Swedish ASIC miner company kncminer.com

[FiatKiller]

Also, how can I change the background color in putty or Linux?

Click on the icon of two connected computers in the upper left corner of the Putty window, and select 'Change Settings' from them menu.  In the configuration dialog, select 'Window->Colors', and change any of the colors as you will.

Thanks. I always hated white on black. Harder to read to me. I like dark font on lighter backgrounds.

Also, been playing around with making the ASICs warmer. Best results so far are with case fans tilted towards the BBB and ASIC fans unplugged, but I still have a small house fan on Low at the empty end of the Saturn case tilted down to provide cooling for the VRM chips mainly. Temps are 46 & 41. WU is 4006(best ever), avg hashrate is 257(same as best ever), error rate is still high at over 18%, but best ever. This is after over 300K shares. I may actually turn the house fan off next, but that makes me nervous. Glad to hear the max temp is around 105C for the ASICs.

[sbfree]

Also, how can I change the background color in putty or Linux?

Click on the icon of two connected computers in the upper left corner of the Putty window, and select 'Change Settings' from them menu.  In the configuration dialog, select 'Window->Colors', and change any of the colors as you will.

Thanks. I always hated white on black. Harder to read to me. I like dark font on lighter backgrounds.

Also, been playing around with making the ASICs warmer. Best results so far are with case fans tilted towards the BBB and ASIC fans unplugged, but I still have a small house fan on Low at the empty end of the Saturn case tilted down to provide cooling for the VRM chips mainly. Temps are 46 & 41. WU is 4006(best ever), avg hashrate is 257(same as best ever), error rate is still high at over 18%, but best ever. This is after over 300K shares. I may actually turn the house fan off next, but that makes me nervous. Glad to hear the max temp is around 105C for the ASICs.

well guess you are another anomaly, welcome to the club.

just a guess, but maybe warmer temps allow the VRMs to do their jobs more effciently....look at your betmod stats to see any changes in
input/out current and output volt....

 

[Puppet]

Is there a way to monitor clockspeed?

[Its About Sharing]

Seems the Jupiter that I am in a Group Buy with (Aug 2nd order) just arrived last week and is hashing at 315Ghash/s. Looks like a chip is bad or the like.

Any good stories out there of KNC shipping out a replacement board or the like and not asking for the unit back with an RMA and such?

Thanks,
IAS

[AFox]

Seems the Jupiter that I am in a Group Buy with (Aug 2nd order) just arrived last week and is hashing at 315Ghash/s. Looks like a chip is bad or the like.

Any good stories out there of KNC shipping out a replacement board or the like and not asking for the unit back with an RMA and such?

Thanks,
IAS

Crypto_Cumbrian got a RMA for three of his boards :
https://bitcointalk.org/index.php?topic=170332.msg3393672#msg3393672
https://bitcointalk.org/index.php?topic=170332.msg3378206#msg3378206
https://bitcointalk.org/index.php?topic=170332.msg3381036#msg3381036


Edit : He received is new boards : https://bitcointalk.org/index.php?topic=170332.msg3408979#msg3408979

[elasticband]

just tried .97 firware, got a nice hashrate and low HW rate, but the fans were not spinning   73c on one core. reverted back. WTF KNC?

[HyperMega]

this "higher temp =  higher performance" doesnt make a lot of sense. Design aside, there are only two factors affecting performance:
- clockspeed. Is this variable on KnC? Can it be measured?
- number of functional cores/ % of HW errors. Does this go down as temps go up?

Thats it. The rest is statistical noise.

sense or not. i have one jupiter that reacts in the same way. additional cooling with a big box-fan on top of the miner = cgminer crashes every 5 min. without box-fan = cgminer stable / higher avg GH.

Can it be electrical interference from the fan's motor? They have quite a strong electromagnetic field when running.

It's probably a effect called temperature inversion. 28nm logic gets faster with higher temperatures.
http://siliconsaint.blogspot.com/2012/07/temperature-inversion-in-deep-sub.html?m=1

[Phoenix1969]

this "higher temp =  higher performance" doesnt make a lot of sense. Design aside, there are only two factors affecting performance:
- clockspeed. Is this variable on KnC? Can it be measured?
- number of functional cores/ % of HW errors. Does this go down as temps go up?

Thats it. The rest is statistical noise.

well believe it or not, my Saturn actually runs better warmer....maybe with heat things expand, and as some have said in earlier posting, maybe that help "seat" chip better, maybe heat make solder melt/soften and chip makes better contact.....

all I know is that slightly warmer has actually produced slightly better numbers.....fwiw

They are in denial because it doesnt make sense,,, lol  But it's the truth. Mine are still rockin' solid now, no drastic drop overnight this time.
It may not be this way for everybody, but the higher temps cured both ailing saturns, point blank.

I also noticed that the coldest sat is the slowest although I'm tickled with the speed

[elasticband]

just tried .97 firware, got a nice hashrate and low HW rate, but the fans were not spinning   73c on one core. reverted back. WTF KNC?

After reverting back, the two fans at the front of the case do not function!!!!

[xyzzy099]

this "higher temp =  higher performance" doesnt make a lot of sense. Design aside, there are only two factors affecting performance:
- clockspeed. Is this variable on KnC? Can it be measured?
- number of functional cores/ % of HW errors. Does this go down as temps go up?

Thats it. The rest is statistical noise.

sense or not. i have one jupiter that reacts in the same way. additional cooling with a big box-fan on top of the miner = cgminer crashes every 5 min. without box-fan = cgminer stable / higher avg GH.

Can it be electrical interference from the fan's motor? They have quite a strong electromagnetic field when running.

It's probably a effect called temperature inversion. 28nm logic gets faster with higher temperatures.
http://siliconsaint.blogspot.com/2012/07/temperature-inversion-in-deep-sub.html?m=1

I don't think so...  That phenomenon might make it possible to clock a chip faster at a higher temperature, but it should not effect the speed of a chip that is clocked at a constant speed.  Right?  I mean, if I am reading it right, the rise-times and fall-times on the edges will be faster, but I don't think these chips are clocked close to theoretical maximum where that might make a real difference.

[Phoenix1969]

this "higher temp =  higher performance" doesnt make a lot of sense. Design aside, there are only two factors affecting performance:
- clockspeed. Is this variable on KnC? Can it be measured?
- number of functional cores/ % of HW errors. Does this go down as temps go up?

Thats it. The rest is statistical noise.

sense or not. i have one jupiter that reacts in the same way. additional cooling with a big box-fan on top of the miner = cgminer crashes every 5 min. without box-fan = cgminer stable / higher avg GH.

Can it be electrical interference from the fan's motor? They have quite a strong electromagnetic field when running.

It's probably a effect called temperature inversion. 28nm logic gets faster with higher temperatures.
http://siliconsaint.blogspot.com/2012/07/temperature-inversion-in-deep-sub.html?m=1

I don't think so...  That phenomenon might make it possible to clock a chip faster at a higher temperature, but it should not effect the speed of a chip that is clocked at a constant speed.  Right?

I honestly think it's a VRM thing... not an asic thing..  
But the temperature inversion link says it all! wow...

[sbfree]

this "higher temp =  higher performance" doesnt make a lot of sense. Design aside, there are only two factors affecting performance:
- clockspeed. Is this variable on KnC? Can it be measured?
- number of functional cores/ % of HW errors. Does this go down as temps go up?

Thats it. The rest is statistical noise.

sense or not. i have one jupiter that reacts in the same way. additional cooling with a big box-fan on top of the miner = cgminer crashes every 5 min. without box-fan = cgminer stable / higher avg GH.

Can it be electrical interference from the fan's motor? They have quite a strong electromagnetic field when running.

It's probably a effect called temperature inversion. 28nm logic gets faster with higher temperatures.
http://siliconsaint.blogspot.com/2012/07/temperature-inversion-in-deep-sub.html?m=1

Learn a new thing everyday, thanks hypermega for that nice find.

[Its About Sharing]

Seems the Jupiter that I am in a Group Buy with (Aug 2nd order) just arrived last week and is hashing at 315Ghash/s. Looks like a chip is bad or the like.

Any good stories out there of KNC shipping out a replacement board or the like and not asking for the unit back with an RMA and such?

Thanks,
IAS

Crypto_Cumbrian got a RMA for three of his boards :
https://bitcointalk.org/index.php?topic=170332.msg3393672#msg3393672
https://bitcointalk.org/index.php?topic=170332.msg3378206#msg3378206
https://bitcointalk.org/index.php?topic=170332.msg3381036#msg3381036


Edit : He received is new boards : https://bitcointalk.org/index.php?topic=170332.msg3408979#msg3408979

Thanks for the reply. Any good stories?

[xyzzy099]

this "higher temp =  higher performance" doesnt make a lot of sense. Design aside, there are only two factors affecting performance:
- clockspeed. Is this variable on KnC? Can it be measured?
- number of functional cores/ % of HW errors. Does this go down as temps go up?

Thats it. The rest is statistical noise.

sense or not. i have one jupiter that reacts in the same way. additional cooling with a big box-fan on top of the miner = cgminer crashes every 5 min. without box-fan = cgminer stable / higher avg GH.

Can it be electrical interference from the fan's motor? They have quite a strong electromagnetic field when running.

It's probably a effect called temperature inversion. 28nm logic gets faster with higher temperatures.
http://siliconsaint.blogspot.com/2012/07/temperature-inversion-in-deep-sub.html?m=1

I don't think so...  That phenomenon might make it possible to clock a chip faster at a higher temperature, but it should not effect the speed of a chip that is clocked at a constant speed.  Right?

I honestly think it's a VRM thing... not an asic thing.. 

I would think that as long as the voltage from the VRM is above the chip's lower operating threshold, it should not make any difference, unless they are being overclocked heavily.

[sbfree]

Thought I would share this and maybe some here can even update it with new retailers....

http://coinmap.org/

[Phoenix1969]

I would think that as long as the voltage from the VRM is above the chip's lower operating threshold, it should not make any difference, unless they are being overclocked heavily.

The temp inversion article has me sold on it that 28nm chips run better a bit warm

[HyperMega]

this "higher temp =  higher performance" doesnt make a lot of sense. Design aside, there are only two factors affecting performance:
- clockspeed. Is this variable on KnC? Can it be measured?
- number of functional cores/ % of HW errors. Does this go down as temps go up?

Thats it. The rest is statistical noise.

sense or not. i have one jupiter that reacts in the same way. additional cooling with a big box-fan on top of the miner = cgminer crashes every 5 min. without box-fan = cgminer stable / higher avg GH.

Can it be electrical interference from the fan's motor? They have quite a strong electromagnetic field when running.

It's probably a effect called temperature inversion. 28nm logic gets faster with higher temperatures.
http://siliconsaint.blogspot.com/2012/07/temperature-inversion-in-deep-sub.html?m=1

I don't think so...  That phenomenon might make it possible to clock a chip faster at a higher temperature, but it should not effect the speed of a chip that is clocked at a constant speed.  Right?

Not if the actual speed is already at the edge for the selected core supply voltage. In this case hardware errors can be caused by timing violations. Higher temperature, less timing violations, less hardware errors/crashs.

[sbfree]

this "higher temp =  higher performance" doesnt make a lot of sense. Design aside, there are only two factors affecting performance:
- clockspeed. Is this variable on KnC? Can it be measured?
- number of functional cores/ % of HW errors. Does this go down as temps go up?

Thats it. The rest is statistical noise.

sense or not. i have one jupiter that reacts in the same way. additional cooling with a big box-fan on top of the miner = cgminer crashes every 5 min. without box-fan = cgminer stable / higher avg GH.

Can it be electrical interference from the fan's motor? They have quite a strong electromagnetic field when running.

It's probably a effect called temperature inversion. 28nm logic gets faster with higher temperatures.
http://siliconsaint.blogspot.com/2012/07/temperature-inversion-in-deep-sub.html?m=1

I don't think so...  That phenomenon might make it possible to clock a chip faster at a higher temperature, but it should not effect the speed of a chip that is clocked at a constant speed.  Right?

I honestly think it's a VRM thing... not an asic thing..  

I would think that as long as the voltage from the VRM is above the chip's lower operating threshold, it should not make any difference, unless they are being overclocked heavily.

could it be that the VRMs operate more efficiently at slightly higher temps and automatically provide slighlty higher amps without software/firmware instruction to do so....I do notice that the under performing chip has 2 cores with lower output volt. and current.....and that actually changes just by running the a/c and/or turning it off

p.s. saturn is on a apc ups, so can't be wall flucs

[Phoenix1969]

Yeah, I noticed all this when looking at my graph on eligius, and correlating speeds with time of day & temps. It only took a few minutes to tell the fan was causing problems... the rest is history
In fact, the machines may be overcooled.
The results are undeniable.

[felix64]

Good point, thanks.

I asked Liam over the phone and he told me max temp for the ASIC chips is 105C, so you are far from the point where they are overheating