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21  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 25, 2013, 02:42:50 AM
What value resistor would I piggyback onto R10 to target 1.30V, or 1.25V?
For 1.3V (1.278V under load) I use 47k. No problem with 400MHz and 0.98% HW, Rejected 0.38%
For stability I suggest sold 2mm2 wire from coil to the end of board. Top cooper layer (VDD_1.2)  is too thin to carry such high currents.
Look on the picture below
https://www.dropbox.com/s/68f6k5tafw1i58f/20130825_025617-2.jpg



Im running with 31k piggyback and that gives me 1.336v under load at the bottom chip.

Be aware that for me at 460mhz I am 2x the wattage as a stock Avalon!   At bare MINIMUM you need a 1200watt powersupply for a 4 module unit!

I need to find out how to deal with 1600watt total at 460mhz!!!
22  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 25, 2013, 12:51:05 AM
What value resistor would I piggyback onto R10 to target 1.30V, or 1.25V?

https://bitcointalk.org/index.php?topic=140539.msg2660290#msg2660290

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.
23  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 11:13:23 PM

Where you located? So, what do you think 1.3v @ chips would yeild, at least 400?
Also, I have upgraded the fans in the unit to 2x 5k RPM 250cfm .. Currently the avy temps read maybe 45C during day time and 35C @ night.... I know this is cooler than the chips themselves but much better than stock cooling. Do you think that would cut it?

Just did quick test of 375mhz ... stable but 6.5% HW error ... think just doin wire mod will bring that down to 2%? =)

Im in Texas.   1.3v should have no problem with 400.   Im only at 1.336 and getting 460mhz. 

As for cooling:  If you do good thermal paste on the backside and are in a cool environment you may get away with just air cooling.
24  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 09:23:22 PM

have any idea what thats good to or is there no spec for that?
Also, feel like doin this to anyone elses avy? =P

Id have to look up the spec on the inductor.

I would be willing to do the electrical stuff for a BTC or 2.   

The watercooling stuff you are on your own.  TIG welding the shitty extruded aluminum is a pain in the ass! 

But then again if you want this done bad enough I suppose Id do it all for a price...  Make me an offer I cant refuse  Smiley

I suppose Id sell my unit for the right price as well.   140ghs fastest Avalon on the planet Smiley

 
25  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 09:05:21 PM
Yea Im impressed with the VRs on this thing!!!  Im running 1.336v measured under load.   The sense resistor is set to 1.43v

Im going to have to hook up a 2nd 12v supply!

I wonder what the Power distribution board in the Avalon can handle??!??!

So, if you had to guess, what would be the most limiting piece on the VRM section before something burns out...

Assuming you keep things cool...  Inductor reaching its saturation point would bring the party to an end.
26  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 08:53:32 PM
Yea Im impressed with the VRs on this thing!!!  Im running 1.336v measured under load.   The sense resistor is set to 1.43v

Im going to have to hook up a 2nd 12v supply!

I wonder what the Power distribution board in the Avalon can handle??!??!
27  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 08:36:37 PM
OK... Just hooked my Watt Meter to to the 460Mhz overclocked 2 module unit and it is pulling 855watt at the wall!!!

 Shocked Shocked Shocked Shocked Shocked Shocked Shocked Shocked Shocked Shocked Shocked Shocked Shocked

I only have a 1200 watt power supply!!!  I will have to add a 2nd power supply or downclock when I add the 2nd two modules!
28  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 05:01:59 PM


You cant software set avalons voltage... they have to be hardmodded for voltage...
How hardmodded?

here is a bit of what i have done.  I will do a full writeup once i get everything put together.

https://bitcointalk.org/index.php?topic=271575.msg2968737#msg2968737

29  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 02:26:19 AM

Right so...

Like I implied a few quotes back. See what it gets to with with just those settings.




PMed you.  Lets take this offline till things get working.

Thanks again!
30  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 02:15:50 AM
Frequency field set to 450 with Options at --avalon-auto <  WORKS

Bump frequency field to 451 < DEAD waited at least 5 minutes.  API log shows "Socket connect failed: Connection refused"
Did you try it with --avalon-auto without other parameters? It might just be the web interface that doesn't allow it.
Meaning the web interface has a 450 limit even if cgminer doesn't. See what it gets to with auto without any other parameters?

Blank Freq field  with --avalon-auto and nothing else < DEAD
I did NOT say blank freq lol this is crazy. Use your previous settings, set 450 in frequency and then just add --avalon-auto to MoreOptions
31  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 02:11:24 AM
Frequency field set to 450 with Options at --avalon-auto <  WORKS

Bump frequency field to 451 < DEAD waited at least 5 minutes.  API log shows "Socket connect failed: Connection refused"
Did you try it with --avalon-auto without other parameters? It might just be the web interface that doesn't allow it.
Meaning the web interface has a 450 limit even if cgminer doesn't. See what it gets to with auto without any other parameters?

Blank Freq field  with --avalon-auto and nothing else < DEAD
32  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 01:57:46 AM
There is no reason it wouldn't start with the same settings you used previously. Try those first, and then add just --avalon-auto to the More Options box. Sometimes people are impatient and it can take it up to 2 mins before you start seeing the output from cgminer.

Its definitely not working.  with the Main frequency field at 440 and the Options field as "--avalon-auto --avalon-freq 440-455 --avalon-fan 50"  
Waited for at least 5 min here.

Adjusted only the "--avalon-freq 440-455"  down to "--avalon-freq 440-450" and the system starts within 30sec.

Is the an SSH command line only method I could try?
Edited, kept highlighting wrong part.

Frequency field set to 450 with Options at --avalon-auto <  WORKS

Bump frequency field to 451 < DEAD waited at least 5 minutes.  API log shows "Socket connect failed: Connection refused"

33  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 01:39:22 AM

Did you try it with --avalon-auto without other parameters? It might just be the web interface that doesn't allow it.

In the web GUI in the "Chip Frequency(Default: 300)" field Is where I have been setting the frequency.

The only "More options" I have set is "--avalon-fan 50"
Try what I suggested, and put your range you're interested in More Options as well: --avalon-auto --avalon-freq 450-500 or something

Still doesn't work

More options:  --avalon-auto --avalon-freq 450-465 --avalon-fan 50

What am I supposed to do with the main frequency field?   Both with Blank and 450mhz the system doesn't start.
There is no reason it wouldn't start with the same settings you used previously. Try those first, and then add just --avalon-auto to the More Options box. Sometimes people are impatient and it can take it up to 2 mins before you start seeing the output from cgminer.

Its definitely not working.  with the Main frequency field at 440 and the Options field as "--avalon-auto --avalon-freq 440-455 --avalon-fan 50" 
Waited for at least 5 min here.

Adjusted only the "--avalon-freq 440-455"  down to "--avalon-freq 440-450" and the system starts within 30sec.

Is the an SSH command line only method I could try?
34  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 01:05:52 AM

Did you try it with --avalon-auto without other parameters? It might just be the web interface that doesn't allow it.

In the web GUI in the "Chip Frequency(Default: 300)" field Is where I have been setting the frequency.

The only "More options" I have set is "--avalon-fan 50"
Try what I suggested, and put your range you're interested in More Options as well: --avalon-auto --avalon-freq 450-500 or something

Still doesn't work

More options:  --avalon-auto --avalon-freq 450-465 --avalon-fan 50

What am I supposed to do with the main frequency field?   Both with Blank and 450mhz the system doesn't start.
35  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 12:53:19 AM

Did you try it with --avalon-auto without other parameters? It might just be the web interface that doesn't allow it.

In the web GUI in the "Chip Frequency(Default: 300)" field Is where I have been setting the frequency.

The only "More options" I have set is "--avalon-fan 50"
36  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 24, 2013, 12:42:52 AM
Yes perfectly stable .49% hw error at 41c Batch3

could you lift that 450 limit easily?

Thanks!
There's a special one-off firmware just for you that lifts the limit to 1000 here:
http://ck.kolivas.org/apps/cgminer/temp/

This firmware isnt working past 450.

CGMiner API log shows:

[Firmware Version] => 20130824
cgminer-bdac063+
luci-d854edc+
cgminer-openwrt-packages-800cc58
Socket connect failed: Connection refused


Thanks again for all your work!



37  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 23, 2013, 11:06:19 PM
Yes perfectly stable .49% hw error at 41c Batch3

could you lift that 450 limit easily?

Thanks!
There's a special one-off firmware just for you that lifts the limit to 1000 here:
http://ck.kolivas.org/apps/cgminer/temp/


AWESOME!!  THANK YOU!!!
38  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 23, 2013, 02:55:33 PM
Yes perfectly stable .49% hw error at 41c Batch3

could you lift that 450 limit easily?

Thanks!

How many GH/s are you getting at 450? Three or four modules unit?

spiccioli



At the moment I am running only 2 modules while i finish the waterblocks on the other 2.   Im showing 71Ghs on 2 modules at 450Mhz.   BTCGuild is showing exactly 75Ghs

39  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 23, 2013, 06:09:12 AM
Yes perfectly stable .49% hw error at 41c Batch3

could you lift that 450 limit easily?

Thanks!
40  Bitcoin / Hardware / Re: Avalon ASIC users thread on: August 23, 2013, 05:13:48 AM
@ckolivas   Are you doing anything to cap the system at 450Mhz?   Im running stable at 450 but as soon as I bump to 451Mhz it fails to start mining?

PS: I am running at 1336mv and watercooled...


Thanks!
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