[ANN] Bitfury ASIC sales in EU and Europe - page 65.

goxed

legendary

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Bitcoin / Crypto mining Hardware.

Quote from: cscape on September 07, 2013, 12:38:43 PM

Quote from: tom99 on September 07, 2013, 11:38:09 AM

Dont you think better to change resistor R01F to Variable Resistor and we can player with it.

The resistor is in a regulation feedback path, so we don't want long wires that can influence stability of the control loop. Also, potentiometers are notoriously sensitive to wear and dirt.

Why do I measure the resistance of R01F and R02F as 1.3KOhm on the h-board, is it in parallel if other elements on Vout?

cscape

sr. member

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Quote from: tom99 on September 07, 2013, 11:38:09 AM

Dont you think better to change resistor R01F to Variable Resistor and we can player with it.

The resistor is in a regulation feedback path, so we don't want long wires that can influence stability of the control loop. Also, potentiometers are notoriously sensitive to wear and dirt.

eleuthria

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Quote from: -Redacted- on September 07, 2013, 11:55:55 AM

Quote from: mr_rulezzz on September 07, 2013, 11:32:58 AM

Quote from: dani on September 07, 2013, 11:15:24 AM

Both are working on eligius, 60gh @diff 128, 45gh @diff 64. I tried 256, but it fell down to 30gh for 2hours tonight.

diff 128 too much for 60gh i think ... 8-16 is nice.

I saw a statement (by ckolivas) that the diff you use should be roughly the nearest power of 2 to ( speed in Gh/s / 1,6 ). For 60 Gh/s, that divides out to 37,5 - so the diff you should be using would be about 32 (or 16 if you want to go one less.)

That's BTC Guild's recommendation, and it works out very well. There's a more precise calculation for pools that offer more difficulty precision, but most of them use powers of 2. The "nearest power of 2" method will put you right in the range that variable difficulty for most pools would adjust you to. Generally rounding down is preferred unless you're just shy of the next tier.

klondike_bar

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ASIC Wannabe

Quote from: integrity42 on September 07, 2013, 10:59:30 AM

BitFury and punin did a great job. They are heroes in the bitcoin community.

The bet is long over. Just confirming that a UNIT is whatever fits on a single M-board connected to a Raspberry-Pi.

And of course I have integrity. If I didn't, I would have created a second account to ask the question. I have nothing to hide.

your account has 16 posts, most of which focus on arguing/asking what consitutes a bitfury 'UNIT', which directly relates to a bitbet you lost.
(the bet was that bitfury would deliver on their promise to deliver units at 400Ghash and under 400w, by the end of august - They did, albeit adding a little extra hardware to compensate a rushed manufacturing process that wont occur again

-Redacted-

hero member

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Quote from: mr_rulezzz on September 07, 2013, 11:32:58 AM

Quote from: dani on September 07, 2013, 11:15:24 AM

Both are working on eligius, 60gh @diff 128, 45gh @diff 64. I tried 256, but it fell down to 30gh for 2hours tonight.

diff 128 too much for 60gh i think ... 8-16 is nice.

I saw a statement (by ckolivas) that the diff you use should be roughly the nearest power of 2 to ( speed in Gh/s / 1,6 ). For 60 Gh/s, that divides out to 37,5 - so the diff you should be using would be about 32 (or 16 if you want to go one less.)

tom99

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Quote from: cscape on September 07, 2013, 05:38:47 AM

For a more durable way to overvoltage the boards you should replace resistor R01F. The nominal value is 1.0K, and to increase the voltage the resistor needs to be replaced with one of a higher value.

A value of 1.5K is generally still safe, and should increase voltage from 0.65 to 0.7. If you want to go higher, you can try 2.2K or maybe even 3.3K if you feel lucky.

Of course, as punin said, this will void your warranty, and may break your card. Keep a close eye on the regulator temperature. Also, the resistor is in a somewhat tricky position to desolder, and you risk getting tin on the pins of the regulator.

The resistor should be 0603 size to fit properly on the pad. Also, I recommend a 1% type with low temperature coefficient. Resistors with high positive temperature coefficient may cause thermal runaway: as the resistor heats up, the voltage increases, causing the resistor to heat up even more.

Note: if you accidentally mess up the capacitor next to the resistor (C10F), and you wish to replace it, use 1nF, 50V, X7R type. Similarly, resistor R02F is 10k, 1%.

Dont you think better to change resistor R01F to Variable Resistor and we can player with it.

mr_rulezzz

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Activity: 61

Merit: 10

Quote from: dani on September 07, 2013, 11:15:24 AM

Both are working on eligius, 60gh @diff 128, 45gh @diff 64. I tried 256, but it fell down to 30gh for 2hours tonight.

diff 128 too much for 60gh i think ... 8-16 is nice.

dani

hero member

Activity: 525

Merit: 500

..yeah

..back on topic:

My unit still likes to perform bad when it feels like it. Currently it's 56gh instead of the usual 60-63 I got the last two days. It just drops the speed on two of three cards for like an hour or two and gets back to work. Sometime it helped to restart pi, change the best.cnf back to what I started with in the first place, sometimes not. I don't understand that hardware. I have always a fan slowly blowing air on the cards. The second miner (2nd pi, 2nd masterboard, 2hboards) does the same awkward thing. Both are working on eligius, 60gh @diff 128, 45gh @diff 64. I tried 256, but it fell down to 30gh for 2hours tonight.

punin, did you see that behaviour of chips/boards as well?

integrity42

full member

Activity: 476

Merit: 100

BitFury and punin did a great job. They are heroes in the bitcoin community.

The bet is long over. Just confirming that a UNIT is whatever fits on a single M-board connected to a Raspberry-Pi.

And of course I have integrity. If I didn't, I would have created a second account to ask the question. I have nothing to hide.

ssi

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Activity: 70

Merit: 10

Quote from: juhakall on September 07, 2013, 10:01:14 AM

Quote from: integrity42 on September 07, 2013, 08:02:34 AM

Hi punin, I was wondering what your definition of a 'unit' is?

i.e. Would anything that fits on 1M-board, attached to 1 Raspberry Pi be considered a unit?

i.e. if I order enough hardware to fit on 2M-boards, i'd have 2 units?

Thanks.

At least have the decency to say why you're asking this, mr. Integrity:

https://bitcointalksearch.org/topic/bitbet-incorrectly-declares-yes-to-a-no-bet-stay-away-from-bitbet-289316

Wow... that's pretty lame. No other vendor on here would have had the decency to supply extra hardware to prop up a performance shortage to the level promised, and you want to use that as a loophole to claim they haven't delivered what they advertised? integrity indeed.... Undecided

juhakall

sr. member

Activity: 658

Merit: 250

Quote from: integrity42 on September 07, 2013, 08:02:34 AM

Hi punin, I was wondering what your definition of a 'unit' is?

i.e. Would anything that fits on 1M-board, attached to 1 Raspberry Pi be considered a unit?

i.e. if I order enough hardware to fit on 2M-boards, i'd have 2 units?

Thanks.

At least have the decency to say why you're asking this, mr. Integrity:

https://bitcointalksearch.org/topic/bitbet-incorrectly-declares-yes-to-a-no-bet-stay-away-from-bitbet-289316

integrity42

full member

Activity: 476

Merit: 100

Hi punin, I was wondering what your definition of a 'unit' is?

i.e. Would anything that fits on 1M-board, attached to 1 Raspberry Pi be considered a unit?

i.e. if I order enough hardware to fit on 2M-boards, i'd have 2 units?

Thanks.

Cablez

legendary

Activity: 1400

Merit: 1000

I owe my soul to the Bitcoin code...

Is there any easy place to measure how much current each board takes so we can tailor a custom series of overclocked boards to keep under the 30A polyfuse?

eneloop

legendary

Activity: 1513

Merit: 1040

Quote from: rammy2k2 on September 07, 2013, 06:40:54 AM

all the starter kits have problems or just some ?
i will receive mine on monday and im a little scared of all the issues i have seen here ... is there a chance mine not to have problems ?

Mine is hashing at 43-45 GH/s out of the box (autotuning on). I had some issues using them in A1+B1, but in B1+C1 everything is fine.

Sitarow

legendary

Activity: 1792

Merit: 1047

Quote from: cscape on September 07, 2013, 05:38:47 AM

For a more durable way to overvoltage the boards you should replace resistor R01F. The nominal value is 1.0K, and to increase the voltage the resistor needs to be replaced with one of a higher value.

A value of 1.5K is generally still safe, and should increase voltage from 0.65 to 0.7. If you want to go higher, you can try 2.2K or maybe even 3.3K if you feel lucky.

Of course, as punin said, this will void your warranty, and may break your card. Keep a close eye on the regulator temperature. Also, the resistor is in a somewhat tricky position to desolder, and you risk getting tin on the pins of the regulator.

The resistor should be 0603 size to fit properly on the pad. Also, I recommend a 1% type with low temperature coefficient. Resistors with high positive temperature coefficient may cause thermal runaway: as the resistor heats up, the voltage increases, causing the resistor to heat up even more.

Note: if you accidentally mess up the capacitor next to the resistor (C10F), and you wish to replace it, use 1nF, 50V, X7R type. Similarly, resistor R02F is 10k, 1%.

rammy2k2

legendary

Activity: 1974

Merit: 1003

all the starter kits have problems or just some ?
i will receive mine on monday and im a little scared of all the issues i have seen here ... is there a chance mine not to have problems ?

cscape

sr. member

Activity: 251

Merit: 250

I don't know where to get them in small quantities. I get them as 5000 piece reels for 5 EUR from Farnell.

darkfriend77

sr. member

Activity: 434

Merit: 265

a damn i have now a pencil in hand ...

... isn't the freestyle way just to .. rub 2 times over the R02F

... and go?

-Redacted-

hero member

Activity: 574

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So @cscape - where can an average guy go to purchase a 1.5K 0603 resistor in onesie-twosie quantities? I'm sure we can buy them for 0,01 somewhere but the shipping is going to be 1.000 times more than the part...

achimsmile

legendary

Activity: 1225

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Pencil mod FTW!!

Noncerate: 56.951GH/s

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