s-7's on order and I have one of these psu's on order
http://www.onlinecomponents.com/datasheet/hrp60012.aspx?p=37810156
model is Mean Well HRP-600-12
adjusts 10.2 to 13.8 88% eff
I even found the absolutely best possible psu but it cost even more
http://www.onlinecomponents.com/mean-well-hlg600h12a.html?p=45585982
http://www.onlinecomponents.com/datasheet/hlg600h12a.aspx?p=45585982
HLG-600H-12A
note that A means it has a pot adjustment 10.2 to 12.6
this is 92% eff with no fan! but it is 198 usd and is only 480watts
It does allow for a quieter miner but is too pricey.
With the cheap model HRP-600-12 I get up to 636 watts.
I will find a freq that allows me to run at 600 watts and 2400 gh. say 150 vs 300
I will test it with the evga 1600 p2 making sure I am doing around 600 watts I will remove it
I will then use the meanwell and once it fires up at freq 150 2400gh 600 watts 12 volts.
I will back the pot down to 10.8 we should get a good watt drop off and the machine should run well. maybe 500 watts for 2400 gh
I will then know if the s-7 has lower watt then rated.
I have 2 s-7's on order and I have one of these psu's on order
http://www.onlinecomponents.com/datasheet/hrp60012.aspx?p=37810156
model is Mean Well HRP-600-12
adjusts 10.2 to 13.8 88% eff
I even found the absolutely best possible psu but it cost even more
http://www.onlinecomponents.com/mean-well-hlg600h12a.html?p=45585982
http://www.onlinecomponents.com/datasheet/hlg600h12a.aspx?p=45585982
HLG-600H-12A
note that A means it has a pot adjustment 10.2 to 12.6
this is 92% eff with no fan! but it is 198 usd and is only 480watts
It does allow for a quieter miner but is too pricey.
With the cheap model HRP-600-12 I get up to 636 watts.
I will find a freq that allows me to run at 600 watts and 2400 gh. say 150 vs 300
I will test it with the evga 1600 p2 making sure I am doing around 600 watts I will remove it
I will then use the meanwell and once it fires up at freq 150 2400gh 600 watts 12 volts.
I will back the pot down to 10.8 we should get a good watt drop off and the machine should run well. maybe 500 watts for 2400 gh
I will then know if the s-7 has lower watt then rated.
Quote
Most of PSU has "fine tune" voltage potentiometer
Not from what I've seen of most recent designs. It's quite common of late to have no pot to adjust voltage at all.
Ok so I guess this one could be better.
http://www.ebay.com/itm/DC-DC-Boost-Converter-Adjustable-Step-Up-Step-Down-Power-Apply-Module-High-Power-/400765676880?var=&hash=item5d4f7eed50
Phil do you have any update ?
http://www.ebay.com/itm/DC-DC-Boost-Converter-Adjustable-Step-Up-Step-Down-Power-Apply-Module-High-Power-/400765676880?var=&hash=item5d4f7eed50
Phil do you have any update ?
I now have 2 of these
http://www.amazon.com/gp/product/B00C9UUFHC?
these should work fine see below
Product Description
Size:15A
Parameters:
Input voltage: 4-32V (36V Max)
Output voltage: 1.2-32V (adjustable,default output 5V)
Min voltage difference: 1V
Output current: 0-15A(10A for long-term work) with a cooling fan it should be able to do freq 200 at 10 volts say 110 watts
Input fuse: 15A
Operating temperature: -40°c to +85°c
Working frequency: 150KHz
Conversion efficiency: up to 98%
Module size: 60mm x 51mm x 22mm
Installation: 4x 3mm screws
Application:
1.Its volt convert examples: 12 to 3.3V; 12V to 5V; 24 to 5V; 24V to 12V
2.The board can be used for step-down volt converter such as battery, power supply transformer, DIY adjustable voltage regulated power supply,
24V car laptop power supply, car LED lights power supply,buck volt convert for industrial equipments ,etc
Note:
1.Over-temperature would reduce its output current may need a fan
2.Without input reverse polarity protection(if need, please install diode at input port)
Package Include:
1x DC Buck Converter
Of course I don't have an s-5 and the s-5 sales are done on bitmaintech. I have coins to order one. (coinbase sent them today)
Am I missing something? Maybe you love to make things more difficult than they really are? If you are able to buy and install DC-DC converter, I am sure you can easily adjust your PLATINUM PSU to deliver 10V only. I did 10.6V without opening my Fortron Raider 700W 88% PSUs.
Most of PSU has "fine tune" voltage potentiometer, for exammple Fortron PSU has this accessible through fan grill. If you are not happy with voltage, you can go inside and by using "pencil trick" or changing resistor you can do more. Lowest voltage is limited by UVP which is different on each PSU, but you can easily overcome even this by cutting UVP line.
I also did the trick for server DPS-2000BB which works stable at 10.7V at PSU side, so S5 supply voltage can be around 10.3-10.5V which is good enough for 0.33J/GHs and very little effort.
so this should have a pot to go to 10.8?
http://www.newegg.com/Product/Product.aspx?Item=N82E16817104181&cm_re=fortron_raider-_-17-104-181-_-Product
can't find a 700 watt
I have this one in my house:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817104167&cm_re=fsp_group-_-17-104-167-_-Product
I could look for a pot to lower it a bit.
Am I missing something? Maybe you love to make things more difficult than they really are? If you are able to buy and install DC-DC converter, I am sure you can easily adjust your PLATINUM PSU to deliver 10V only. I did 10.6V without opening my Fortron Raider 700W 88% PSUs.
Most of PSU has "fine tune" voltage potentiometer, for exammple Fortron PSU has this accessible through fan grill. If you are not happy with voltage, you can go inside and by using "pencil trick" or changing resistor you can do more. Lowest voltage is limited by UVP which is different on each PSU, but you can easily overcome even this by cutting UVP line.
I also did the trick for server DPS-2000BB which works stable at 10.7V at PSU side, so S5 supply voltage can be around 10.3-10.5V which is good enough for 0.33J/GHs and very little effort.
Most of PSU has "fine tune" voltage potentiometer, for exammple Fortron PSU has this accessible through fan grill. If you are not happy with voltage, you can go inside and by using "pencil trick" or changing resistor you can do more. Lowest voltage is limited by UVP which is different on each PSU, but you can easily overcome even this by cutting UVP line.
I also did the trick for server DPS-2000BB which works stable at 10.7V at PSU side, so S5 supply voltage can be around 10.3-10.5V which is good enough for 0.33J/GHs and very little effort.
I don't think any of us are trying to make things difficult, my favoured solution would be to adjust down one of my server supplies. However I have 3 different ones, none of which have any adjustment pots, and online I can find no mention of how to adjust them. It would be great if you could list the suppliies you have been able to adjust, how you did it and the voltage you were able to get down to? Ideally we need to get to 9V, however even 11v - 10V would be of use in the short term.
Rich
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