Swedish ASIC miner company kncminer.com

[DeathAndTaxes]

orama,

thx for update!

i got one corsair 1050 hx running.

is that also a problem or just the 850???

Same question but substitute Corsair AX860.

Look there's no science behind what i'm relaying as i'm not first hand dealing with any of the cap issues. And i've probably not relayed the exact broke English/Swedish version I was told by one of the engineers present. But for sure the fact is every blown cap that has been set back via RMA has been using a Corsair HX850 to power it; and it's the one consistent link, and Anotherhost.se unfortunately were running all their hosted boards with that power supply and have had to switch.

Found this on a Cooler Master review. Is this related?

Inrush current or switch-on surge refers to the maximum, instantaneous input-current drawn by an electrical device when first turned on. Because of the charging current of the APFC capacitor(s), PSUs produce large inrush-current right as they are turned on. Large inrush current can cause the tripping of circuit breakers and fuses and may also damage switches, relays and bridge rectifiers; as a result, the lower the inrush current of a PSU right as it is turned on, the better.

Simple version is no.

The quotes refers to the inrush on the AC side of a power supply.  It is taking about how much peak current the power supply will pull from the outlet when it is plugged in.  Simplifying somewhat a power supply has lots of beefy capacitors and those capacitors can charge very quickly resulting a very high power draw (even if the PSU isn't connected to any load).    A good PSU will limit the inrush by "slowing down" the charging of the capacitor bank.  A poor one won't and that could (depending on what else is on the AC branch circuit and breaker limit) exceed the limit for the circuit and cause the breaker to trip.  Still all that has to do with the AC side of the circuit.

I don't know how or why the KNC miner in question was destroyed however the explanation that a power supply "forced" too much power into it is well nonsense and violates basic electrical theory. A circuit (any circuit) "pulls" current.  A power supply isn't going to "delivery" any more current then is pulled by the circuit.  It is up to the circuit/device to ensure it doesn't pull too much.  A 1200W PSU doesn't mean it forces 1200W into every circuit it is connected to it simply means the power supply can deliver up to 1200W.   Just like a "regular outlet" is 15A that is 1800W max but if you connect a lamp with a 23W light bulb the outlet doesn't "force" 1800W into the lamp exploding it.

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[Vedran Yoweri]

i still have no "miner settings" page when tab is pressed, but i was able to config cgminer thru the ssl...?

not bad for a saturn...eh?

Great!
By tabs they mean keys.  pff.

[Biomech]

 When I moved to Boise in '90,

there was no world wide web back in '90... and I think not even internet in Boise, maybe not even today   

Uh, really?

Google Micron Technology.

Boise/Treasure Valley area is a high tech mecca like Silicon Valley. There was, of course, no internet because there was no internet anywhere But we had tech. That was why it was so hard to get an apartment. Zilog, HP, Micron, and several startups were hiring like mad. Boise doubled in size in the early 90's on a high tech boom.

[DeathAndTaxes]

Boise .... But we had tech.

Potato tech maybe.  (Just kidding).

[Ajay]

anyone willing to help me out on teamveiwer to setup my miner having some trouble

Thanks guys its all sorted and I'm now up and running if anyone else needs help then I suggest this guy---->  https://bitcointalk.org/index.php?action=profile;u=102694

He was very helpful and guided me every step of the way also helped me with the ssl for cgminer Thanks

[DPoS]

why is the miner setting page totally blank? says webpage not available...?

when you typed screen ~r it replied [screen is terminating]

I have no idea what that meant but you could of wacked something.  Might be good to just reboot miner (if you dont have a corsair psu lulz) as long as you haven't touched anything else

if you already messed with files then you have to retrace your steps

[Elenelen]

Bitcoinorama, First of all: THANK YOU, for your great reporting!

But now to the bare facts:

I have received my Jupiter today and tested it thoroughly (0.91, 0.93 and 0.94) and this on all 4 ASIC-boards as one Jupiter-system, as well as each ASIC-board separately (only connecting one board at one time). And found huge differences in the boards.

Actually only one of my Jupiter-boards is working very well, one is running more or less OK (has some Core disables), but 2 are just bad. Together they make only 390 Gh/s (the good one is 135 Gh).

Be aware that this Jupiter is cooled very well (in a Server-room with 18 C, without the case-top, and even an extra Fan blowing 18 C cool air into the Jupiter-box).  So hardware-errors due to heat problems are impossible.  Still the bad boards have about 30% of bad cores…. Reducing the optimum hashrate from 140 G/s per ASIC-board to 100 or less.

Sure the FW versions 0.91 to 0.94 are trying to “stabilize” the system, but actually it’s only disabling the faulty cores per ASIC. This disabling results in less reporting of HW-errors indeed, and so reduces the Hashrate performance as well (by disabling 30% of the cores). This disabling is also noticeable if you look at the Temperatures of the ASICS (and their Watt use). See this list (sorry, I don't know how to insert a screenshot into this post):

ASIC slot #1: 57 C
ASIC slot #2: 36 C
ASIC slot #3: 38 C
ASIC slot #4: 41 C

the one with 57 C runs very well (on its own about 135 Gh).

So looking to all other posts and reports about Jupiters running 550 Gh and others like me running only 391 or lower: You simply are lucky if you received a Jupiter with 4 good ASIC-boards (then 4 times 135 is about 540). If you have one or more not so well manufactured ASIC-boards you end up (much) lower.  I’m afraid (please ask Sam for me) that software updates will NOT solve this thing. We need to replace the hardware: more boards per Jupiter (tested at KnC before shipping) that are capable of running 140 G without Hardware-errors.
 

[The Avenger]

"But surely if we hand write "fragile" in marker pen, they'll know it's a piece of delicate electronics worth $8000 and handle it carefully?"

[Xialla]

"But surely if we hand write "fragile" in marker pen, they'll know it's a piece of delicate electronics worth $8000 and handle it carefully?"

KNC is ignoring complaints about packaging. Official forum is flooded by photos of disassemble coolers after delivery and holes in cartoon boxes. No one cares and week after first complain, KNC don't change anything in packaging.

 

[Bitcoinorama]

"But surely if we hand write "fragile" in marker pen, they'll know it's a piece of delicate electronics worth $8000 and handle it carefully?"

Holy shit! There's actually a joke that goes along with that, which appears a little insenstive now. And as a result a miner was actually packed in that box by mistake. I actually drew that on there myself, but I swear that left with UPS in mint condition;



Thanks for posting that, that actually appears to have been damaged purposely and maliciously, and as far as i'm concerned should burn UPS's delivery contract.

And no Xialla, get your facts straight KnC is NOT ignoring complaints, they've ordered a lot stronger boxes, and are awaiting delivery of them, as mentioned earlier.

[DPoS]

why is the miner setting page totally blank?

This happens in the original release if you have added more than one pool to the cgminer config file.

EDIT:

Throwing them around like the box in my pictures ??

http://imgur.com/a/s44NM

mine as well, even after I begged them to ship the fans and heatsinks unassembled





one or two out of 8 ain't bad for these guys!!!!

[Puppet]

Thanks for posting that, that actually appears to have been damaged purposely and maliciously,

Dont be silly. Its clear some other boxes were dropped on top of that one. Sturdier boxes I might add, KnC really should use better packaging.

[DPoS]

The heatsinks come from Arctic pre-assembled with the fans, the whole unit is just placed on the ASIC and affixed with the custom aluminium bracket.

wait what about paste???  just some pre-paste on these?   that would explain why some modules are hotter than others beside the other 10 reasons we have talked about

[Bitcoinorama]

Thanks for posting that, that actually appears to have been damaged purposely and maliciously,

Dont be silly. Its clear some other boxes were dropped on top of that one. Sturdier boxes I might add, KnC really should use better packaging.

From what height prey tell??!

Also why would a box be dropped clearly on top of the side of the unit when there are obvious arrows pointing in the direction of 'up'.

[soy]

why is the miner setting page totally blank? says webpage not available...?

Okay, back from working outside.  The poster was correct, the # is the command prompt and if you add a user, when you login as the user the command prompt will be $ so if you see the # prompt you have root privileges, if you have the $ you have user privileges.

did you run #cgminer --help or #cgminer --help | more  

if you are connecting to eligius then the command will be #cgminer -o stratum+tcp://mining.eligius.st:3334 -u (here put your bitcoin address to which the bitcoins will be sent) -p (anypassword)

[Bitcoinorama]

The heatsinks come from Arctic pre-assembled with the fans, the whole unit is just placed on the ASIC and affixed with the custom aluminium bracket.

wait what about paste???  just some pre-paste on these?   that would explain why some modules are hotter than others beside the other 10 reasons we have talked about

What are you on about? each chip is pasted prior to assembly an the manufacturing facility. They have a special metal grid that lies flush on top of the chip and the paste is spread thinly over.

[Xialla]

my miners after delivery:

[soy]

ps | grep cgminer

Ps ax doesn't work. It's nit the usual ps. It is the one that come with busybox

ps aux?

[soy]

i still have no "miner settings" page when tab is pressed, but i was able to config cgminer thru the ssl...?

not bad for a saturn...eh?

Best thing I've read all week, happy for you

@Biomech. Wasps then? Contains wasps, that's work? lol

Beautiful.  You're a lucky guy, KnC miners and you live in Hawaii.

[DeathAndTaxes]

my miners after delivery:

In the first photo the upper left hashing board is it just a camera trick or is one of the heatsink mounting screws missing?