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Author Topic: Swedish ASIC miner company kncminer.com  (Read 3012877 times)
WastedLTC
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October 11, 2013, 05:36:53 PM
 #15001

my home unit dropped from 540ish to 400 yesterday afternoon.  I did try rebooting yesterday also taking case off and adding fan but that didn't change anything.  This morning I did a hard reset (hold reset for 5 seconds) and the miner is back above 530 since.

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October 11, 2013, 05:39:19 PM
 #15002

Hint: Jupiter owners should raise their diff to over 400... it will run faster
there is a "sweetspot....   find it.


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October 11, 2013, 05:48:44 PM
 #15003

W. T. F.?

This is running 0.93...umm help!?

turn off the power, open the case, reconnect the cables
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October 11, 2013, 05:52:25 PM
 #15004

The trick is for what, just testing?  No matter what else that wire pair does, it tells the power supply that a motherboard is connected.  There is no motherboard connected to the motherboard connector when that wire pair is jumped.

There is no need for a motherboard to be connected.   The power supply turns on the when voltage on that pin is low and it turns off when the voltage on that pin is high.  A motherboard, switch, or paperclip all do the same thing they connect the power-on pin to ground which pulls the voltage low.  When the power supply is on (plugged in and any hardwired power switch is turned on) it monitors that pin and supplies continual power to the 5VSB rail.  When it goes low it "turns on" = supplies power to the other rails, and when it goes high it "turns off" = disconnects power to the other rails.



Well, if the exploding caps are caused by voltage buildup on disconnected leads after the miner is disconnected, even with the power supply off, the voltage buildup due to voltage memory of the capacitors, voltage buildup that the power supply designers decided would be drained by the motherboard, then the jumper is signaling a condition, motherboard connected, that does not exist.



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October 11, 2013, 05:55:03 PM
 #15005

also...  runnning the right diff is important, slush's pool has (varidiff), which auto-tunes to your asics.
runing your machine on slush's pool for a few hrs will give you a good idea where to set it.
my saturn has been running @ 260-300+ solid now on slush for the past 18 hours since update to 0.94.... of course it does dip down during flushwork...  for a few seconds.


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October 11, 2013, 05:56:05 PM
 #15006



I bought this (sry for bad pic)
I didnt take much notice at the time, but the jumper is set to pin 4 and pin 6 unlike the setup suggested in the manual of pin 4 and 5
I also have the 8vrm boards and the 6 connection controller board



I bought that too. Is there something wrong with the configuration? Should i change the pins? Do you have problems with yours?
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October 11, 2013, 05:56:25 PM
 #15007

Hint: Jupiter owners should raise their diff to over 400... it will run faster
there is a "sweetspot....   find it.

Good post explaining this a little.
https://bitcointalk.org/index.php?topic=274023.0
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October 11, 2013, 06:01:37 PM
 #15008

Hint: Jupiter owners should raise their diff to over 400... it will run faster
there is a "sweetspot....   find it.

I can confirm this. For a Saturn 128 was not enough, 256 gave better performance.
I did not try other values, did not even know that other values than 2^x would be OK.

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October 11, 2013, 06:03:03 PM
 #15009

And here is a tip for everyone.  You know those two pins you jump to make the PSU work?  Do you know what those are used for?  

When you press the OFF switch your motherboard opens those two pins, telling the PSU to power everything down safely.  That is the only correct way to shut a system down - pull the jumper, then power off the PSU.  

If you just flip the PSU switch off, you leave a "whole lot of amerage" suddenly looking for the quickest way to get home.  And electrons aren't fussy, if they can find a shorter path across a component instead of thru it, they'll use that.  If there are unseen micro droplets of solder on the solder mask that present a shorter path, they'll use that path, carbonizing the solder mask and making it an even BETTER shortcut - resulting in nasty smelling smoke and burned solder mask...

Just flipping the PSU switch to off might not break anything the first time or even 100th time you do it, but eventually you'll pay the price, and the magic smoke gets out.  There's a very valid reason why you don't just turn off your computer by yanking the plug out of the wall socket - and flipping the PSU switch is the equivalent of doing that.  Do that to your desktop computer a few times and see how well it runs as a result...

+1

I, for one, would like to see that shown experimentally.  I personally believe there is no fault in pulling the plug.

More accurately, I believe there is no fault in pulling the plug with the miner attached to the power supply.

Still, that doesn't have a bearing on potential buildup on the power supply lines after disconnecting from the miner, plugged in with switch off or unplugged from the wall with power supply switch on.  The possible problem would be the power supply outputs looking at a open given that the leads would be unplugged from the miner.  The longer unplugged the higher the potential potential buildup. KnC does not know the design of every model of every power supply manufactured.  If a power supply had been powered on for hours or days the potential for voltage potential buildup on the filter capacitors while leads are disconnected may very well exist in some miners.
 In any case, I have two 12 volt fans here I bought to mount on a Blade but difficulty made me decide that it can't pay itself off in a reasonable period.  So, those two fans are going on to exhaust the Mercury, which should have no problem with heat unless I buy modules to upgrade to Saturn then Jupiter, if possible and cost effective.  These fans will always be plugged in first and then the miner, draining off any potential before firing up the supply - and the supply will have been shut down via an external power strip switch and back on the same way.

soy




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October 11, 2013, 06:06:01 PM
 #15010

Well, if the exploding caps are caused by voltage buildup on disconnected leads after the miner is disconnected, even with the power supply off, the voltage buildup due to voltage memory of the capacitors, voltage buildup that the power supply designers decided would be drained by the motherboard, then the jumper is signaling a condition, motherboard connected, that does not exist.

The jumper isn't signalling a motherboard is connected it is signalling the power supply should supply power to the rails.

Overvoltage into a motherboard is just as bad as overvoltage into any other device.  You are replacing one device which will be destroyed by overvoltage with another device which will be destroyed by overvoltage.  Motherboards contain filtering capacitors on their input voltage leads, just like mining boards do, just like GPU do, just like just about every electronic device ever made does.

Any regulating powersupply is designed to do exactly that.  The sole purpose of the power supply is to ensure that the output remains within a range (usually <3%) around 12V nominal.  Please show me in the ATX power spec where a power supply is suppose to shunt overvoltage into the ATX connector.  Please show me in the ATX spec where a motherboard (a device vulernable to overvoltage) is designed to be the dump for excessively high voltage.

It is complete and utter nonsense.  No power supply is designed to dump dangerous overvoltage into the ATX connector to let the motherboard "handle it".  What would be the point?  The POWER SUPPLY is the place to regulate voltage.  If there is excessive voltage it is the responsibility of the powersupply to either regulate it or disconnect the load (connected devices).   Yes power supplies contain overvoltage, overcurrent, and overheat protection circuits.   The powersupply (not the motherboard) monitors the voltage, current, and its internal temp and the powersupply not the motherboard kill the current if it is out of spec.     If the motherboard was going to regulate the voltage then there would be no need for a power supply you could just connect your power cable directly into the motherboard.

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October 11, 2013, 06:06:18 PM
 #15011



I bought this (sry for bad pic)
I didnt take much notice at the time, but the jumper is set to pin 4 and pin 6 unlike the setup suggested in the manual of pin 4 and 5
I also have the 8vrm boards and the 6 connection controller board

http://thumbs4.ebaystatic.com/d/l225/m/mgjVeAWKwqzEQE7SmKpr4Jg.jpg[/img]

I bought that too. Is there something wrong with the configuration? Should i change the pins? Do you have problems with yours?

There is nothing wrong with that jumper, the pinout looks to be correct.  Its not as pretty or as functional as mine but hey.  Wink

Tired of substandard power distribution in your ASIC setup???   Chris' Custom Cablez will get you sorted out right!  No job too hard so PM me for a quote
Check my products or ask a question here: https://bitcointalk.org/index.php?topic=74397.0
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October 11, 2013, 06:12:10 PM
 #15012

Well, if the exploding caps are caused by voltage buildup on disconnected leads after the miner is disconnected, even with the power supply off, the voltage buildup due to voltage memory of the capacitors, voltage buildup that the power supply designers decided would be drained by the motherboard, then the jumper is signaling a condition, motherboard connected, that does not exist.

Where would the overvoltage go in the motherboard.  You are replacing one device destroyed by overvoltage with another device destoyed by overvoltage.  Motherboards contain filtering capacitors on their input voltage leads, just like mining boards do, just like GPU do, just like just about every electronic device ever made does.

Any regulating powersupply does exactly that REGULATE the voltage.  The sole purpose of the power supply is to ensure that the output remains within a range (usually <3%) around 12V nominal.  

No power supply is designed to dump dangerous overvoltage into the ATX connector to let the motherboard "handle it".  What would be the point.  The POWER SUPPLY is the place to regulate voltage.  If the motherboard was going to regulate the voltage then there would be no need for a power supply you could just connect your power cable directly into the motherboard.




The motherboard isn't expected to be normally unplugged.  The voltage wouldn't build up with the motherboard connected, instead the capacitors, filter capacitors, are discharged thru the motherboard.  No buildup.

Looking at the switching supplies recently that are used in USB hubs, switching supplies' voltage is regulated while the circuit is a "current mode" device".  The flow of current allows the voltage to be accurately assessed and regulated.  When the switching supply is looking at an open it may not actually measure or control the voltage.

soy



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operador
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October 11, 2013, 06:16:44 PM
 #15013

FYI, my Jupiter day 1 customer 1-500 is running hosted since 2 days now at an underwhelming 100 GH/s average and my order still says PAID, never went to "processing" or anything else.
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October 11, 2013, 06:17:38 PM
 #15014

The motherboard isn't expected to be normally unplugged.  The voltage wouldn't build up with the motherboard connected, instead the capacitors, filter capacitors, are discharged thru the motherboard.  No buildup.

Now you are just going round and round in circles.  A miner isn't normally unplugged either.  However both a routinely are connected and disconnected over the lifecycle of the device and a powersupply needs to handle that.  It is the sole purpose of a regulated power supply.  It is what they get paid to do.

If the scenario that disconnecting and reconnecting a mining board would allow overvoltage to occur the same would happen when disconnecting and connecting any powered device.  People do upgrade computers you know.   If the bogus scenario you believe was true then a high portion of motherboard upgrades would result in destroyed motherboards.  Of course that doesn't happen because power supplies are designed to regulate the voltage.  The power supply has both a power-on and power-good signal.  I doesn't energize the output rails until it verifies the voltage is regulated.   There never is a scenario where a power supply lacks an active circuit.  It has control of the input power and the ability to power internal circuits for the sole purpose of continually monitoring and regulating the power output.
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October 11, 2013, 06:19:11 PM
 #15015

Order 29XX, Jupiter
Paid June 28
Changed status from "Paid" to "In progress"

35xx in progress too.  Seems they're moving at a good pace now.
Are either of you hosted or are you both shipping?

Shipping.
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October 11, 2013, 06:28:03 PM
 #15016

The motherboard isn't expected to be normally unplugged.  The voltage wouldn't build up with the motherboard connected, instead the capacitors, filter capacitors, are discharged thru the motherboard.  No buildup.

Now you are just going round and round in circles.  A miner isn't normally unplugged either.  However both a routinely are connected and disconnected over the lifecycle of the device and a powersupply needs to handle that.  It is the sole purpose of a regulated power supply.  It is what they get paid to do.

If the scenario that disconnecting and reconnecting a mining board would allow overvoltage to occur the same would happen when disconnecting and connecting any powered device.  People do upgrade computers you know.   If the bogus scenario you believe was true then a high portion of motherboard upgrades would result in destroyed motherboards.  Of course that doesn't happen because power supplies are designed to regulate the voltage.  The power supply has both a power-on and power-good signal.  I doesn't energize the output rails until it verifies the voltage is regulated.   There never is a scenario where a power supply lacks an active circuit.  It has control of the input power and the ability to power internal circuits for the sole purpose of continually monitoring and regulating the power output.

Not all computer switching supplies are without capacitor bleed down resistors.  The power supplies in question here are quite powerful - not your everyday supply.

When you disconnect a motherboard, do you also disconnect all drives, fans, every power supply lead out of the power supply?  Sometimes, maybe.  Usually no.

Mine is a supposition.  This is a somewhat unique application.


(current mode, current mode, current mode, current mode)



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October 11, 2013, 06:31:11 PM
 #15017

Maybe this whole "PSU zapping the machine" thing can also explain why the SD card on my Bitfury rig scrambles every time I do a power cycle.
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October 11, 2013, 06:32:08 PM
 #15018

Probably a stupid question:
Is anyone's Jupiter actually working reliably at 450+GH/s?

After some more fiddling and letting it run I seem to be averaging close to 500 steady for now.  Thinking ill do like other and buy some cheapo fans for the top of the open case.
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October 11, 2013, 06:36:01 PM
 #15019



I bought this (sry for bad pic)
I didnt take much notice at the time, but the jumper is set to pin 4 and pin 6 unlike the setup suggested in the manual of pin 4 and 5
I also have the 8vrm boards and the 6 connection controller board



I bought that too. Is there something wrong with the configuration? Should i change the pins? Do you have problems with yours?
I bought the same and it's worked fine for me so far.
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October 11, 2013, 06:38:51 PM
 #15020

FYI, my Jupiter day 1 customer 1-500 is running hosted since 2 days now at an underwhelming 100 GH/s average and ...

Same problem here with a Saturn:



I created a topic at the KnC forum.

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