Avalon ASIC users thread - page 150.

loshia

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Quote from: elasticband on June 27, 2013, 05:06:56 PM

a tip to anyone who can find me replacement fans in the EU....... 36000 - 4000 rpm 120mm x 38mm

It is useless dude believe me, and main point is with air it needs to circulate. Which means that if fans are too strong compared to two fan holes for air out you do nothing, because pressure is too big.

If you are keen on fans better idea is to install it in the right hole in th back near psu to suck hot air out

elasticband

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a tip to anyone who can find me replacement fans in the EU....... 36000 - 4000 rpm 120mm x 38mm

loshia

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Quote from: elasticband on June 27, 2013, 04:58:46 PM

ok cool

why do batch 2 not have this issue?

Because three fans are equal int therms of RPM i guess

But it does not mean that it does not has issue. third fan is useless when power supply is inside. just my opinion. It shall cool of the PSU but there are too many wires before air reaches the PSU. That is what i am thinking.

Do what i did it is ugly wires and sensors outside but it works and PSU gets better cooling when it is outside. I changed stock 650W PSU and when i tried to close the box i just do not have the guts to stick all psu cables inside, which force me to do all this little by little

elasticband

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Quote from: elasticband on June 27, 2013, 04:58:46 PM

ok cool

why do batch 2 not have this issue?

gonna have a play with a batch 1

elasticband

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ok cool

why do batch 2 not have this issue?

Sitarow

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Quote from: elasticband on June 27, 2013, 04:53:25 PM

Quote from: Sitarow on June 27, 2013, 04:43:21 PM

Quote from: elasticband on June 27, 2013, 04:35:29 PM

finding these in the EU is proving to be a struggle.... ordering from aamzon.com will be 20-30days delivery Sad

The problem is that there is too much pressure inside the unit.

The two holes in the back of the unit are not adequate to move the increased cfm of air being moved.

A quick fix would be to remove the power supply from inside the Avalon and having placed on top or beside of the unit.

This will permit for more CFM of air to be pushed out the back and enabling the blue fan to operate at 2300 rpm's

It may not solve the display problem however it will solve the underlying issue.

You can tell that your "Blue" fan is not spinning at its max speed when the temp sensor on the controller reports high temps of 28+

so the blue fan only opperates at 2300 rpm's? is this it's max? so replacing with a 3000rpm will be good? and better for CFM when black fans are on 4000RPM?

The problem is that the you need 1 more hole in the back in order to move the cfm of air out of the unit.

This is the issue even if you were to get another black fan running at 3600-4000rpm.

elasticband

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Quote from: Sitarow on June 27, 2013, 04:43:21 PM

Quote from: elasticband on June 27, 2013, 04:35:29 PM

finding these in the EU is proving to be a struggle.... ordering from aamzon.com will be 20-30days delivery Sad

The problem is that there is too much pressure inside the unit.

The two holes in the back of the unit are not adequate to move the increased cfm of air being moved.

A quick fix would be to remove the power supply from inside the Avalon and having placed on top or beside of the unit.

This will permit for more CFM of air to be pushed out the back and enabling the blue fan to operate at 2300 rpm's

It may not solve the display problem however it will solve the underlying issue.

You can tell that your "Blue" fan is not spinning at its max speed when the temp sensor on the controller reports high temps of 28+

so the blue fan only opperates at 2300 rpm's? is this it's max? so replacing with a 3000rpm will be good? and better for CFM when black fans are on 4000RPM?

loshia

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Quote from: Sitarow on June 27, 2013, 04:45:05 PM

Quote from: loshia on June 27, 2013, 04:40:06 PM

Quote from: dogjunior on June 27, 2013, 04:23:14 PM

Thanks. Just ordered a fan off of Amazon. Not seeing the rpm in cgminer kind of bugs me.

Dude,
What i did.
1. Removed PSU outside - Ugly hack
2. The PSU hole was sealed to avoid air out
3. The blue fan unplugged/disconnected
4. Tmp sensor mounted outside
5. Blue fan hole sealed to avoid air out

Result:

All temps went down 3-4 degrees Ambient stays constant air conditioned
Result with latest FW - auto-clock between 357-361

Difficulty Accepted:118964.00000000 1191.43/m 85285.68Mhs ACCEPTED BY THE POOL
Up time: 1h 39m 51s

And I am Happy Thanks CON!!!

Nice and good results also risky leaving it on auto

but nice results non the less

Yeah I know....It may go up to 450 who knows Cheesy

It will run for a few more hours and i will leave it at 355 probably

Sitarow

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Activity: 1792

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Quote from: loshia on June 27, 2013, 04:40:06 PM

Quote from: dogjunior on June 27, 2013, 04:23:14 PM

Thanks. Just ordered a fan off of Amazon. Not seeing the rpm in cgminer kind of bugs me.

Dude,
What i did.
1. Removed PSU outside - Ugly hack
2. The PSU hole was sealed to avoid air out
3. The blue fan unplugged/disconnected
4. Tmp sensor mounted outside
5. Blue fan hole sealed to avoid air out

Result:

All temps went down 3-4 degrees Ambient stays constant air conditioned
Result with latest FW - auto-clock between 357-361

Difficulty Accepted:118964.00000000 1191.43/m 85285.68Mhs ACCEPTED BY THE POOL
Up time: 1h 39m 51s

And I am Happy Thanks CON!!!

Nice and good results also risky leaving it on auto

but nice results non the less

Sitarow

legendary

Activity: 1792

Merit: 1047

Quote from: elasticband on June 27, 2013, 04:35:29 PM

finding these in the EU is proving to be a struggle.... ordering from aamzon.com will be 20-30days delivery Sad

The problem is that there is too much pressure inside the unit.

The two holes in the back of the unit are not adequate to move the increased cfm of air being moved.

A quick fix would be to remove the power supply from inside the Avalon and having placed on top or beside of the unit.

This will permit for more CFM of air to be pushed out the back and enabling the blue fan to operate at 2300 rpm's

It may not solve the display problem however it will solve the underlying issue.

You can tell that your "Blue" fan is not spinning at its max speed when the temp sensor on the controller reports high temps of 28+

loshia

legendary

Activity: 1610

Merit: 1000

Quote from: dogjunior on June 27, 2013, 04:23:14 PM

Thanks. Just ordered a fan off of Amazon. Not seeing the rpm in cgminer kind of bugs me.

Dude,
What i did.
1. Removed PSU outside - Ugly hack
2. The PSU hole was sealed to avoid air out
3. The blue fan unplugged/disconnected
4. Tmp sensor mounted outside
5. Blue fan hole sealed to avoid air out

Result:

All temps went down 3-4 degrees Ambient stays constant air conditioned
Result with latest FW - auto-clock between 357-361

Difficulty Accepted:118964.00000000 1191.43/m 85285.68Mhs ACCEPTED BY THE POOL
Up time: 1h 39m 51s

And I am Happy Thanks CON!!!

elasticband

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Nighty Night Don't Let The Trolls Bite Nom Nom Nom

finding these in the EU is proving to be a struggle.... ordering from aamzon.com will be 20-30days delivery Sad

dogjunior

sr. member

Activity: 407

Merit: 255

Thanks. Just ordered a fan off of Amazon. Not seeing the rpm in cgminer kind of bugs me.

Sitarow

legendary

Activity: 1792

Merit: 1047

Quote from: dogjunior on June 27, 2013, 03:55:18 PM

This is a dumb question

Two of the three fans in my Avalon are spinning at 3700 plus RPM. The first one (blue guy) is at 0 RPM. Is that because it is not at 12v 3600 rpm fan? It is running but cgminer is not reading the fan speed. It there a way to fix it?

https://bitcointalksearch.org/topic/m.2595244

read that post

should help answer your question.

irritant

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Activity: 473

Merit: 250

Sodium hypochlorite, acetone, ethanol

Quote from: dogjunior on June 27, 2013, 03:55:18 PM

This is a dumb question

Two of the three fans in my Avalon are spinning at 3700 plus RPM. The first one (blue guy) is at 0 RPM. Is that because it is not at 12v 3600 rpm fan? It is running but cgminer is not reading the fan speed. It there a way to fix it?

I heard it was normal, when the two fans spin at max rpm, the third fan spins less or stops spinning, maybe because of the airflow coming from the other two

dogjunior

sr. member

Activity: 407

Merit: 255

This is a dumb question

Two of the three fans in my Avalon are spinning at 3700 plus RPM. The first one (blue guy) is at 0 RPM. Is that because it is not at 12v 3600 rpm fan? It is running but cgminer is not reading the fan speed. It there a way to fix it?

Sitarow

legendary

Activity: 1792

Merit: 1047

Update on Avalon set at 340 speed.

200760 accepted shares submitted over 180 minutes = 1115.3 shares per minute or 66920 accepted shares per hour.

Will run for 1 full day in order to compare vs 345 setting on new firmware.

loshia

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Activity: 1610

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Quote from: fhh on June 27, 2013, 11:11:23 AM

Quote from: loshia on June 27, 2013, 10:21:13 AM

710 Watt is measured at the wall (plug/input). PSU has about 80% efficiency which means that 4 Modules will consume about 757W (710*0.8/3*4) at OUTPUT. PSU is rated what it can supply in OUTPUT not what it consumes in input. If you measure 4 modules at Input (plug) you will see that they will consume about 757 +0.2*757 = 908W

So once again 850W rated PSU is fine

Just to be on safe side check what is max Amparage that 12V rail can provide. It has to be greater than 757/12=63Amps. Most modern PSU's will do that. Having 1000W psu with weak 12V rail < 63AMPS (just an example) will cause magic smoke to come out

In short watch PSU Output Wats + !!!!!12v Rail AMPS!!!!!

The AX860 is a 80+ platinum rated psu what means it has an efficiency of over 90% (94% @50% load and still 91% on 100% load) @ 230V
(115V is a little worse) check it out: http://www.plugloadsolutions.com/80PlusPowerSupplies.aspx#

So the estamined 950 @wall will be about 860 Watt output and thats exactly the limit Sad

I think Corsair is a good psu so it might have some reserve BUT I wont run a psu 24/7 at its limit!

When I calculate the output 710*0.92 = 653 output /3*4 I'll get 870 Watt with 4 modules
maybe it would work for a while but its very risky

or will you loshia give a guarantee for your YES promise???

Dude, I am not able to promise you anything. i missed the fact that the measurement is with gold PSu at 115V.

What i think is that:
Al PSu suppliers lie and or efficiency drops when psu load is > 85%. So let us make a bargin and count it has 85% efficiency. Have in mind that you have at least 10% additional loss by converting 12V to 1.2V right?

So calculation is almost same. However i do recommend to chose as powerful as you can afford with at least 75A - 12V

Best

elasticband

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the 860w not 860i is 71.6A

Rail   3.3V   5V   12V   5VSB   -12V
Max. Power   25A   25A   71.6A   3A   0.6A
125W   859.2W   15W   6W
Total Max. Power   860W

loshia

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Quote from: gyverlb on June 27, 2013, 02:11:09 PM

Quote from: fhh on June 27, 2013, 11:11:23 AM

When I calculate the output 710*0.92 = 653 output /3*4 I'll get 870 Watt with 4 modules
maybe it would work for a while but its very risky

I wouldn't be comfortable with this setup either, but to be fair you forgot to note that there's probably 30 to 50W used to power the rest of the system (fans, controller, mips board, hub, ...) so it's probably still within the PSU specs.

DNS died so i was not able to finish my post Wink

About Fans + other things they get calculated already. What i forgot to write is that psu should be single 12V rail capable to provide at least 63A+10%-15% reserve or to be driven at 85% load=70AMps+ 860i is rated at 71A so it should be fine. However 75A+ would be the one i will choose Wink

So that is pretty much all of it

Topic: Avalon ASIC users thread - page 150. (Read 438516 times)