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Author Topic: Swedish ASIC miner company kncminer.com  (Read 3039464 times)
johnny5
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March 15, 2015, 10:11:43 PM
 #39941

Last week, KnC tweeted (https://twitter.com/kncminer/status/575024006312689664) that they are in the process of updating their web presence - implying that the forum will return.

Quote
We're in the process of updating our web presence, if you have a question pls contact r support dep. via kncminer.com

Then again, it seems folly to believe what they tell us.
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March 15, 2015, 10:38:43 PM
Last edit: March 15, 2015, 11:12:07 PM by notthematrix
 #39942

to make it consumer idiot proof it takes a other 3 years what you don't have in bitcoin miner space.

You may think that's normal, but it's not. Bitmain and Spondoolies don't take 3 years to develop good usable products.

true but 4.9th @  3000 watt http://www.spondoolies-tech.com/products/sp31-yukon-shipping-from-stock looks like "older" consumer technology
I run 7.5 th  @ 3720 watt.

https://www.bitmaintech.com/productDetail.htm?pid=00020150303100340162omIT01sg0693
cant get the power specs of this one.

KNC took more risk here by developing a 20 nm chip https://www.cryptocoinsnews.com/ccn-reveals-timeline-kncminers-struggle-20nm-asic-bitcoin-miners/

"My take on this is that most of the" mess ups are over with because a lot of the above revolved around one thing, 20nm chips. The fact that the technology is so new made it so that KnC spent over half a year with their research and development of the Neptunes."

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March 15, 2015, 10:57:33 PM
 #39943

Update from my previous post

It took me a couple of days to finish all of the Bonus Miner's Cubes, but they now all have the Arctic Silver Thermal Adhesive ASTA-7G upgrade. Not having used it before, I did not realize that you had to clamp them down for an hour, so that added a little extra challenge. The pieces I cut off of the E heatsink worked perfectly for the task!

In case anyone else does this the same way, here is some tips.
  • I used a piece of cardboard as a shim on the row of 4, because as some have noticed, the board is bowed due to KnC's "glorious" design. That filled the gap on the center two, then I flattened the ends of the cardboard to fill the slight gap on half of the two end Enzos.
  • The processor's heatsink gets in the way slightly, so position the two side pieces back to the edge of the Enzos (facing you), usually up against the processor's heatsink pipes. That way the clamp holds it down evenly across the width, since your clamp might not be able to go under all the way.
  • Do not over tighten your clamps! I fortunately managed not to kill any of the 48 VRMs that I did. Tighten the row of 4 until you see the case metal bow up close to the fan header's pins. It bends very easily, but it is not permanent. The side ones are much firmer, since the case has the two screw risers on both sides. If you get the clamp on snug to start with, then it should only take about 1 turn to get it tight.
  • Moving at a decent speed, you can apply the adhesive to all 8 in one go before it gets too thick. Basically: Apply, push heatsink on firmly, apply, push heatsink on, etc, etc. Adjust them when you get done and by then, they should be getting firm enough to clamp without them slipping around on you.
  • Use a little lid or dish, with isopropyl alcohol in it, to put the little spreader in when you get done with all 8 VRMs. It makes cleaning it off super easy for the next Cube. You can semi see mine in the corner of the picture.
  • Dole Pineapple cans make decent pedestals. Tongue

The Arctic Silver Adhesive made a nice difference, the best of which was on the stock Speedy fan, which is a 8 to 16C drop over the 3M thermal tape!  Grin Here is the results:

Stock Voltage and Frequency settings:


Stock Voltage with Frequency Overclock:


Max Undervolting and Frequency Overclock:


If you did the math, you might have noticed I said 48 VRMs, aka 6 Cubes. I had bought one spare set of Enzos, which I decided to use on that one anomalously hot Cube/VRM from one of my regular Neptune miners. The one hot VRM was actually shutting down yesterday (+113C), since it has gotten warmer outside and the temps were rising indoors. So here is a nice comparison of a regular Neptune upgraded to Enzos with Arctic Silver:

That is a 8 to 11C drop!  Cool Frankly, this is how they should have been made to begin with.

My last thing to do is to swap that Speedy fan with a BitFenix, for direct comparison.

I am not even going to waste the energy arguing with notthematrix anymore, he makes excuses for criminals, what more is there to say? Some mafia could come out with a miner and he would defend them when the miner burned people's houses down, because they didn't buy mafia style "fire insurance".  Roll Eyes

It is like trying to explain freedom to someone who has lived in extreme oppression their entire lives, it would take a professional a long time. Like one refugee I read about, he actually wanted to go back to his oppressive country, because freedom was "too difficult". Too many people these days have the same problem with companies, making excuses for their unacceptable behavior, because "surely, the company knows best, the problem must be YOU!". I mean come on, when most people can't even acknowledge that iphones, etc, are made by slaves, who so often jump to their deaths that they need "suicide nets" around the buildings, then what hope is there for notthematrix ever understanding KnC's criminality?

KnCMiner Firmware - Mercury/Saturn/Jupiter/Neptune/Titan
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March 15, 2015, 11:17:41 PM
 #39944

Update from my previous post

It took me a couple of days to finish all of the Bonus Miner's Cubes, but they now all have the Arctic Silver Thermal Adhesive ASTA-7G upgrade. Not having used it before, I did not realize that you had to clamp them down for an hour, so that added a little extra challenge. The pieces I cut off of the E heatsink worked perfectly for the task!

In case anyone else does this the same way, here is some tips.
  • I used a piece of cardboard as a shim on the row of 4, because as some have noticed, the board is bowed due to KnC's "glorious" design. That filled the gap on the center two, then I flattened the ends of the cardboard to fill the slight gap on half of the two end Enzos.
  • The processor's heatsink gets in the way slightly, so position the two side pieces back to the edge of the Enzos (facing you), usually up against the processor's heatsink pipes. That way the clamp holds it down evenly across the width, since your clamp might not be able to go under all the way.
  • Do not over tighten your clamps! I fortunately managed not to kill any of the 48 VRMs that I did. Tighten the row of 4 until you see the case metal bow up close to the fan header's pins. It bends very easily, but it is not permanent. The side ones are much firmer, since the case has the two screw risers on both sides. If you get the clamp on snug to start with, then it should only take about 1 turn to get it tight.
  • Moving at a decent speed, you can apply the adhesive to all 8 in one go before it gets too thick. Basically: Apply, push heatsink on firmly, apply, push heatsink on, etc, etc. Adjust them when you get done and by then, they should be getting firm enough to clamp without them slipping around on you.
  • Use a little lid or dish, with isopropyl alcohol in it, to put the little spreader in when you get done with all 8 VRMs. It makes cleaning it off super easy for the next Cube. You can semi see mine in the corner of the picture.
  • Dole Pineapple cans make decent pedestals. Tongue

The Arctic Silver Adhesive made a nice difference, the best of which was on the stock Speedy fan, which is a 8 to 16C drop over the 3M thermal tape!  Grin Here is the results:

Stock Voltage and Frequency settings:


Stock Voltage with Frequency Overclock:


Max Undervolting and Frequency Overclock:


If you did the math, you might have noticed I said 48 VRMs, aka 6 Cubes. I had bought one spare set of Enzos, which I decided to use on that one anomalously hot Cube/VRM from one of my regular Neptune miners. The one hot VRM was actually shutting down yesterday (+113C), since it has gotten warmer outside and the temps were rising indoors. So here is a nice comparison of a regular Neptune upgraded to Enzos with Arctic Silver:

That is a 8 to 11C drop!  Cool Frankly, this is how they should have been made to begin with.

My last thing to do is to swap that Speedy fan with a BitFenix, for direct comparison.

I am not even going to waste the energy arguing with notthematrix anymore, he makes excuses for criminals, what more is there to say? Some mafia could come out with a miner and he would defend them when the miner burned people's houses down, because they didn't buy mafia style "fire insurance".  Roll Eyes

It is like trying to explain freedom to someone who has lived in extreme oppression their entire lives, it would take a professional a long time. Like one refugee I read about, he actually wanted to go back to his oppressive country, because freedom was "too difficult". Too many people these days have the same problem with companies, making excuses for their unacceptable behavior, because "surely, the company knows best, the problem must be YOU!". I mean come on, when most people can't even acknowledge that iphones, etc, are made by slaves, who so often jump to their deaths that they need "suicide nets" around the buildings, then what hope is there for notthematrix ever understanding KnC's criminality?

Intresting post  good to see there are more ways to get your goal.

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March 15, 2015, 11:21:31 PM
 #39945


"Power Consumption: 590 W (at the wall)"

KNC took more risk here by developing a 20 nm chip https://www.cryptocoinsnews.com/ccn-reveals-timeline-kncminers-struggle-20nm-asic-bitcoin-miners/

"My take on this is that most of the" mess ups are over with because a lot of the above revolved around one thing, 20nm chips. The fact that the technology is so new made it so that KnC spent over half a year with their research and development of the Neptunes."

Yup, and the customers paid dearly for KNC's mistakes.

Buy & Hold
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March 16, 2015, 12:01:22 AM
 #39946

I went for the bonus Neptune.
Sometimes you win sometimes you lose , you better grow up and accept it.
instead of putting energy in sweets you can not get.


I have been looking for a single satisfied knc CA batch nep customer.

Woot, the first one has been identified!!!
 
Did you purchase a CA batch nep directly from knc???
(from ebay is not the same thing)

If and only if you answer yes to above...
The ratio is now 999:1 (if we assume a CA batch of only 1000)
Start the parade!


YMMV
Smiley

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My sub 1337 vanity address Wink
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March 16, 2015, 12:02:01 AM
 #39947


"Power Consumption: 590 W (at the wall)"

KNC took more risk here by developing a 20 nm chip https://www.cryptocoinsnews.com/ccn-reveals-timeline-kncminers-struggle-20nm-asic-bitcoin-miners/

"My take on this is that most of the" mess ups are over with because a lot of the above revolved around one thing, 20nm chips. The fact that the technology is so new made it so that KnC spent over half a year with their research and development of the Neptunes."

Yup, and the customers paid dearly for KNC's mistakes.

makes it 3x590 thats quite good Wink
https://www.bitmaintech.com/productDetail.htm?pid=00020150303095018716e2uWKIA70662 I guess KNC were the first , and that has a risk.
if I ever want to expand capasity i would consider a and miner looking at the specs...


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March 16, 2015, 12:18:08 AM
 #39948

Two weeks after delivery and I have finally opened the box of my bonus 2-for-1 Neptune.

Just to confirm: my 2-for-1 Neptune is a new machine. It isn't an old Neppy from the Datorhall, there is not a speck of dust.

Ironically, I might have been better off with an old Neppy from the Datorhall, because apparently the new fans aren't as good as the old ones. I don't know yet because I haven't powered it on.

One annoyance: one of the modules is broken. The bolt that secures the heatsink to the case has sheared off from the case (leaving a hole in the case)... meaning that the heatsink is tipped over and not making contact with the ASIC.

Once I get some PSUs, I'll plug it in (4 modules). I'm not buying new PSUs, I will finally switch off some old machines (including a Jupiter and an AntMiner S1) and will use those PSUs. The Jupiter has been running 24x7 since 25th October 2013... it was my first decent miner.

Run a Bitcoin node, support the network.
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March 16, 2015, 12:20:50 AM
 #39949

I went for the bonus Neptune.
Sometimes you win sometimes you lose , you better grow up and accept it.
instead of putting energy in sweets you can not get.


I have been looking for a single satisfied knc CA batch nep customer.

Woot, the first one has been identified!!!
 
Did you purchase a CA batch nep directly from knc???
(from ebay is not the same thing)

If and only if you answer yes to above...
The ratio is now 999:1 (if we assume a CA batch of only 1000)
Start the parade!


YMMV
Smiley

I saw it as a gamble , I bought one with btc that I origanly bought for 50 ct's a peace. so my miner was about 16btc wat for me was about 8 euros.
and tweaking is something i like to do , and I believe in the power of bitcoin.
KNC developed on the edge , but if you are in bitcoin you can expect that.
Its always a gamble I gues , amd if bitcoin was about $2000 a peace now Nobody would had complained.


  


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March 16, 2015, 12:26:12 AM
 #39950

Two weeks after delivery and I have finally opened the box of my bonus 2-for-1 Neptune.

Just to confirm: my 2-for-1 Neptune is a new machine. It isn't an old Neppy from the Datorhall, there is not a speck of dust.

Ironically, I might have been better off with an old Neppy from the Datorhall, because apparently the new fans aren't as good as the old ones. I don't know yet because I haven't powered it on.

One annoyance: one of the cubes is broken. The bolt that secures the heatsink to the case has sheared off from the case (leaving a hole in the case)... meaning that the heatsink is tipped over and not making contact with the ASIC.

Once I get some PSUs, I'll plug it in. I'm not buying new PSUs, I will finally switch off some old machines (including a Jupiter and an AntMiner S1) and will use those PSUs. The Jupiter has been running 24x7 since 25th October 2013... it was my first decent miner.
Replace the fan  with theese http://www.noctua.at/main.php?show=productview&products_id=84&lng=en
put in fw 1.06s download it here
https://github.com/KnCMiner/images/raw/master/Neptune/neptune-1.06s.bin , get a propper PSU like the evga 1300 g2 supernova
if you do that you can undervolt it quite well so it uses about ~ 3.8 TH @ 1850 watt per miner.
 

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March 16, 2015, 05:52:24 AM
 #39951

Two weeks after delivery and I have finally opened the box of my bonus 2-for-1 Neptune.

Just to confirm: my 2-for-1 Neptune is a new machine. It isn't an old Neppy from the Datorhall, there is not a speck of dust.

Ironically, I might have been better off with an old Neppy from the Datorhall, because apparently the new fans aren't as good as the old ones. I don't know yet because I haven't powered it on.

One annoyance: one of the cubes is broken. The bolt that secures the heatsink to the case has sheared off from the case (leaving a hole in the case)... meaning that the heatsink is tipped over and not making contact with the ASIC.

Once I get some PSUs, I'll plug it in. I'm not buying new PSUs, I will finally switch off some old machines (including a Jupiter and an AntMiner S1) and will use those PSUs. The Jupiter has been running 24x7 since 25th October 2013... it was my first decent miner.
Replace the fan  with theese http://www.noctua.at/main.php?show=productview&products_id=84&lng=en
put in fw 1.06s download it here
https://github.com/KnCMiner/images/raw/master/Neptune/neptune-1.06s.bin , get a propper PSU like the evga 1300 g2 supernova
if you do that you can undervolt it quite well so it uses about ~ 3.8 TH @ 1850 watt per miner.
 


What are the configured parameters to reach that low power usage?

For security, your account has been locked. Email acctcomp15@theymos.e4ward.com
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March 16, 2015, 07:09:00 AM
Last edit: March 16, 2015, 07:28:11 AM by cryptodevil
 #39952

I saw it as a gamble

You can see it however the fuck you choose to, but don't sneer at other people for wanting to hold KnC to account for having breached the sales agreement due to their failure to meet their own promised specifications.

People made the decision to buy these devices on a number of factors, primarily the fact that it was being promised for Q2/Q3 and promised to be able to hash on any scrypt coin and any pool.

If KnC had said from the beginning, "Hey guys, we're going to have a go at making a scrypt miner but we can't promise we'll produce a fully functional device by the end of September" then maybe your "it's a gamble" claim would have merit. But when you have a company announcing in March that they are absolutely going to be delivering a fully functional scrypt-capable miner before the end of September, then they are legally-bound to that claim and, if they cannot meet their advertised specifications, then their customers are legally entitled to cancel their orders and receive a full refund.

What you are trying to do is to tell every customer who KnC screwed over with their "NO REFUND!!!1!!!!!!!" screeching when it became apparent that they were shipping an unfinished product while threatening to impose additional costs for anyone who refused to accept delivery, to simply shrug it off and say it's perfectly acceptable for a multi-million dollar hardware vendor to take their money and treat them like shit even though KnC are the party in breach of the sales contract.



WARNING!!! Check your forum URLs carefully and avoid links to phishing sites like 'thebitcointalk' 'bitcointalk.to' and 'BitcointaLLk'
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March 16, 2015, 08:44:02 AM
 #39953

Exactly.  Plus this tonight... melting Titan PSU power connectors.  

Thieves.

And they killed their message forum so I can't even ask others if they've had similar issues after updating to 2.00 Titan firmware.

http://imgur.com/tvyjtzH
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March 16, 2015, 08:48:45 AM
 #39954

Bunch of noise.

I did immediately contact their "support" (aka non-support) asking if the forums were lost of if they'd return... crickets.

Last week, KnC tweeted (https://twitter.com/kncminer/status/575024006312689664) that they are in the process of updating their web presence - implying that the forum will return.

Quote
We're in the process of updating our web presence, if you have a question pls contact r support dep. via kncminer.com

Then again, it seems folly to believe what they tell us.
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March 16, 2015, 08:59:57 AM
 #39955

Exactly.  Plus this tonight... melting Titan PSU power connectors.  

Thieves.

And they killed their message forum so I can't even ask others if they've had similar issues after updating to 2.00 Titan firmware.

http://imgur.com/tvyjtzH

it seems that the power consumption of the Titans that where delivered with a bunch of bad cores is not constant.

my HPC antec 1300 keeps randomly shutting down, maybe thats  what has prevented my power connectors from burning, but it is clearly a defective production since the pci-e connectors are not designed for so much power, they violate all IEEE standards.

and yes Sam and other at KNC  are thieves, they lied to us and took our money for promises not kept, and most importantly broke the law.
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March 16, 2015, 09:06:14 AM
 #39956

Exactly.  Plus this tonight... melting Titan PSU power connectors.  

Thieves.

And they killed their message forum so I can't even ask others if they've had similar issues after updating to 2.00 Titan firmware.

http://imgur.com/tvyjtzH

it seems that the power consumption of the Titans that where delivered with a bunch of bad cores is not constant.

my HPC antec 1300 keeps randomly shutting down, maybe thats  what has prevented my power connectors from burning, but it is clearly a defective production since the pci-e connectors are not designed for so much power, they violate all IEEE standards.

and yes Sam and other at KNC  are thieves, they lied to us and took our money for promises not kept, and most importantly broke the law.


I'm sure you know this but just in case from above post you are using TWO UPS power supplies with 4 y cables supplied (2 PSU leads to 1 cube) correct? Can't tell from the above post...if is just the one PSU (i know unlikely this is the case but just in case you only have 1 psu) that is the symptom when you try to run the works on 1 PSU.

Myself I run 2 corsair 1200i PSU's on 2 cubes (orig) now 3 cubes per PSU with no problems.

anyway disregard if the above is not the issue .....it just reads like you only have 1 psu and no y connectors too boot (You really really need the y connectors)

as to the bad die issue as an example ..my orig titan i have 2 bad dies (1 per 2 cubes) and got 306mh.....with a 2nd Titan I just got I am gettting (after them working themselves up to it for a week ) as of 3 hrs ago EXACTLY 650mh....on v2.00 and still 2 dead dies (1 each on 2 cubes) ....I almost took 2.00 off in that it was slower then 1.97 the first couple days but it seems after running a week it has gained me around 1mh or so..anyway..my experiences.















 

 

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March 16, 2015, 09:21:14 AM
Last edit: March 16, 2015, 10:55:45 AM by notthematrix
 #39957

Exactly.  Plus this tonight... melting Titan PSU power connectors. 

Thieves.

And they killed their message forum so I can't even ask others if they've had similar issues after updating to 2.00 Titan firmware.

http://imgur.com/tvyjtzH

dont use cheap sttuff to connect a miner!
http://www.hardocp.com/article/2014/12/11/evga_supernova_1300_g2_1300w_power_supply_review#.VQaepstZuCU
knc also send a connector to connect 2 PCI-E to 1..... you can also use theese http://www.ebay.com/itm/Official-KncMiner-Y-Cable-PCI-E-5-Pack-for-KnC-Titan-Neptune-Power-Cable-Adapter-/261696076264.
dont play with cheap power supplys they wiull burn you miner!

I will post undervolt pics later some cores runs as low as -0.0837

indication -0.0x the more > the value the lower the voltage! -0.1400 is lower then -0.0366 so start as low as -0.09x or even lower end just switch up til one core starts , but before you do this flash to FW 1.06s !
if core starts remember to voltage do so qith all cores ,, to get the minimum , if a core acts instable you can go +1 up from minimum.
I also defalted all cores to 500 mhz so the minimum foor 500mhz is found.
be pacvient sometimes cores doe start in 2 minutes , but that you can see by the amerage , it will go over 1 ampt , end will go up / down etc... and than it kicks in to +40 amps.....
al core are diffrent so some are very sensitive so can have very little volt and some need more.
It proffs that the 20nm precede is far from perfect , this is why some cores run more hot then others , but by undervolting them you can solve a lot of this problem.
and again you NEEED a proper power supply for this ,, like I said a standard consumer supply will not do!
id needs to be 80 gold ceritifies as the EVGA SuperNOVA 1300 G2 1300W is.

And if you are not willing or understanding how  to do that you can reealy better sell your bonus neptune on ebay . because otherwise you will just burn it!
Iam sorry , but thats IMO the fault knc made , they thougt all custumers were Highly tech poepole that understand , software icm with asic technology icm with electronics..... for example the voltage / sinus of a cheap power supply is not good.
here see why! https://www.youtube.com/watch?v=T-jG3vqRQHM as you can see the cheap PSU does wired things.....

https://www.youtube.com/watch?v=-mwV7YYiVT0 for knc you need gold!

https://www.youtube.com/watch?v=mCmLAtHcpdY (watch the osiloscope!!!!!) a bad psu will deliver crap osiloscope outputs!


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retro72
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March 16, 2015, 04:55:56 PM
Last edit: March 16, 2015, 05:14:24 PM by retro72
 #39958

but thats IMO the fault knc made , they thougt all custumers were Highly tech poepole that understand , software icm with asic technology icm with electronics.....

Really? And you know this how? Show me where KNC say you need to be an electronics engineer to run these things.  Because I can show you where Sam Cole says they sell to anyone.  
http://youtu.be/bxOHAha7MAk?t=45s

Sam Cole: "Yeah, sure, we're making ASIC mining equipment and we're selling to the general public. We're selling fully functional devices that anyone can come and buy."
(Thanks Teslaman)

If you have the skill and the aptitude to babysit and rebuild your miners and are happy to do so, have at it. But don't blame us customers for being pissed off when the FULLY FUNCTIONAL DEVICES we bought don't work as advertised and KNC tell us to go fuck ourselves.

As you don't mind a bit of "tinkering". I've got some lovely property in down town Damascus you might be interested in. Open plan, panoramic views, in slight need of renovation.



Give me a shout if you're interested. Cheesy
bt2084
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March 16, 2015, 06:50:48 PM
 #39959

I spoke too soon.  Got a reply today.  Authorized KnCMiner Forum is NOT in the plans to return:

Quote
Keith (kncminer)
Mar 16, 18:24

Hi,

We have updated our web presence to better represent our refocused business models and the decision was made to remove the forum as there are many other larger forums on the web with information and support for our products. We feel that running and maintaining a forum is not part of our core business plan.


Bunch of noise.

I did immediately contact their "support" (aka non-support) asking if the forums were lost of if they'd return... crickets.

Last week, KnC tweeted (https://twitter.com/kncminer/status/575024006312689664) that they are in the process of updating their web presence - implying that the forum will return.

Quote
We're in the process of updating our web presence, if you have a question pls contact r support dep. via kncminer.com

Then again, it seems folly to believe what they tell us.
bt2084
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March 16, 2015, 06:53:08 PM
Last edit: March 16, 2015, 07:43:29 PM by bt2084
 #39960

Thanks.  I am running two Power & Cooling Silencer Mk III 850 W PSU's.  Good quality, right?  I was under the impression I have some of the very best PSU's.

I had just upgraded to 2.00 firmware.  Just beware!  

Make sure you have a working smoke detector and no paper or wood underneath the connector.  Melting plastic is not good.

But the 2ndary cause behind the burned connector was the I had temporarily connected the Y-cable without one of the leads -- so it was being supplied with just one power feed.  The primary cause was the design -- using connectors not rated for such power loads.

Exactly.  Plus this tonight... melting Titan PSU power connectors.  

Thieves.

And they killed their message forum so I can't even ask others if they've had similar issues after updating to 2.00 Titan firmware.

http://imgur.com/tvyjtzH

dont use cheap sttuff to connect a miner!
http://www.hardocp.com/article/2014/12/11/evga_supernova_1300_g2_1300w_power_supply_review#.VQaepstZuCU
knc also send a connector to connect 2 PCI-E to 1..... you can also use theese http://www.ebay.com/itm/Official-KncMiner-Y-Cable-PCI-E-5-Pack-for-KnC-Titan-Neptune-Power-Cable-Adapter-/261696076264.
dont play with cheap power supplys they wiull burn you miner!

I will post undervolt pics later some cores runs as low as -0.0837

indication -0.0x the more > the value the lower the voltage! -0.1400 is lower then -0.0366 so start as low as -0.09x or even lower end just switch up til one core starts , but before you do this flash to FW 1.06s !
if core starts remember to voltage do so qith all cores ,, to get the minimum , if a core acts instable you can go +1 up from minimum.
I also defalted all cores to 500 mhz so the minimum foor 500mhz is found.
be pacvient sometimes cores doe start in 2 minutes , but that you can see by the amerage , it will go over 1 ampt , end will go up / down etc... and than it kicks in to +40 amps.....
al core are diffrent so some are very sensitive so can have very little volt and some need more.
It proffs that the 20nm precede is far from perfect , this is why some cores run more hot then others , but by undervolting them you can solve a lot of this problem.
and again you NEEED a proper power supply for this ,, like I said a standard consumer supply will not do!
id needs to be 80 gold ceritifies as the EVGA SuperNOVA 1300 G2 1300W is.

And if you are not willing or understanding how  to do that you can reealy better sell your bonus neptune on ebay . because otherwise you will just burn it!
Iam sorry , but thats IMO the fault knc made , they thougt all custumers were Highly tech poepole that understand , software icm with asic technology icm with electronics..... for example the voltage / sinus of a cheap power supply is not good.
here see why! https://www.youtube.com/watch?v=T-jG3vqRQHM as you can see the cheap PSU does wired things.....

https://www.youtube.com/watch?v=-mwV7YYiVT0 for knc you need gold!

https://www.youtube.com/watch?v=mCmLAtHcpdY (watch the osiloscope!!!!!) a bad psu will deliver crap osiloscope outputs!


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