Avalon ASIC users thread - page 98. | Bitcointalksearch.org

GenTarkin

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Quote from: lastbit on August 15, 2013, 07:38:59 PM

Quote from: GenTarkin on August 15, 2013, 07:35:27 PM

1.3v ... wont that kill the VR? ... like was stated we are at 17-18amps already and it handles 20amps...

From where was the info that it can handle only 20?

I dont know where the links to the schematics are anymore... but, it was when I Was reading them. I looked up the main VRM controller chip(fuck if I know what its called) and as per the manufacturers specification the max amps out was like 20amps...

lastbit

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Quote from: GandalfG on August 15, 2013, 06:46:11 PM

Quote from: S M I L Y on August 15, 2013, 05:43:40 PM

Thanks lastbit!

Ill just pull the spec sheet for the controller.

Ill probably just drop to a 6k resistor and a 10k pot in series till I can figure out what voltage it takes to get to 400mhz.

Avalon chip spec shows 1.2v typical 1.32 max!

I wonder if I can shut off all of the individual modules except for the one Im working on.

For 1.3V simple add 47k resistor parallel to R10 (10.5k) - pin2 U1 to GND
Unfortunately you have to do for each sub-module 24 or 32 Sad

Work on 395MHz 1.2% HW

Indeed 47k in parallel would give ~1280mV, a 11% increase over default.
Assuming chips are able to take also 11% more frequency, you'll need a ~40% more powerful PS, i.e. 1200W for 4 modules.
Not very power efficient Sad

lastbit

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Quote from: lastbit on August 15, 2013, 06:37:34 PM

Quote from: S M I L Y on August 15, 2013, 05:43:40 PM

Thanks lastbit!

Ill just pull the spec sheet for the controller.

Ill probably just drop to a 6k resistor and a 10k pot in series till I can figure out what voltage it takes to get to 400mhz.

Avalon chip spec shows 1.2v typical 1.32 max!

I wonder if I can shut off all of the individual modules except for the one Im working on.

By module I assume you mean a group of 10 asics with common VR.
Each of the big module is connected with 40pin. I believe you can visually and ohmmeter check what pins go to each group and make a custom ribbon cable with only that signals. And of course disconnect the other big modules.

@S M I L Y
I found module backplane schematics. Indeed each group is connected with 4 signals (2 in, 2 out).

lastbit

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Quote from: GenTarkin on August 15, 2013, 07:35:27 PM

1.3v ... wont that kill the VR? ... like was stated we are at 17-18amps already and it handles 20amps...

From where was the info that it can handle only 20?

GenTarkin

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1.3v ... wont that kill the VR? ... like was stated we are at 17-18amps already and it handles 20amps...

GandalfG

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Dig your freedom

Quote from: S M I L Y on August 15, 2013, 05:43:40 PM

Thanks lastbit!

Ill just pull the spec sheet for the controller.

Ill probably just drop to a 6k resistor and a 10k pot in series till I can figure out what voltage it takes to get to 400mhz.

Avalon chip spec shows 1.2v typical 1.32 max!

I wonder if I can shut off all of the individual modules except for the one Im working on.

For 1.3V simple add 47k resistor parallel to R10 (10.5k) - pin2 U1 to GND
Unfortunately you have to do for each sub-module 24 or 32 Sad

Work on 395MHz 1.2% HW

lastbit

full member

Activity: 206

Merit: 100

Quote from: S M I L Y on August 15, 2013, 05:43:40 PM

Thanks lastbit!

Ill just pull the spec sheet for the controller.

Ill probably just drop to a 6k resistor and a 10k pot in series till I can figure out what voltage it takes to get to 400mhz.

Avalon chip spec shows 1.2v typical 1.32 max!

I wonder if I can shut off all of the individual modules except for the one Im working on.

By module I assume you mean a group of 10 asics with common VR.
Each of the big module is connected with 40pin. I believe you can visually and ohmmeter check what pins go to each group and make a custom ribbon cable with only that signals. And of course disconnect the other big modules.

WinTame2012

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Activity: 315

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Official sponsor of Microsoft Corp.

Moved from bitparking to 50btc and now I'm constantly getting a lot of Rejected shares at Diff8 Huh

Does anybody have fixed issue like this?

Edit: FW both 20130703 and 20130723

-ck

legendary

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Ruu \o/

Quote from: GenTarkin on August 15, 2013, 12:14:40 PM

How is MHSav calculated? Is it based off valid diff1 work?
Meaning HW errors is already accounted for in MHSav?

By my calculations based on clockspeed, looks like it does account for HW% error.

Also does --avalon-temp clock down regardless if --avalon-auto is used or not? Also, how does that relate to --avalon-freq if setting it to one value... will --avalon-temp still clock down?

MHSav is calculated from valid diff1work and does not count hw errors.
Avalon temp works regardless.
Avalon freq is the frequency range that avalon auto will use and ignores temperature unless it is over the optimal range - then it will clock down if the fans can't keep it down.

S M I L Y

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https://www.chynge.net/

Thanks lastbit!

Ill just pull the spec sheet for the controller.

Ill probably just drop to a 6k resistor and a 10k pot in series till I can figure out what voltage it takes to get to 400mhz.

Avalon chip spec shows 1.2v typical 1.32 max!

I wonder if I can shut off all of the individual modules except for the one Im working on.

lastbit

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Activity: 206

Merit: 100

Quote from: S M I L Y on August 15, 2013, 04:22:26 PM

Quote from: lastbit on August 15, 2013, 04:16:34 PM

Quote from: S M I L Y on August 15, 2013, 04:10:12 PM

@lastbit.

Have you reworked a VR with the 1.5uH? How much current have you been able to push?

I haven't. I have to solve cooling first. I hope next week.

Im in the process of watercooling mine. Should be done next week as well. I plan on switching out the sense resistors(R10 i believe) on the VR to get to 1.2v.

Where can I find the schematics for this thing?

Question more difficult than I believed Sad

I have downloaded pdfs from somewhere, I believe it was from github. Unfortunately now I'm only finding this: https://github.com/BitSyncom/avalon-ref. Unfortunately files are in "ALTIUM DESIGNER" format.

R10 is 10.5k, connecting pin2 (FB) of TPS40193 to GND.

S M I L Y

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https://www.chynge.net/

Quote from: lastbit on August 15, 2013, 04:16:34 PM

Quote from: S M I L Y on August 15, 2013, 04:10:12 PM

@lastbit.

Have you reworked a VR with the 1.5uH? How much current have you been able to push?

I haven't. I have to solve cooling first. I hope next week.

Im in the process of watercooling mine. Should be done next week as well. I plan on switching out the sense resistors(R10 i believe) on the VR to get to 1.2v.

Where can I find the schematics for this thing?

lastbit

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Does anybody know if it's possible of not to clock each module independently?

lastbit

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Quote from: S M I L Y on August 15, 2013, 04:10:12 PM

@lastbit.

Have you reworked a VR with the 1.5uH? How much current have you been able to push?

I haven't. I have to solve cooling first. I hope next week.

cypherdoc

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hmmm, anyone ever see this?:

S M I L Y

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https://www.chynge.net/

@lastbit.

Have you reworked a VR with the 1.5uH? How much current have you been able to push?

lastbit

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So, here is my first step in overclock batch#3 quest.

I have took out back panel. To much of my surprise, temperature droped 2C !!!
With original fans=100%, @358MHz:
Avalon unit as it came: 24/66/46
Back panel removed: 24/64/45
I have put, as a proof of concept, some pieces of cardboard to force air through fins and at the surface of the boards, especially at the output region of modules. I have also obstructed air path above the modules (where modules cables connect to modules).
No back panel and some cardboard: 24/59/44.
I'd say a success!

Unfortunately this did not help at all regarding frequencies. Still 8%HW errors @375Mhz (like before).

I also think about replacing thermal pad with thermal paste. I have noticed PCB "bulges" between the screws, so I believe thermal contact is less than optimal with the pad:

I have also noticed modules are not parallel. they are slightly tilted, as you can see in the first image. If I would separate the twin connector PCB (for two modules), problem would be solved. I'll do it anyway when I'll work on modules to have only one module stopped at a time. But I believe it's not so important.

lastbit

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Quote from: GenTarkin on August 15, 2013, 11:09:14 AM

Can a voltage increase be safely done w/o drawing to much current through the power circuitry? Cuz they are only rated for something like 20 amps, and I thought at default voltage / clocks we are pushing pretty close to that....

Around 17-18 Amps @350Mh/s and 1150mV I reckon. Transistors are not a problem. Inductor seems to be more closer to the limit. In schematics it's 1uH. But on board I have 1.5uH, which might be specified at only 27A.
Anyway, I'm willing to take the risk of 25% more power.

ProfMac

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Quote from: thejestre on August 15, 2013, 12:12:11 PM

Quote from: ProfMac on August 15, 2013, 11:13:26 AM

Updated: [Firmware Version] => 20130814
about 9:00 AM CDT today.
I am watching the pool statistics reported by eligius.

No opinion yet, I'll let it run for a while.
My temp1 runs about 20-22°C, my ambient temp in the basement runs 65-68°F.

I think I done fcked myself a bit with firmware Sad

, but not too bad.

Had some _really_ strange experiences flashing to 20130813-1 then trying to go back to 20130703. Let's just say things were kind of strange - made sure to NOT check the "keep settings" box, but settings were held over.

Anyway Prof, looks like your hashes are nicer than mine right now. Mind posting the changes you made after you flashed to 20130814 [options set, flags, etc]? I might try that firmware when I get home tonight, my Avalon is hashing around 70 Gh/s right now, and that feels a bit slow, considering it was closer to 80 before I mucked things up by trying to "fix" it. Although I just read ck's comment about hash rate being more marketing than power.

Interested to see others' results.

Thanks,

_theJestre

I kept the old settings. My file /etc/config/cgminer is very similar to the following. I am set to fail-over, not balance, but I don't see that interpretation reading this file. I usually have the chip frequency option set very low, perhaps 256, because the fans stop for a while when I reset things, and I want to stop building up heat.

Code:

config cgminer 'default'
option pool_balance ' '
option pool1pw 'none'
option api_allow 'W:127.0.0.1,192.168.0.0/24'
option pool1url 'stratum+tcp://mining.eligius.st:3334'
option pool1user '18bLcVkviErQi75zB8X39jZXxHNpSZggdC'
option miner_count '24'
option more_options '--avalon-auto --avalon-freq 256-350 --avalon-temp 50'
option chip_frequency '347'

GenTarkin

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Activity: 2450

Merit: 1002

How is MHSav calculated? Is it based off valid diff1 work?
Meaning HW errors is already accounted for in MHSav?

By my calculations based on clockspeed, looks like it does account for HW% error.

Also does --avalon-temp clock down regardless if --avalon-auto is used or not? Also, how does that relate to --avalon-freq if setting it to one value... will --avalon-temp still clock down?

Topic: Avalon ASIC users thread - page 98. (Read 438596 times)