Antminer S5 - Underclock - Undervolt - Best J/GH

[QuintLeo]

valkir, that 9V supply you linked would work - but what's the efficiency of it?

[RichBC]

Efficiency is one issue, but you also really need an adjustable supply dependant on what frequency you want to run at. Ideally 9V to 12V, but 9V to 11V would be ok as you can use existing supplies for 12V.

[valkir]

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 ?

[philipma1957]

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 ?

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)

[QuintLeo]

Finally did some digging, and found 2 better PS options.

 Both are specified to adjust down to at least 10V, and will probably go somewhat before that (9.0v probably not but 9.5 perhaps).
 Both are fairly efficient (88% ballpark) - not gold but close, as good or better than running a 95% buck that might not handle the power load from a gold ATX PS and tossup with running a 95% buck from a platinum ATX.

https://e4btc.com/sea-sonic-pf-series-sse-3201pf-12
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2172084_-1

 I wish I could find a US seller for the Seasonic.

 Might need 2 (1 per side) if you don't undervolt a LOT.
 Might get away with one for both sides of an S5 at minimum voltage setting on either of these.


 Jameco showed some lower-price lower-power varients on that second one, a couple of them were also specced at 88% efficient. 20 amp range would probably be plenty for one side at a time with enough of an undervolt.

[RichBC]

Nice find on the PSU's, much preferable to an additional Buck Converter. As I am in the UK I will take a close look at the spec on the Sea Sonic one and may give one a try. Can't see where it says 10V, can you point me at that bit?

Rich

[philipma1957]

Nice find on the PSU's, much preferable to an additional Buck Converter. As I am in the UK I will take a close look at the spec on the Sea Sonic one and may give one a try. Can't see where it says 10V, can you point me at that bit?

Rich

according to this pdf he is wrong


http://www.jameco.com/Jameco/Products/ProdDS/2188422.pdf



it lists the range for the:


 SSE-3201 PF-12  AS 10.8 TO 13.2     >>>   320.4 WATTS
 SSE-4501 PF-12  AS 10.8 TO 13.2     >>>   450.0 WATTS


TRY http://www.ebay.co.uk/itm/Sea-Sonic-Electronics-SEASONIC-SSE-3201PF-12-320W-Telekom-Full-R-SSE-3201PF-12-/400876113708?

[QuintLeo]

Thought they both specced to go down to 10 or 10.2 volts, guess I misread it. I suspect they'll both get real close to 10V though, the "spec" adjustment range usually is noticeably narrower than the real range.

 Be nice if someone could find some similar PS with 90+ efficiency, though - as long as the price isn't a LOT higher.

 8-)


 I saw the SSE 4501, but Jameco wants somethign like twice as much for those. Almost certain you could get away with one of them per S5 even at MILD undervolt, but not as much margin and the price doesn't make it worth it unless you're VERY VERY space limited.

 I do like the 60mm fan on the Seasonics, should be quieter than the more common 40mm screechers....

[RichBC]

10.8V - 13.2V is quite precise so would not expect to see anything better than that. It would be useful to be able to get down to 10.8V but if I am going to spend the money on a new supply I want to be able to get down to 9V to keep making money as long as possible, so will keep looking.

Rich

[QuintLeo]

One of the other PS of the non-Seasonic maker on the Jameco page was also specced 10.8-13.something, but on IT'S data sheet it showed a "typical performance" page where the PS would actually adjust below 10V.

 The Seasonic unit might not "exceed" it's specs by that much though.



 On the other hand, it's a lot less of a risk taking one of these $60ish PS and digging into one to see if you can modify it minimally to extend the lower end of that adjustment range.

[numnutz2009]

so im reading this thread and while i didnt read all the posts i did see someone getting mad about what seemed like money loss with equipment being purchased and not trusting what this guy says but why wouldnt he/she just buy a server psu that can have a voltage range from 9v-15.8v? thats what i did and i have been undervolting my s5's for months now....the only diff for me is the machine will not start hashing unless the voltage is 12v. once the frequency is set and the machine is booted i have to turn the pot added to my psu's to lower the voltage to match whatever frequency i choose. if i go too far the machine gets more hw errors if i hit the number needed everything is fine.

[RichBC]

so im reading this thread and while i didnt read all the posts i did see someone getting mad about what seemed like money loss with equipment being purchased and not trusting what this guy says but why wouldnt he/she just buy a server psu that can have a voltage range from 9v-15.8v? thats what i did and i have been undervolting my s5's for months now....the only diff for me is the machine will not start hashing unless the voltage is 12v. once the frequency is set and the machine is booted i have to turn the pot added to my psu's to lower the voltage to match whatever frequency i choose. if i go too far the machine gets more hw errors if i hit the number needed everything is fine.

I assume you have one of the earlier Hash boards, would be good to know the version? Also would be great to know the make & model of the Server PSU that can be adjusted from 9V - 15.8V? I have three deiffernt Server PSU and none of them have I found a way of getting that sort of adjustment?

Thanks Rich

[QuintLeo]

It's not so much that folks are mad, it's more that we want to be able to undervolt our existing S5 units *IF WE CAN* to extend how long we'll be able to mine profitably with them and give a better chance of a positive RoI on them (or give more OF a positive RoI on them if we do manage or already have managed to attain RoI on them).

[wicks]

Well look at it from my viewpoint.  My power cost is high.

[philipma1957]

so im reading this thread and while i didnt read all the posts i did see someone getting mad about what seemed like money loss with equipment being purchased and not trusting what this guy says but why wouldnt he/she just buy a server psu that can have a voltage range from 9v-15.8v? thats what i did and i have been undervolting my s5's for months now....the only diff for me is the machine will not start hashing unless the voltage is 12v. once the frequency is set and the machine is booted i have to turn the pot added to my psu's to lower the voltage to match whatever frequency i choose. if i go too far the machine gets more hw errors if i hit the number needed everything is fine.

what is the make and model of your server psu?

[RadekG]

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 ?

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.

[RichBC]

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.

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

[philipma1957]

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 ?

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.

[QuintLeo]

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.

[philipma1957]

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.