Final results for Optimizer 4k break out board testing

[philipma1957]

Okay  I had  a lot of other stuff on my plate and did not get to finalize my tests Until today.

First  this is the original thread and it was for the 2k boards.


 https://bitcointalk.org/index.php?topic=1373092.msg16444623#msg16444623


here is Nick's website.

http://www.price-technology.com/dps2000bb-power-breakout-board---4k-variant.html

[TheYankeesWin!]

I know you tested his board  in a weird manner, but I forgot what you did..

[philipma1957]

I know you tested his board  in a weird manner, but I forgot what you did..

You are correct.  The 4k boards need two of the correct psu's  the dps-2000 will work and the dps-2500 will work.

My first set of tests  were done with a  good dps-2500 and a dead dps-2500 that I shorted by  accident a month before I got Nick's board to test.

Why do a fucked up test?  Well  when you run high amp gear a psu dying or tripping its breaker may happen.  So  if your board is facing this issue all power will go in one and the load is more stress ful.

Depending on how much you draw  that second psu may stay on and too much current flows into the board.

I am happy to say Nicks board ran 2 s9's pulling 2400 dc from one dps-2500  without a meltdown or browning of sockets.  Since the board is rated for 4000 watts dc  using 2 connections  and it did 2400 watts with one connection.  I can say  it is overspec which is nice.

The one issue that happen with this test was  the board would not turn off with the small switch  Nick told me the proto type switch was parallel  hooked up and he adjusted his sale items to prevent this from happening .

That is the one thing I found wrong with all tests.

My second set of tests was held back be the Hurricane  which got the solar array a bit wet.  Nicks board got some water on it but continued to run without any issues at all. More then I can say for my EVGA 750 t2 and my biostar z170 mobo (but that is eth coin not  BTC)

I finally redesigned the solar array to be water proofed and sound proofed. See this thread.

https://bitcointalk.org/index.php?topic=1650756.0


I then did my testing with  2 good dps-2000 psu and two  s9's pulling 2400 watts.
The one full drop was when I waterproof/soundproof the array.
flawless the rest of the time.  kano had small glitches but the gear keeps working fine







the new board hooked up to two s9s'





12.2 volts at the board turns into 12.1 volts at the s9 jack




the 19 amps at the pdu are 1 4k board from Nick using a pair of dps-2000 psus runnng 2 s9's
and 1 2k board from finksy/j4bberwock running an s-9 with a dps-2000 psu
and 1 2k board from nick running an s-7 with a dps-1600 psu

[Finksy]

Phil,

have you tried running the single DPS-2500 and 2x S9's through one of the J4bberwock DPS-4K boards?

[philipma1957]

Phil,

have you tried running the single DPS-2500 and 2x S9's through one of the J4bberwock DPS-4K boards?

yes  and it does get a bit warmer to the touch.

what does it all mean.

If I was doing a big farm  I would not use dps-2500 with  the J4bberwock boards.

If I was doing a big farm  with the J4bberwock boards  I would use  dps-2000 psus.



The optimizer board is higher quality but costs more.

For 2 dps-2500 it is the better choice-------------------------------------------------------------note  you can pull close to 4600 watts will do 3 s9s

For 2 dps-2000  it will take time for the optimizer to pay for itself.   So it is kind of a tie-----note  this is 4k watts just gets 3 s9s

For 2 dps-1600  the j4bberwock is better  ------------------------------------------------------- note this is 3k watts  or  two s9's

I do believe price is 77 for optimizer  and    46 for j4bberwock. is the 46 correct?

If I were to run a 50 or more s9 farm and commit  to long term  mining  I would prefer the dps2500 psus and  optimizer 4k boards.

Not a knock against the j4bberwock board.

I would use  the new plate you had made to join the psus.

Now we are talking a issue  that is not too  big a worry if you went with dps-2000 psus.

but  if you had 2 dps-2500's driving  2 s9's  and only one psu was working  you could get a meltdown with  the j4bberwock board.



I know the dps-2500  does 2 or 3 % better then the dps-2000  and has more overhead    it can do 2300 watts dc.


Now to be more clear here. The dps-2000 poses no issue in the one dead one live psu since it would shut down under a two s9 load of 2300 watts.

So the issue of one dead one live psu hurting a j4bberwock board only happens if you use two dps-2500 psus.
With two s9s.

[Finksy]

yes  and it does get a bit warmer to the touch.

Doesn't sound very concerning as an absolute worst case scenario.

but  if you had 2 dps-2500's driving  2 s9's  and only one psu was working  you could get a meltdown with  the j4bberwock board.

A lot of things "could" happen with mining, but this I am very doubtful of. Did you pull temperature readings after the same time period off each board?  Also, I had a J4bber 4K board with 2x DPS-2000's running 3x S7's and an S5 for months.  No yellowed plugs, no drama, nothing.  So running 3x S9's on any 4K setup, even with DPS-2000BB's is not problematic for either board if it's worth anything.

I think I'll test this test myself with some S7's at the same power consumption as S9's.  So to summarize, your test consisted of running 2x S9's off a 4k Board with only a single DPS-2500 powered, right?  And your measure of success was hashrate at the pool and voltage at the plug?

[philipma1957]

yes  and it does get a bit warmer to the touch.

Doesn't sound very concerning as an absolute worst case scenario.

but  if you had 2 dps-2500's driving  2 s9's  and only one psu was working  you could get a meltdown with  the j4bberwock board.

A lot of things "could" happen with mining, but this I am very doubtful of. Did you pull temperature readings after the same time period off each board?  Also, I had a J4bber 4K board with 2x DPS-2000's running 3x S7's and an S5 for months.  No yellowed plugs, no drama, nothing.  So running 3x S9's on any 4K setup, even with DPS-2000BB's is not problematic for either board if it's worth anything.

I think I'll test this test myself with some S7's at the same power consumption as S9's.  So to summarize, your test consisted of running 2x S9's off a 4k Board with only a single DPS-2500 powered, right?  And your measure of success was hashrate at the pool and voltage at the plug?

and temps on the 4k board are lower  on optimizers board then yours.  which is normal since his has more copper.

It does not make the j4bberwock board a bad board it just confirms that his board is more heavy duty then your board.

His board costs more then your board.  but  the bottom line in mining is safety + profit.

I can think of setups that I would advise your board over his and I can think of setups where his board is better then yours.

Did not surprise me that this was going to be the result of the tests.

But 50 dps-2500 as pairs  running  2 s9s' each with his board

  is better then  50 dps-2500  running 2 s9s each with your board due to the safety of one psu dying being possible. Since you are running lots of psus.

If the psu dies the single psu can carry the   the load of 2  s9s.  and the optimizer board would run cooler then yours.



   

      Look for me  I may just get out of mining unless  a more reliable miner comes along. the s9  is not reliable enough .  I have shrunk  from 6 s9's to 3 s9s.  I am still waiting on repairs from bitmainwarranty.  I am pretty much disgusted with the btc mining end.
All subject to change if something comes out that does not breakdown.

   If some one reads this and decided to go all dps-2500  in his  large mine dual psu setup  he should use  optimizers.
   If some one reads this and decides to go all dps-2000  in his large mine dual psu setup a push.
   If some one reads this and decides to go all dps-1600   in his dual psu setup he should use j4bberwock.

This is pretty much  what I expected going into this.
I stand by the tests and picks for both boards.

[Finksy]

That's an interesting summary. I'm sure you are right in that the board temps on the optimizer would be lower than the board temps on the J4bberwock 4K board under load due to the extra copper. I just haven't had experience or reports of even a single yellowed plug on the 4K boards even under heavy loads (if anyone has one please post up!), and only occasionally on high-draw high-ambient 2880W boards as yours did with your modified cooling fans in a USPS shipping box and mine running single cables to Neptune cubes (which were prone to starting fires for their inadequate design).  I'm going to see if I can melt a 4K board with a single DPS-2500 loaded as high as I can before hitting thermal shut-down to see if there really is a safe limit on them, because my experience is there is no safety concern with them whatsoever, and the hundreds (or thousands?) of customers with 4K boards in their hands from myself and J4bberwock would confirm that.  Your report that it felt " a bit warmer to the touch." in this worst-case-scenario would seem to agree with that as well, and yet you still seem inclined to push the Optimizer boards for "safety".  To each their own, it is a free market, but I feel that you are misleading the mining population with your assessment.  Do you have a sales, commission or referral deal with Optimizer by chance?

[HerbPean]

That's an interesting summary. I'm sure you are right in that the board temps on the optimizer would be lower than the board temps on the J4bberwock 4K board under load due to the extra copper. I just haven't had experience or reports of even a single yellowed plug on the 4K boards even under heavy loads (if anyone has one please post up!), and only occasionally on high-draw high-ambient 2880W boards as yours did with your modified cooling fans in a USPS shipping box and mine running single cables to Neptune cubes (which were prone to starting fires for their inadequate design).  I'm going to see if I can melt a 4K board with a single DPS-2500 loaded as high as I can before hitting thermal shut-down to see if there really is a safe limit on them, because my experience is there is no safety concern with them whatsoever, and the hundreds (or thousands?) of customers with 4K boards in their hands from myself and J4bberwock would confirm that.  Your report that it felt " a bit warmer to the touch." in this worst-case-scenario would seem to agree with that as well, and yet you still seem inclined to push the Optimizer boards for "safety".  To each their own, it is a free market, but I feel that you are misleading the mining population with your assessment.  Do you have a sales, commission or referral deal with Optimizer by chance?

I have one, replaced about 5 cables (Only the connector board side was over-heating, nothing miner side). I have now a constant airflow on them, just to be sure.

My room temperature was high and a load of about 80%.

I think the room temperature during the summer did not help.