Overclock/Overvolt the Avalon6 with a DPS-1200FB Made Simple

[kilo17]

So after messing with a bunch of different PSU's and seeing different results on the Avalon6 depending on supplied voltage I decided to try and increase the voltage on the common (and cheap) DPS-1200FB.  There is plenty of info on the net about it which made it simple.

1 - I used a DPS-1200Fb that was already running a miner at 11.9-12 volts by the software and hashing on average around 3300-3400 at best.
2 - I used the same plug, PSU and miner for the testing to eliminate bias.

Here is the PSU



Here are the steps:
1- Remove the 4 top screws on the PSU - the top opens like a book and unhinges at the bottom. Here is what you will see.



2 - Notice the flap in the black liner below the pink tape - I cut it off to expose the 3 pots.   From the view below it is the pot on the right we are interested in.



3 -  It is a single rotation pot and for me turning it to the left (Counterclockwise)  increased the voltage.  The range is suppose to be 11.7-12.7.  Just prior to turning the pot I measured the voltage and it was 12.29 as seen below. About .2 volts below what the software reported.



4 - I measured the distance and drilled a hole in the side to allow easy "tuning".



5 - I then increased the voltage to 12.68.

[1715021479]

1715021479

[1715021479]

1715021479

[1715021479]

1715021479

[kilo17]

BAM - 3800 ghs


Second miner from the bottom-



Here it is later on:

[kilo17]

It is almost 4:00 am here and I gotta sneak a snooze, I will let you know later if it blows up the miner or the PSU 

[philipma1957]

It should run well at 12.6  as I run mine at 12.55 for 20 hours with zero issues.

top screen shot is a dual avalon  they both get over 3900 gh
on finsky's dual 2000=4000 watt psu with high volt setting of 12.55

[sabercatt]

only thing i notice with mine - if there is a problem (too hot, power loss, pool restart) they wont boot at that voltage. if i'm away then they stay off till i return and drop the voltage to restart them.

[philipma1957]

only thing i notice with mine - if there is a problem (too hot, power loss, pool restart) they wont boot at that voltage. if i'm away then they stay off till i return and drop the voltage to restart them.

Mine reboot with 12.55 volt setting.

What psu do you have?  and if there is a power outage does the rasp pi reset.

I get one problem with hard power of then power on the problem is at 11.7 12.2 or 12.5 volts and the rasp pi finds 1 of the 2 avalon's not both.  So I need a software reboot. but I do reboot at 12.55 volts

[sabercatt]

dps-1200fb. no issues with pi's. only once have i had a miner not show up even though it was blue and hashing.

[philipma1957]

dps-1200fb. no issues with pi's. only once have i had a miner not show up even though it was blue and hashing.

okay I just bumped my  dual psu back to 12.55
 see the hash at 3900 plus for each one
see the soft ware sensor at 12.4 and 12.2

the real volts are 12.55.

I have not booted just used the switch on the dual 2000 board from 12.23 to 12.55

I will do a cgminer restart now




and in theory see what happens. and it did restart

two screenshots show it is settling back in.  So I got a restart at 12.55 volts
 my guess is this as to your lack of restart.  the psu needs 5 to 10% higher to restart then settles in a lower draw.

So at 12.5 or 12.6 volts  the psu needs 1300-1400 watts at the start and it can not do it. It lacks the overhead.

My psu needs 2600-2800 at the start  and it has 4000 watt top end so it can do it.  It is simply a case of having the  1200 watt psu at 12.6  if it were a 1500 watt the reserve would be there for the start.

Ac compressor's refrigerator compressor's  use a starter cap for that little bit of kick start juice needed.  My skill set in psu's is not that good to wire in a startup cap.

[sabercatt]

that is certainly a possibility, although most of them wont even attempt to start. they just flashe red and stays at 12.4 or 12.5v. sometimes i wonder if its heat related. If i drop the voltage down to 12.1 or so 50% of the time it will take off on its own. the other 50% i have to unplug the psu, start the miner all the way till hashing and then raise the voltage. And it is certainly different miner to miner. I've tried moving psu's around and trying different things. most of it boils down to differences in the miners more than the psu's. i've got 20 on 3 different types of psu's, but none higher than 1300w, although all running at 240v.  Never any problems while running, most have been up for 6-7 days now since last power issue. It just takes me an hr or two to get them dialed in after such a failure. And mostly getting each miner set up to the voltage it runs best at overclocked without going past where its efficient (which can be a very small window).

[alh]

This is a really great article and discussion. One thing I think that was missing from the outset is that this will only work with an input voltage of 220V. It won't work on 120V (nominal) wall power.

I say this based solely on the label which suggests it won't supply enough DC power when powered from a typical 120V outlet.

Which breakout board are you using on this DPS-1200FB power supply?

[Finksy]

Which breakout board are you using on this DPS-1200FB power supply?

Looks like J4bberwock's common slot breakout board, available on Scott's website: http://holybitcoin.com/product/hp-1200-watt-common-slot-psu-bundle/

[kilo17]

This is a really great article and discussion. One thing I think that was missing from the outset is that this will only work with an input voltage of 220V. It won't work on 120V (nominal) wall power.

I say this based solely on the label which suggests it won't supply enough DC power when powered from a typical 120V outlet.

Which breakout board are you using on this DPS-1200FB power supply?

Mine are all currently running on 120v, including the one that I bumped up the voltage on.

[kilo17]

Which breakout board are you using on this DPS-1200FB power supply?

Looks like J4bberwock's common slot breakout board, available on Scott's website: http://holybitcoin.com/product/hp-1200-watt-common-slot-psu-bundle/

That is correct.

[-droid-]

This is a really great article and discussion. One thing I think that was missing from the outset is that this will only work with an input voltage of 220V. It won't work on 120V (nominal) wall power.

I say this based solely on the label which suggests it won't supply enough DC power when powered from a typical 120V outlet.

Which breakout board are you using on this DPS-1200FB power supply?

Mine are all currently running on 120v, including the one that I bumped up the voltage on.

are you using 2 of these per avalon then?  I dont see how at 900w on 120v you can run one avalon with increased voltage to boot

[kilo17]

This is a really great article and discussion. One thing I think that was missing from the outset is that this will only work with an input voltage of 220V. It won't work on 120V (nominal) wall power.

I say this based solely on the label which suggests it won't supply enough DC power when powered from a typical 120V outlet.

Which breakout board are you using on this DPS-1200FB power supply?

Mine are all currently running on 120v, including the one that I bumped up the voltage on.

are you using 2 of these per avalon then?  I dont see how at 900w on 120v you can run one avalon with increased voltage to boot

I am using 1 of them, I plan on doing it to another tonight and will take pictures of it running.  Also, it will be a good follow up to verify the results.

[-droid-]

This is a really great article and discussion. One thing I think that was missing from the outset is that this will only work with an input voltage of 220V. It won't work on 120V (nominal) wall power.

I say this based solely on the label which suggests it won't supply enough DC power when powered from a typical 120V outlet.

Which breakout board are you using on this DPS-1200FB power supply?

Mine are all currently running on 120v, including the one that I bumped up the voltage on.

are you using 2 of these per avalon then?  I dont see how at 900w on 120v you can run one avalon with increased voltage to boot

I am using 1 of them, I plan on doing it to another tonight and will take pictures of it running.  Also, it will be a good follow up to verify the results.

How is the Avalon getting enough watts? The PSU on 120v maxes at 900w right?

[philipma1957]

This is a really great article and discussion. One thing I think that was missing from the outset is that this will only work with an input voltage of 220V. It won't work on 120V (nominal) wall power.

I say this based solely on the label which suggests it won't supply enough DC power when powered from a typical 120V outlet.

Which breakout board are you using on this DPS-1200FB power supply?

Mine are all currently running on 120v, including the one that I bumped up the voltage on.

are you using 2 of these per avalon then?  I dont see how at 900w on 120v you can run one avalon with increased voltage to boot

I am using 1 of them, I plan on doing it to another tonight and will take pictures of it running.  Also, it will be a good follow up to verify the results.

How is the Avalon getting enough watts? The PSU on 120v maxes at 900w right?

based on his numbers it must do more maybe 1100.  1100 clean watts would give about  3500gh.

[kilo17]

Here are a different miner and PSU.
Picture:
1 - Miner before overvolting - Avalon #3
2 - Miner running "stock"
3 - After overvaulting PSU
4 - Plug measurement
5 - Miner running overvalued
6 - Results after overvolting - Avalon #3

[kilo17]

I have backed the voltage down a tad to about 12.3 (by software) and 12.5 on the PSU and achieve the same hash results and the PSU is much cooler.

[kilo17]

This is a really great article and discussion. One thing I think that was missing from the outset is that this will only work with an input voltage of 220V. It won't work on 120V (nominal) wall power.

I say this based solely on the label which suggests it won't supply enough DC power when powered from a typical 120V outlet.

Which breakout board are you using on this DPS-1200FB power supply?

Mine are all currently running on 120v, including the one that I bumped up the voltage on.

are you using 2 of these per avalon then?  I dont see how at 900w on 120v you can run one avalon with increased voltage to boot

I am using 1 of them, I plan on doing it to another tonight and will take pictures of it running.  Also, it will be a good follow up to verify the results.

How is the Avalon getting enough watts? The PSU on 120v maxes at 900w right?

That is a true statement at "stock" settings but by increasing the voltage it is increasing the wattage I do believe  (watts=volts * amps) on the 12 volt side.  On the wall side it would need to increase the amps since the voltage remains stable at 120