Swedish ASIC miner company kncminer.com

[Cablez]

I have to ask, does this look right to everyone?  I am wondering if it is a bertmod issue or why I get such poor performance, just disabled cores not showing.

[btc_uzr]

seems like the reason for poor performance  

shut it down and press carefully (with light pressure) on those silver blocks, if there's a click it should work fine afterwards
if it doesn't help, RMA

[Crypto_Cumbrian]

I have to ask, does this look right to everyone?  I am wondering if it is a bertmod issue or why I get such poor performance, just disabled cores not showing.

Have you ran that Board in Isolation to see what Hashing rate you get from it. Unless its a mercury (if so what's your Speed).

[eurgbp2011]

I tried. Nothing is loose.
How to detect which board is faulty?
I'd have to send back to KNC some boards, but I do not know which one to send.

[soy]

just now...
Just as a little test... I gently just pressed on the vrm's on the slo sat, and rocked them side to side a tad with the tip of my finger. One of the vrm's gave a little "Click".
within 30 seconds, a couple cores were re-enabled in cgminer... and it has gained about 20 WU's in about 5 minutes, and 2-3 gh/s   Will keep updated...

few mins later...  couple more WU. 1 more gh/s

While my internet was down I shut down the miners and put a bit of cardboard between the VRMs and the ASIC cooler.  I looked closely and the metal tops are epoxy'd in place with thin lines of epoxy.  The snap could be one of those epoxy lines breaking.  I'd like to take the tops off and see if an expensive thermal tape would help any, then re-epoxy.

This seems to be very odd.  I am guessing that pressing a VRM wouldnt fix an issue with 1 -4 cores being out.  Has anyone else done this?  I have 4 cores that seem to be consistently off.

The theory is that the die is being heated closest to a VRM that is losing heat more than it should from the bottom rather than the top.  Its clip-on metal heat sink is epoxied in place with thin dots and lines of epoxy, possibly since the whining noise complaint.  If the warm VRM is losing heat primarily via the bottom the heat is moving thru the PCB then adding to the heat of the ASIC.  If a technician were holding the PCB by the VRM while carefully placing the epoxy, he could be lifting the heatsink away from the underlying components it's suppose to draw heat from.  Then you have a little gap between the heatsink and the underlying components.  Some take the board out, and, after placing it on a flat surface so the PCB doesn't flex and break BGA solder points under the ASIC, apply pressure to the top of the VRM but not too much.  They try and make better contact of the heatsink plate with the underlying components and in the process sometimes break the epoxy whence they hear a snap.

[Phoenix1969]

I tried. Nothing is loose.
How to detect which board is faulty?
I'd have to send back to KNC some boards, but I do not know which one to send.

status page

[Crypto_Cumbrian]

I tried. Nothing is loose.
How to detect which board is faulty?
I'd have to send back to KNC some boards, but I do not know which one to send.

Run Each board in Turn in Isolation for an Hour each or more.

Record the results (Hash rate, HW errors, Cores on and off and VRM DC/DC Status (using bertmod) ).

[demonmaestro]

Has anyone been able to get ahold of KNC today via the phone?

[soy]

What are these VRM's I've seen the last 10 pages? Are these those rectangle looking metal blocks on each ASIC modules? Each with a small white piece of tape/sticker on them? According to my thermal temp my warmest one is 90F. Maybe sticking a piece of thermal tape on top would help it out, no?

Like stuff like this?


http://www.frozencpu.com/cat/l3/g8/c487/s1288/list/p1/Thermal_Interface-Thermal_Pads_Tape-Thermal_Pad_-_05mm_-Page1.html

No.  Heat travels best thru metal.  Abutting perfectly flat metal surfaces should conduct heat best but the surfaces are never perfect.  Heatsink compound or tape of a heatsink compound with high thermal conductivity is sometimes placed between the metal surfaces to fill in air gaps.  No heatsink compound or tape conducts heat as well as the metal itself.  If one were to put heatsink thermal tape on the outside of a heatsink the heatsink would become less effective at losing heat.

[Basil]

Has anyone been able to get ahold of KNC today via the phone?

~ 40 times try and no one.   My problem is 60% jup from hosting is  offline.  Help me God.

[CYPER]

Has anyone been able to get ahold of KNC today via the phone?

Called about an hour ago - nobody picked up and then it went to voicemail in swedish.

[Cablez]

I have to ask, does this look right to everyone?  I am wondering if it is a bertmod issue or why I get such poor performance, just disabled cores not showing.

https://i.imgur.com/h2bd53G.png[/img]

Have you ran that Board in Isolation to see what Hashing rate you get from it. Unless its a mercury (if so what's your Speed).

I have to figure out which board it is first then I can get a speed on it.  Should be easy to spot though if that current stays the same. I will report back.

[Searing]

I go with (HW*100)/A

HW error % = HW/A+R+HW

where

HW = number of hw errors
A    = number of accepted
R    = number of rejected

with 0.97 I got something like 10-11% after almost 20 hours, whereas before the same miner running with 0.95 I used to have 5-7%

Thanks.  That changes mine from ~4.4% down to ~4.1%.  Although it doesn't agree with BertMod:

Device Hardware%=4.9875
Device Rejected%=4.1048
Pool Rejected%=4.3372
Pool Stale%=0.0000

mine is with screenshot of 548.4gh at the time it ranges up to 555gh i'm on .95
Jupiter (stock no changes)  with the (HW*100)/A  4.05% and the 2nd method above of 4.27%

so don't think i'm gonna upgrade yet...to .97

by the by I think I figured out why it seems folks "destroyed boxes" on arrival pics like mine arrived ...are showing or seem to have less problems.if the damage that severe happened at the beginning of the trip..the miner was basically 'carried" in 2 hands or it would fall out of the box..ie only explanation I can think of in I had only 1 fan loose and it works so well ..so the more destroyed the box the less likely they could toss it like a Frisbee..imho (weird thou)

of course it is likely just dumb luck..not sure that is what you want to see thou the DHL guy carrying your crushed wed dripping soggy miner in box with 2 hands to your door ...I musta looked like he just ran over my cat

anyway thanks for the info on knc miner use of this info etc

Searing

[btc_uzr]

stay on 0.95 - gives me better results than 0.97
which is weird, coz flush work seems to be fixed, but hashrate is still lower than on 0.95 with flushwork issue

*ok consumes less W, but I prefer more GH/s now

[demonmaestro]

Has anyone been able to get ahold of KNC today via the phone?

Called about an hour ago - nobody picked up and then it went to voicemail in swedish.

yea same here.

[Phoenix1969]

EUREKA!
I just discovered something.
They don't like to be OVERCOOLED either!

[timmmers]

Has anyone been able to get ahold of KNC today via the phone?

Called about an hour ago - nobody picked up and then it went to voicemail in swedish.

yea same here.

Try their Facebook page. Public questions tend to get answered fast.

https://www.facebook.com/Kncminer

[demonmaestro]

wtf is there work week tuesday,wednesday, thursday. and thats it? 

[timmmers]

wtf is there work week tuesday,wednesday, thursday. and thats it? 

More likely Fri afternoon early finish.
No sign of your rig yet?

[demonmaestro]

wtf is there work week tuesday,wednesday, thursday. and thats it?  

More likely Fri afternoon early finish.
No sign of your rig yet?

Duck no.

And this was on Ducking Wednesday...

From: Customer Service [mailto:[email protected]]
Sent: Wednesday, October 23, 2013 5:33 AM(-6 GMT)
To: Demonmaestro; Dl info
Subject: RE: Order number 6xxx

Hi,
 
Looking at the current production line your order should be completed tomorrow.
 
Should you have any further questions please do not hesitate to contact us.
 
Thanks
Emilia
 
Med vänlig hälsning  |  Best regards
Emilia Cole  
Kncminer
www.kncminer.com
Office: +46 8559 253 20