Avalon ASIC users thread - page 135.

demkd

full member

Activity: 242

Merit: 100

Quote from: Tesla71 on July 05, 2013, 09:34:11 AM

Is that only how it is shown or maybe the fans are connected to the wrong output ? How to find out ?

Yes, sensors messed up, #3 sensor in module located near PSU, #2 sensor in last module, fans counted from thin fan. Temp sensors connectors located near thin fan you can easily swap it. (3-wire connectors).

I recommend move last module to #4 position and move air spoiler to #3 position.
Today I move module to #4 position and replaced thin fan with Scythe Glide Stream PWM (1900rmp) and added extra fan at left exhaust hole. (extra fan at center effective but heat build up in last module)

Now I have:
Chip frequency 336:
Fan1 Fan2 Fan3 T1 T2 T3
0 2400 2640 29 48 49 (27C room temperature, Fan1 and extra fan connected to PSU and run constantly at ~1900rpm)
697W from wall (80+Gold PSU)

Chip frequency 350:
Fan1 Fan2 Fan3 T1 T2 T3
0 2520 2640 29 50 50
726W from wall

ProfMac

legendary

Activity: 1246

Merit: 1002

Quote from: crazyearner on July 05, 2013, 11:49:23 AM

Quote from: ProfMac on July 05, 2013, 10:07:04 AM

I have a retail TP-Link 703n flashed with the Avalon software. It is running on my network so I can learn the interface before delivery.

Today I notice a large number of attempts to log in as root from 59.53.94.9
This may be an address in China, no DNS names are returned after the chinatelecom.10gigabitethernet6-1.core1.lax1.he.net hop.

Where did you find the logs for login attempts ?

On the web page. status --> system log

cypherdoc

legendary

Activity: 1764

Merit: 1002

con,

is a vardiff of 236 getting too high?

crazyearner

legendary

Activity: 1820

Merit: 1001

Quote from: ProfMac on July 05, 2013, 10:07:04 AM

I have a retail TP-Link 703n flashed with the Avalon software. It is running on my network so I can learn the interface before delivery.

Today I notice a large number of attempts to log in as root from 59.53.94.9
This may be an address in China, no DNS names are returned after the chinatelecom.10gigabitethernet6-1.core1.lax1.he.net hop.

Where did you find the logs for login attempts ?

bitdude

sr. member

Activity: 277

Merit: 254

Maybe a noobish question, but can't find answer to that:

How do I display UI of cgminer in my ssh session when cgminer runs as default (automatic service)?
I like the UI, want to play with pools, change them easily ...

~~And if it is not possible to bring that cgminer to my ssh session terminal, how do you switch pools?~~ -> using cgminer-api

ProfMac

legendary

Activity: 1246

Merit: 1002

I have a retail TP-Link 703n flashed with the Avalon software. It is running on my network so I can learn the interface before delivery.

Today I notice a large number of attempts to log in as root from 59.53.94.9
This may be an address in China, no DNS names are returned after the chinatelecom.10gigabitethernet6-1.core1.lax1.he.net hop.

Tesla71

sr. member

Activity: 302

Merit: 252

I noticed that the numbers of Fan# and Temp# are interchanged. Temp3 is alwas a bit more than Temp2, though Fan2 runs faster than Fan3.

Is that only how it is shown or maybe the fans are connected to the wrong output ? How to find out ?

crazyearner

legendary

Activity: 1820

Merit: 1001

Any ways on reducing hw errors and also how to update to latest cgminer or use cgminer separate to one in config of Avalon ?

el_rlee

legendary

Activity: 1600

Merit: 1014

I found the R9, unnecessary to mention that it is fucking small Wink

I guess it doesn't pay of to tweak around with the voltage, don't think that anybody will on existing boards.

loshia

legendary

Activity: 1610

Merit: 1000

Quote from: invader on July 05, 2013, 07:15:30 AM

Quote

What would it take for a volt mod? Soldering around on every single step down converter?

Yes, you need to change R9 resistor value in step-down converter, according to datasheet on TPS40193
the formula is

R9 = ( Vfb * R10 ) / ( Vout - Vfb ) , where Vfb is constant = 0.591v , R10 = 10.5k

for example, calculation for Vout = 1.2 give

R9 = ( 0.591 * 10500 ) / ( 1.2 - 0.591 ) = 6205.5 / 0.609 = 10189 , 10k resistor

in datasheet maximum Vout = 1.32

R9 = ( 0.591 * 10500 ) / ( 1.32 - 0.591 ) = 6205.5 / 0.729 = 8512 , 8.5k resistor

To make ~ 8.5k resistor from 10k you need to add in parellel 60k resistor, but i would advice you try to increase voltage in a little steps like 0.01v before you reach 1.32v

Sorry but i cant point you now where is that resistor located, i just look at hash_unit schematics.

Quote

How far (in % of HW errors) can I go up with the frequency without risking of damaging something?

I think hw error rate 2-3% is the highest that you want to see, more than that is a waste of energy.
You can damage the chips by increasing voltage to more than 1.32v - be careful.

invader ,

Nice reading thank you Wink

What about TPS40193? it was rated at 20A max. Will it burn into flames? At 350 each chip according to rumors (calcs on PSU input - Wall) eats about 1.8-1.9 A

What about other elements inductors and such?

Thank you in advance

el_rlee

legendary

Activity: 1600

Merit: 1014

Quote from: invader on July 05, 2013, 03:09:48 AM

At least in datasheet i see operating temperature range [ -20 .. +85 ]

Are you sure that's not Tj?

invader

sr. member

Activity: 266

Merit: 250

Quote

What would it take for a volt mod? Soldering around on every single step down converter?

Yes, you need to change R9 resistor value in step-down converter, according to datasheet on TPS40193
the formula is

R9 = ( Vfb * R10 ) / ( Vout - Vfb ) , where Vfb is constant = 0.591v , R10 = 10.5k

for example, calculation for Vout = 1.2 give

R9 = ( 0.591 * 10500 ) / ( 1.2 - 0.591 ) = 6205.5 / 0.609 = 10189 , 10k resistor

in datasheet maximum Vout = 1.32

R9 = ( 0.591 * 10500 ) / ( 1.32 - 0.591 ) = 6205.5 / 0.729 = 8512 , 8.5k resistor

To make ~ 8.5k resistor from 10k you need to add in parellel 60k resistor, but i would advice you try to increase voltage in a little steps like 0.01v before you reach 1.32v and look at hw error rate.

Sorry but i cant point you now where is that resistor located, i just look at hash_unit schematics.

Quote

How far (in % of HW errors) can I go up with the frequency without risking of damaging something?

I think hw error rate 2-3% is the highest that you want to see, more than that is a waste of energy.
You can damage the chips by increasing voltage to more than 1.32v - be careful.

rudrigorc2

legendary

Activity: 1064

Merit: 1000

Quote from: cypherdoc on July 03, 2013, 12:12:54 PM

Quote from: elasticband on July 03, 2013, 12:09:16 PM

fans are almost at max..... but tempratures look low wnough

what's the max, 4000?

One machine here both coolers runs close to 4000, 39xx
and the other one has one fan that max out at 3720

el_rlee

legendary

Activity: 1600

Merit: 1014

Quote from: invader on July 05, 2013, 03:09:48 AM

Quote

I was thinking about reworking the original heatsinks to fit on the top...

It's useless in general, too much work for too little effort. Better pay more attention to thermal contact of PCB bottom and heatsink. Also thanks for pictures, i noticed your chips is at 50 c, thats a good temperature - they will work fine up to 100c as was said somewhere. At least in datasheet i see operating temperature range [ -20 .. +85 ]

The plate would only be for better thermal contact of PCB bottom and heatsink. The PCB is just too soft to be pressed against the aluminium properly over the whole surface just by the few screws.

What would it take for a volt mod? Soldering around on every single step down converter?

How far (in % of HW errors) can I go up with the frequency without risking of damaging something? What's the time frame the --avalon-auto option uses to calculate the HW error rate and adjust the frequency?

BenTuras

hero member

Activity: 826

Merit: 1001

Quote from: -ck on July 05, 2013, 02:34:08 AM

Mine has been upside down most of the time without a problem. It all looked pretty well secured when I opened it up and heat radiates from the "base" when it's upside down.

If it's a silver unit I wouldn't put it upside down. Just have a look at the few number of threads of the screws that hold the heavy boards to the case: https://bitcointalksearch.org/topic/avalon-batch-2-damage-repaired-it-211928

If it's a black unit, I have seen messages that this issue has been solved.

-ck

legendary

Activity: 4088

Merit: 1631

Ruu \o/

Quote from: el_rlee on July 04, 2013, 07:36:58 PM

--avalon-auto seams working now, maybe I just was too impatient. I just don't get the results I wanted with my water cooling, frequency is on 354 now with the auto option. I am thinking of applying thermal paste to the back and an aluminum plate to the front which really presses the chips down onto the heatsink.

Heat's not the rate limiting thing for frequency it seems. In cold weather mine isn't getting hot but I can't get it up much past 355. The chips probably need a voltage mod to run at higher frequencies than that, but at least you've sorted out the heat side.

invader

sr. member

Activity: 266

Merit: 250

Quote

I was thinking about reworking the original heatsinks to fit on the top...

It's useless in general, too much work for too little effort. Better pay more attention to thermal contact of PCB bottom and heatsink. Also thanks for pictures, i noticed your chips is at 50 c, thats a good temperature - they will work fine up to 100c as was said somewhere. At least in datasheet i see operating temperature range [ -20 .. +85 ]

el_rlee

legendary

Activity: 1600

Merit: 1014

Quote from: invader on July 05, 2013, 02:58:42 AM

Quote from: BenTuras on July 05, 2013, 12:50:59 AM

Quote from: el_rlee on July 04, 2013, 07:36:58 PM

... and an aluminum plate to the front which really presses the chips down onto the heatsink.

It has been said many times not to put anything on top of the chips. You'll destroy them.

It was said because putting anything on chips would make air pass worse thru the aircooled unit and will decrease overall cooling efficiency. Also was noted that chips has bad thermal conductivity on top due to the air gap in chip package, so most of the heat is going to the bottom where is good thermal conductivity exist and then to pcb.

I was thinking about reworking the original heatsinks to fit on the top...

invader

sr. member

Activity: 266

Merit: 250

Quote from: BenTuras on July 05, 2013, 12:50:59 AM

Quote from: el_rlee on July 04, 2013, 07:36:58 PM

... and an aluminum plate to the front which really presses the chips down onto the heatsink.

It has been said many times not to put anything on top of the chips. You'll destroy them.

It was said because putting anything on chips would make air pass worse thru the aircooled unit and will decrease overall cooling efficiency. Also was noted that chips has bad thermal conductivity on top due to the air gap in chip package, so most of the heat is going to the bottom where is good thermal conductivity exist and then to pcb. But really, i think screws on PCB is just enough for purpose of "pressing to heatsink"

-ck

legendary

Activity: 4088

Merit: 1631

Ruu \o/

Mine has been upside down most of the time without a problem. It all looked pretty well secured when I opened it up and heat radiates from the "base" when it's upside down.

Topic: Avalon ASIC users thread - page 135. (Read 438596 times)