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Author Topic: Swedish ASIC miner company kncminer.com  (Read 3012914 times)
rograz
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July 05, 2014, 05:38:33 AM
 #36501

A 140mm fan would need to spin higher than 2000 rpm.  There are not many out there.
Noctua has this monstrosity
http://www.noctua.at/main.php?show=productview&products_id=84&lng=en&set=1
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samsonn25
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July 05, 2014, 05:46:54 AM
 #36502

http://www.quietpc.com/nf-a14-ippc-3000-pwm
ilovethebtc
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July 05, 2014, 05:49:30 AM
 #36503

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.
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July 05, 2014, 06:06:44 AM
 #36504

ye the low airflow is the curse of x25mm fans, a personal favorite is the Silverstone SST-FHP141. It has the same airflow as the noctua but at 2000rpm since it's x38mm (only thick 140mm fan I've managed to find) It's virtually inaudible compared to the crazy delta fans, then again so is a yet engine ;P
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July 05, 2014, 12:02:37 PM
 #36505

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
 #36506

5200 rpm.  Damn
NEO2012
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July 05, 2014, 02:34:47 PM
 #36507


yeah is u john titor?
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July 05, 2014, 05:37:06 PM
 #36508

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
 #36509

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
 #36510

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.
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July 05, 2014, 06:38:20 PM
 #36511

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
 #36512

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
 #36513

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
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July 05, 2014, 08:20:11 PM
 #36514

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. 
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July 06, 2014, 04:50:49 AM
 #36515

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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July 06, 2014, 05:02:29 AM
 #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

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July 06, 2014, 05:08:00 AM
 #36517



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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July 06, 2014, 05:48:29 AM
 #36518

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
 #36519

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.

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July 06, 2014, 06:39:55 AM
 #36520


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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