Swedish ASIC miner company kncminer.com

[Gyrsur]

so much drama!

[KGBSlim]

so much drama!

I know, seriously why dont 1 of you start a 'KnC groupies and haters' thread?

[RickJamesBTC]

Cyper, I don't think blowing across the unit will make a big difference if you close the case. Right now you are bringing fresh air onto that board. Why don't you just strap that fan onto the heatsink on the open side working with the other fan, or switch the location of that board to one of the front slots where they get cold air from the big fans on the front. Otherwise, you could always cut a big hole on the side of the case and mount it properly.

Avenger, I didn't notice you set me straight, all I saw was some lame ad-hominem attack from a sad little boy and didn't need to respond to it. From reading your posts i honestly pity you, it must be hard to live your angry life... You probably need to go outside more, get some fresh air and sunlight.

Bitcoinorama! Good to see you again. Any idea when tuning software will arrive for November units?

[xstr8guy]

Cyper, I don't think blowing across the unit will make a big difference if you close the case. Right now you are bringing fresh air onto that board. Why don't you just strap that fan onto the heatsink on the open side working with the other fan, or switch the location of that board to one of the front slots where they get cold air from the big fans on the front. Otherwise, you could always cut a big hole on the side of the case and mount it properly.

Avenger, I didn't notice you set me straight, all I saw was some lame ad-hominem attack from a sad little boy and didn't need to respond to it. From reading your posts i honestly pity you, it must be hard to live your angry life... You probably need to go outside more, get some fresh air and sunlight.

Bitcoinorama! Good to see you again. Any idea when tuning software will arrive for November units?

I attached exhaust fans to the front grill on the inside of my case.  I just wired them up to the grill. It really helps to quickly pull the hot air out of the case. I can't understand why KNC didn't do that in the first place.  All PCs use a push-pull configuration for air circulation.  So why not do the same for an equally hot ASIC miner?

[Anenome5]

I attached exhaust fans to the front grill on the inside of my case.  I just wired them up to the grill. It really helps to quickly pull the hot air out of the case. I can't understand why KNC didn't do that in the first place.  All PCs use a push-pull configuration for air circulation.  So why not do the same for an equally hot ASIC miner?

I should think the hash-unit fans create enough positive air pressure. Do you mean you put fans on the back of the unit to pull air out? The front already has fans and it's the input, not output...

[RickJamesBTC]

They come with six fans blowing from the front of the case out the very open back, it seems like plenty of cooling to me. They shouldn't need more fans in the back. Not having the case on the miner would disrupt the intended airflow from front to back and probably make cooling worse, unless ambient air temp was very cold (like with mine, still no difference in hashrate). The front units are cooler, the back ones get the hot air from the front and don't get as cool. You could add more fresh air by putting a fan on the side of the case, blowing in front of each rear unit, or divert the hot air around them better.  First I'd take the hot one with a problem and move it up front.

[xstr8guy]

I attached exhaust fans to the front grill on the inside of my case.  I just wired them up to the grill. It really helps to quickly pull the hot air out of the case. I can't understand why KNC didn't do that in the first place.  All PCs use a push-pull configuration for air circulation.  So why not do the same for an equally hot ASIC miner?

I should think the hash-unit fans create enough positive air pressure. Do you mean you put fans on the back of the unit to pull air out? The front already has fans and it's the input, not output...

To me, the back of the case is where the cords come out... pretty much like everything else that we plug in.   

The back fans pull cool air in and the heat sink fans push that air through the fins of the heatsink. By the time the air has traveled though the fins it's hot and the velocity has slowed way down.  The logical thing to do is try to exhaust that hot air as quickly as possible before it has time to recirculate through the case again, hence the front exhaust fans.

[RickJamesBTC]

Front side has the pretty blinking lights. Either way, it's a lot of air moving that direction. To overpower it, you would need to install two more large fans on the back. If you are actually having a cooling problem, give it a try.

[Gyrsur]

so much drama!

I know, seriously why dont 1 of you start a 'KnC groupies and haters' thread?

sometimes (but not very often) you get in this thread usefull information if you have KnC devices.

[xstr8guy]

Front side has the pretty blinking lights. Either way, it's a lot of air moving that direction. To overpower it, you would need to install two more large fans on the back. If you are actually having a cooling problem, give it a try.

Strange, the back of my case has the blinky lights.  

I didn't get instructions to which end was the front and back.  It's all relative.  I've positioned my miner with the air intake side towards the back of the room.  The exhaust side blows the hot air out in to the room.  Apparently everyone is doing the opposite.

But it should be obvious by my previous explanations that I have NOT doubled up the fans on the intake side or "front" of the case.  I merely placed fans in the case where there were none... the exhaust side or "back" of the case.

[CYPER]

Hey Cypher... You can actually lower the cooling tower fan, the top of the plastic holder case will easily slide in between the fins, and it will cool dramatically better.....  the lower you put it, the better it will cool

I remember reading about this trick before in this thread. I will try next time I move them.

Is the heatspreader of the chip still flat? If the cooler was actually damaged while mounted, its reasonable to assume the flimsy alu heatspreader got dented or slightly bent too. Its even possible the heatspreader is no longer making proper contact with (all) the dies. I once had that with an AMD CPU, no matter what cooler I put on it, it would overheat, badly. removing the alu heatspreader solved that. Not sure Id be so brave with such an expensive miner where there are 4 seperate dies under the heatspreader, but I wouldnt mind seeing the pics if you decide to try

The top of the ASIC chip looks completely flat with no damage. It was the heatsink base that was damaged as each pipe was on a slighty different level, so the total surface wasn't flat.
I changed it with a brand new heatsink and temps didn't improve, but I think the problem might be the spacers as suggested below.

Some of the spacers between the aluminum bar and the board prevent the heatsink from making good contact with the chip.  If you twist the heat sink from the top and it moves easily, then it is too loose.  I had to remove the spacers on a couple of boards that were hot.  Just make sure you don't over-tighten the screws once the spacers are removed.

When I twist it it moves but for a different reason: the screws that go through the custom made plank and the original plank are smaller than the holes, so there is a slight horizontal wobble.
Next time I switch it off I will remove the spacer or put shorter ones (plastic ones that came with the heatsink).

Cyper, I don't think blowing across the unit will make a big difference if you close the case. Right now you are bringing fresh air onto that board. Why don't you just strap that fan onto the heatsink on the open side working with the other fan, or switch the location of that board to one of the front slots where they get cold air from the big fans on the front. Otherwise, you could always cut a big hole on the side of the case and mount it properly.

Exactly. If I close the case the back of the side fan will be next to the inside of the aluminium panel, so not enough room to gasp for fresh air.
Do you mean to create a push pull configuration?
From what I see the chip heatspeader doesn't get adequately cooled - probably because of poor contact with the heatsink base or maybe it is way too hot.
I will try all the tricks mentioned here and report back.

[CYPER]

Front side has the pretty blinking lights. Either way, it's a lot of air moving that direction. To overpower it, you would need to install two more large fans on the back. If you are actually having a cooling problem, give it a try.

Strange, the back of my case has the blinky lights.  

I didn't get instructions to which end was the front and back.  It's all relative.  I've positions my miner with the air intake side towards the back of the room.  The exhaust side blows the hot air out in to the room.  Apparently everyone is doing the opposite.

But it should be obvious by my previous explanations that I have NOT doubled up the fans on the intake side or "front" of the case.  I merely placed fans in the case where there were none... the exhaust side or "back" of the case.

I had that same idea long before anyone received any miners, but then dropped it.
Might get some cheap 140mm fans and do it after all. Throw in a fan controller too.

[xstr8guy]

Front side has the pretty blinking lights. Either way, it's a lot of air moving that direction. To overpower it, you would need to install two more large fans on the back. If you are actually having a cooling problem, give it a try.

Strange, the back of my case has the blinky lights.  

I didn't get instructions to which end was the front and back.  It's all relative.  I've positions my miner with the air intake side towards the back of the room.  The exhaust side blows the hot air out in to the room.  Apparently everyone is doing the opposite.

But it should be obvious by my previous explanations that I have NOT doubled up the fans on the intake side or "front" of the case.  I merely placed fans in the case where there were none... the exhaust side or "back" of the case.

I had that same idea long before anyone received any miners, but then dropped it.
Might get some cheap 140mm fans and do it after all. Throw in a fan controller too.

If all else fails, try Corsair liquid cooling instead of the standard heatsink.

[RickJamesBTC]

I meant cut additional holes on the sides of the case in front of the fans for the two rear units and install fans blowing MORE air into the case. I still think you should try switching the location of the hot unit to the front and see how it goes.

[jpesquire]

Been lurking for a while, but wanted to share some Nov Jupiter experience in case it helps someone.

I have a Mercury and received a Nov Jupiter last night.  I had the Mercury on a "Rosewill 650W 80 PLUS BRONZE Certified Power Supply Hive-650" and bought a "XFX PRO1000W" for the Jupiter.  However, the XFX would shutoff after a couple minutes when running the Jupiter.  The  solution I found that worked was to plug an extra PCI-E cable from the Rosewill into one of the ASIC boards on the Jupiter.  This has kept me happily hashing on the P2Pool at close to 800GH/s (Mercury + Nov Jupiter) ever since.  

I am not a hardware guy, so I'm not sure what's going on.  I assume the 1000W wasn't enough for the Jupiter, but that doesn't sound right given what everyone else is writing.

FWIW, the fans were all attached on the Jupiter when I received it.  The box was shredded, but the miner was in much better condition than the Mercury.

[Edited to clarify how the 800 happened.]

[sickpig]

Been lurking for a while, but wanted to share some Nov Jupiter experience in case it helps someone.

I have a Mercury and received a Nov Jupiter last night.  I had the Mercury on a "Rosewill 650W 80 PLUS BRONZE Certified Power Supply Hive-650" and bought a "XFX PRO1000W" for the Jupiter.  However, the XFX would shutoff after a couple minutes when running the Jupiter.  The  solution I found that worked was to plug an extra PCI-E cable from the Rosewill into one of the ASIC boards on the Jupiter.  This has kept me happily hashing on the P2Pool at close to 800GH/s ever since.   

I am not a hardware guy, so I'm not sure what's going on.  I assume the 1000W wasn't enough for the Jupiter, but that doesn't sound right given what everyone else is writing.

FWIW, the fans were all attached on the Jupiter when I received it.  The box was shredded, but the miner was in much better condition than the Mercury.

any chance to measure power consmption at the wall?

anyway congrats for the 800GH/s

[CYPER]

Been lurking for a while, but wanted to share some Nov Jupiter experience in case it helps someone.

I have a Mercury and received a Nov Jupiter last night.  I had the Mercury on a "Rosewill 650W 80 PLUS BRONZE Certified Power Supply Hive-650" and bought a "XFX PRO1000W" for the Jupiter.  However, the XFX would shutoff after a couple minutes when running the Jupiter.  The  solution I found that worked was to plug an extra PCI-E cable from the Rosewill into one of the ASIC boards on the Jupiter.  This has kept me happily hashing on the P2Pool at close to 800GH/s ever since.   

I am not a hardware guy, so I'm not sure what's going on.  I assume the 1000W wasn't enough for the Jupiter, but that doesn't sound right given what everyone else is writing.

FWIW, the fans were all attached on the Jupiter when I received it.  The box was shredded, but the miner was in much better condition than the Mercury.

Close to 800GH/s?
Care to post a screenshot of CGMiner average speed?

Just for comparison - my 2 November Jupiters are eating 1770W from the wall with a peak of almost 2000W.

[jpesquire]

Close to 800GH/s?
Care to post a screenshot of CGMiner average speed?

Just for comparison - my 2 November Jupiters are eating 1770W from the wall with a peak of almost 2000W.

No immediate way to measure at the wall.  Might invest in something to do that soon.  If you are peaking at 2000W, that could explain why it would run for several minutes before clicking off.

800GH/s includes the Mercury using pool's measurement (varies between 750 and 850).  CGMiner has me closer to 700 right now (585.3 + 123.9).

[jelin1984]

How you make the Jupiter run at 800 gh??

[jpesquire]

How you make the Jupiter run at 800 gh??

I didn't.  I included a Mercury with it.  Sorry for the confusion.  Should probably edit that post....