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Author Topic: Swedish ASIC miner company kncminer.com  (Read 3039471 times)
bitgeek
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July 05, 2014, 12:02:37 PM
 #36501

Im not too impressed with the airflow on that Noctua.  Its only about 20% more airflow than the stock fan that comes with the Neptune.  I require at least 200+ CFM.
This is the fan for you -240CFM, one downside is that Deltas are extremely loud.

http://www.newegg.com/Product/Product.aspx?Item=N82E16835213001


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samsonn25
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July 05, 2014, 12:24:32 PM
 #36502

5200 rpm.  Damn
NEO2012
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July 05, 2014, 02:34:47 PM
 #36503


yeah is u john titor?
user27
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July 05, 2014, 05:37:06 PM
 #36504

As I understand it to cool Neptune VRM's there is a poorly manufactured aluminum plate in the form of an "E" with the outer legs on the VRM's and the middle leg holding the heat sink in place.

There is some kind of thick heat foam between the VRM's and the plate to transfer the heat to the plate but then where does the heat go? Is it dissipated by the metal plate or is it thermally bonded to the top of the heat pipe sink?

Thanks

The VRM heat goes from VRM -> foam -> plate ->  some radiates off the plate some may transfer down from the plate into ASIC heatsink but that would depend on temperature of each part.
The heat only goes to cooler places, if the base of heatsink is hotter than the plate(not VRM temp BTW) it will warm it(plate) too.

(second law of thermodynamics??)

If the 'heatsink base' is cooler than the plate, adding a dab of grease between plate and heatsink would help.
Else the ASIC will contribute to VRM temp issues.

Would need to attach thermocouple to a small probe  and measure plate and base of heatsink to 'know'.

The plate is WELL MANUFACTURED.
They are almost perfectly flat.
Turns out IMneverHO that flat is not ideal.
I bend the ends of the outer legs down for better contact of plate/foam/VRM.

Easy no parts needed improvement in VRM temps!
You can look at imprint in foam and determine where it needs more pressure.

It can be done without unsticking heatsink from ASIC if you bend the fan back and carefully pry plate up from VRM's.
The foam acts like doublesided tape.
It's more like clay or plumbers putty than foam.

I also squeezed the foam/clay a bit to make it taller before reinstall of plate.

YMMV
Smiley

EDIT there is also foam below PCB under same challenged VRM's.
Raising cubes up a bit will help bottom of case radiate some of the heat.

The whole foam thing is an OK idea but poorly implimented.

Thanks, fairly sure I know what to do when / if they arrive now. Shame KfC have to date refused to either refund or dispatch miners.

u27

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July 05, 2014, 06:10:33 PM
 #36505

A 140mm fan would need to spin higher than 2000 rpm.  There are not many out there.

Take out the large, ridiculous fan and replace it with 4 small little fans. Your options on those size fans are limitless.


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rograz
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July 05, 2014, 06:33:53 PM
 #36506

A 140mm fan would need to spin higher than 2000 rpm.  There are not many out there.

Take out the large, ridiculous fan and replace it with 4 small little fans. Your options on those size fans are limitless.



not really an improvement since 60mm fans cap out at 60ish cfm and I dont think there are that many 70mm fans around.
user27
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July 05, 2014, 06:38:20 PM
 #36507

A 140mm fan would need to spin higher than 2000 rpm.  There are not many out there.

Take out the large, ridiculous fan and replace it with 4 small little fans. Your options on those size fans are limitless.


I have a bunch of fast 120mm fans from my old 132nm setup; they allowed me to o/c by 50% back then so fingers crossed they will do the job when/if KfC ever send me miners. Really don't want to be spending a lot of cash on cooling these given that ROI is already a distant glimmer.


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July 05, 2014, 06:39:01 PM
 #36508

A 140mm fan would need to spin higher than 2000 rpm.  There are not many out there.

Take out the large, ridiculous fan and replace it with 4 small little fans. Your options on those size fans are limitless.



not really an improvement since 60mm fans cap out at 60ish cfm and I dont think there are that many 70mm fans around.

Then its dremel time. May as well have the one whole side of fans.

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July 05, 2014, 07:36:00 PM
Last edit: July 05, 2014, 08:28:25 PM by Rawbit
 #36509

Hi,

My controlboard needs to be flashed (blank screen and ASICS are not recognized). But when I unzip https://www.kncminer.com/userfiles/file/SD_Neptune_rc6.zip to SD card and start controlboard with this card it just won't boot/flash (no green led). Is there another way to flash it? I'm able to log in to BBB via ssh or GUI.

Best regards
Powell
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July 05, 2014, 08:20:11 PM
 #36510

Has anyone ever removed the ASIC itself from the Jupiter boards?  I thought getting everything off the back off the board where it is mounted would help but no go on that one. 
Phoenix1969
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July 06, 2014, 04:50:49 AM
 #36511

Hi,

My controlboard needs to be flashed (blank screen and ASICS are not recognized). But when I unzip https://www.kncminer.com/userfiles/file/SD_Neptune_rc6.zip to SD card and start controlboard with this card it just won't boot/flash (no green led). Is there another way to flash it? I'm able to log in to BBB via ssh or GUI.

Best regards
shouldn't you be flashing rc9?


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Searing
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July 06, 2014, 05:02:29 AM
 #36512



Ack! it is the 'seed' in which 'SkyNet" shall be born..... Ack!

(it all makes sense the bitcoin network now has more computing power worldwide..all linked machines...its a TRAP!)

Searing

Try out www.synchro.net An 'Old School' BBS (Bulletin Board System) works on Win /10/8/7 and Linux!
Three-minute install. The last upgrade was Jan 1st, 2019. I think you will be impressed by this project!
Phoenix1969
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July 06, 2014, 05:08:00 AM
 #36513



Ack! it is the 'seed' in which 'SkyNet" shall be born..... Ack!

(it all makes sense the bitcoin network now has more computing power worldwide..all linked machines...its a TRAP!)

Searing
those look mysteriously like Jupiter(28nm) boards...  nice work


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tolip_wen
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July 06, 2014, 05:48:29 AM
 #36514

those look mysteriously like Jupiter(28nm) boards...  nice work

they are 28nm

The text at the time did kinda indicate that.
In my own unclear way.

I linked the pic as an example of straight hose barbs on waterblocks.
As opposed to 90-91 whatever it takes Wink

20nm pics soon

YMMV
Smiley

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July 06, 2014, 06:30:15 AM
 #36515

Good news guys.  I have reduced my VRM temps by 20 degrees C with my new delta fan:


Heres a comparison with the other cubes that still have the stock fans:


Only problem is that it sounds like a Boeing 747 but i would rather be deaf than having burnt VRMs.

How much CRM for the delta fan? It is used to blow the cold air in right? I thought there is a fan inside the box?

Its 240 CFM. 

http://www.newegg.com/Product/Product.aspx?Item=N82E16835213001&cm_re=delta_120mm_fan-_-35-213-001-_-Product

There stock 120mm fan was mounted on the inside but I removed that and had to mount the delta fan on the outside because the delta fan is thicker and wont fit on the inside.  Also I had to use a 120mm to 140mm fan adapter which also adds thickness.  Thats why it looks so bulky in the pic.  It blows air into Neptune.

thank you for the reply! do you have any idea how much cpm the stock 120mm fan has?

I typo-ed.  The stock fan that comes with the Neptune is a 140mm fan with 122 CFM.  This is the stock fan:

http://www.newegg.com/Product/Product.aspx?Item=N82E16835345069&cm_re=140mm_fan-_-35-345-069-_-Product

I couldn't find many 140mm fans with more than 122 CFM so thats why I got 120mm delta fans.


just curious, if I keep the stock 140 fan inside the neptune box, and put an extra 140mm fan in the back outside the box to suck the hot air out, how much performance gain I can get? To put an extra 140mm fan should be a much easier DIY option.

For security, your account has been locked. Email acctcomp15@theymos.e4ward.com
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July 06, 2014, 06:39:55 AM
Last edit: July 06, 2014, 06:52:29 AM by tolip_wen
 #36516


Ack! it is the 'seed' in which 'SkyNet" shall be born..... Ack!

(it all makes sense the bitcoin network now has more computing power worldwide..all linked machines...its a TRAP!)

Searing


We'll know when I complete the pentagon and say the verse.

"Same thing we do every night Pinky, try and take over the world"

YMMV
Smiley

P.S. no ya can't say it in English I just translated it for Yall Smiley

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July 06, 2014, 07:21:05 AM
Last edit: July 06, 2014, 07:45:36 AM by Rawbit
 #36517

shouldn't you be flashing rc9?
There are no rc9 SD files :-(
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July 06, 2014, 09:14:01 AM
 #36518

Tigggger created the topic KnC Miner list of orders - Neptune.
Please keep us updated.
If you are not listed and you received your miner, don't hesitate to give your order number.

My lucky BTC address : 1LoTTerY3WYbGxVRHvh8oDudDdTxFvvqWF
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July 06, 2014, 10:48:40 AM
Last edit: July 06, 2014, 11:26:13 AM by tolip_wen
 #36519

I had another idea,
re:VRMs and all stock parts.

Carefully remove the plate and look at the imprint in the foam/clay.

Cut some of the extra foam away.
Leave some extra, don't go too wild!!!

If you don't want to bend your bars,
Cut thin slices of extra foam and place where contact is slight or none.

This might help with airflow and heatsink path for VRM heat removal.

Put on the robe, light the candle, turn out the lights, and perform the smoke test!

YMMV
Smiley

EDIT
For extra credit and possibly no improvement,
drill 3 holes in plate between 4 VRMs where clay was removed.
Holes no bigger than imprint on clay else ruin heatsink 9-10mm.

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July 06, 2014, 11:04:54 AM
 #36520

I finally have time to follow KnCs Neptune troubleshooting guide: http://forum.kncminer.com/forum/main-category/hardware/48166-neptune-troubleshooting-guide

Two of my five modules work, the other three don't even register as an ASIC under the advanced tab.  It's almost like they're not plugged in or powered up (but they are).

I have opened up one of the non-working modules, and there's nothing wrong that I can see from a visual inspection.

Does anyone have any advice?

test with only one box and one PSU, switch boxes and cables/plugs/PSU,... try to find the cause.....
Thanks Elenelen, I finally narrowed it down to the cables. Turns out two of them don't work. I have asked KnC to send me some more cables.

I have got three modules running at 275Mhz for a total of about 750GH/s. I've tried various frequencies all the way up to 400MHz, but above 300MHz massive numbers of cores are disabled due to hardware errors.  At 400MHz after 70 mins on three ASICs I got 600 GH/s at the pool. I can't try 475MHz yet as my AX1200i PSUs shut down. I'll try it once I get those 2-to-1 PCIe cables from Cablez.

Run a Bitcoin node, support the network.
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