Antminer S5 - Underclock - Undervolt - Best J/GH - page 13.

RadekG

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Quote from: philipma1957 on August 21, 2015, 08:44:52 AM

Quote from: valkir on August 20, 2015, 06:18:20 AM

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.

philipma1957

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Quote from: numnutz2009 on August 24, 2015, 07:48:40 AM

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?

wicks

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

QuintLeo

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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).

RichBC

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Quote from: numnutz2009 on August 24, 2015, 07:48:40 AM

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

numnutz2009

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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.

QuintLeo

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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.

RichBC

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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

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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....

philipma1957

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Quote from: RichBC on August 23, 2015, 10:41:24 AM

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?

RichBC

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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

QuintLeo

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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.

philipma1957

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'The right to privacy matters'

Quote from: valkir on August 20, 2015, 06:18:20 AM

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)

valkir

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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 ?

RichBC

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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.

QuintLeo

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

valkir

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Activity: 1484

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Phil you can adjust the volt on your ? Can you give us a link to find it? Grin

Thanks

Edit: could that work https://abra-electronics.com/power-supplies-transformers-adapters/enclosed-switching-ps-circuit-test/psf150-9-ac-dc-power-supply-150w-9vdc-17a-psf150-9.html

VirosaGITS

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Quote from: RichBC on August 19, 2015, 02:52:49 PM

A DC-DC converter is one option and probably the easiest way to drop the voltage as you can use your existing PSU. The cost is the price of the converter and the added inefficiency. A better solution would be able to adjust the voltage of the main PSU down while retaining it's efficiency. Weather that is possible or not I do not know?

Another approach I am considering, but not for the faint hearted, is to patch additional BM1384 chip pairs from another S5 hash board into the string to reduce the voltage on each stage, not very practical to replicate but interesting as a one off.

With 2 S5's, you have 4 hash boards, so you take one third of the 4th board( 5 Chip pairs) and patch them into the other 3 boards increasing the chip pairs from 15 to 20 and so reducing the core voltage on each chip from 0.8V to 0.6v. Easier said than done, but on the list of possibles.

Rich

Edit

Yes that would work, a bit expensive & not adjustable. The ones that Phil identified earlier in the thread are probably a better bet.

Lmao. That's a bit crazy. But maybe you could have some fun with that. Let me/us know if you try it. Hopefully the firmware won't mind handling weird hashboards with 40 chips instead of 30. I'm sure some people would be interested in such miner, i would but yeah xD

RichBC

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A DC-DC converter is one option and probably the easiest way to drop the voltage as you can use your existing PSU. The cost is the price of the converter and the added inefficiency. A better solution would be able to adjust the voltage of the main PSU down while retaining it's efficiency. Weather that is possible or not I do not know?

Another approach I am considering, but not for the faint hearted, is to patch additional BM1384 chip pairs from another S5 hash board into the string to reduce the voltage on each stage, not very practical to replicate but interesting as a one off.

With 2 S5's, you have 4 hash boards, so you take one third of the 4th board( 5 Chip pairs) and patch them into the other 3 boards increasing the chip pairs from 15 to 20 and so reducing the core voltage on each chip from 0.8V to 0.6v. Easier said than done, but on the list of possibles.

Rich

Edit

Yes that would work, a bit expensive & not adjustable. The ones that Phil identified earlier in the thread are probably a better bet.

valkir

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Nice topic. So basically you use a dc converter to drop voltage on the in power of the S5 ??

Nice cant wait to see the final result! Grin

Edit: will that work ?? http://www.amazon.com/SMAKN%C2%AE-Converter-Power-Supply-Module/dp/B00N3OAV2W

Topic: Antminer S5 - Underclock - Undervolt - Best J/GH - page 13. (Read 31123 times)