Im not entirely sure, but I'd say that chip 38 is dead and since they are chained any chips beyond it will not function.

In my (limited) experience there is no sweet spot between 1 and 10+ errors. I've only been raising the speed on chips that constantly have 0 errors. This ofcourse is something that should be discussed more. Whats the efective hashing speed gain when raising one chip by 1 ? ..and subsequently whats the error persentage that justifies the gain ?

I would collect a sample on it myself, but am for now in the middle of trying to find a correlation between temperature, noncerate and errors.

Over irc I've seen the cgminer development gradually progressing over the past few days, I suppose punin (and others?) are "going at it" allready.

I'd like to add that I did not have this issue with bitminter and that my board came with the software fully installed unlike the op's board.

Well firstly I mean turning autotune off, that's a typo.

I let the harware run for about 24h, grabbed the best.log and copied it as follows:

And started manually changing the speeds in /opt/bitfury/best.cnf based on a large number of results with 5 or more minute intervals, thus using a new .stat.log every time. The log only holds a five minute sample, so I collected a large number of notes on each chip using paper and pen. When a chip constantly had 0 errors I pushed it's speed higher and when a chip constantly showed over 10% errors I lovered it. I also re-enabled a bad chip that autotune had shut down, it's not working properly, but is producing 2/3 valid shares without interfering with the other chips, using a speed of 52.

All other chips are now between 54 and 56 speed, 57 was a now go on every chip because of the hightened error rate.

The final modifications (so far) were made based on 20 samples and I believe that this is optimal for now, I will propably try altering the operating temperature next, with a modifiable make-shif enclosure and see where that leads me.

I am by far not sure the 10% rule is optimal, someone else will propably figure out the optimal number there.

The results of my current settings measured from poolside over 6 shifts (9h) put my hashrate with only the 2-board starter kit at 50,68 Gh/s.

The basics are covered in http://punin.com/README_BFSB_v0.1.txt
Please note that everything does not apply for the kits your getting, you will have a preinstalled image on the sd card.
But what does apply is how to read the logs and configs and how to modify the latter.

To put it short, I disabled autotune after a 24h run for all chips and used the best run generated as a starting point. I tuned the chips based on about 50 5 minute runs, rising the speed of a chip if it had 0 errors and lowering it if it had 10% or more. Takes forever and is anal as hell.. most of you guys will love doing this .

Thanks for ruining the forums for everyone.

It's 4 hours yous should spend reading the forums. The time is in place partially to protect the forums having the same questions asked tens of thousands of times, when the search function is there for that. Not that it's really working. But you could for example read up on address collision before you think of this risk and decide to ask about it.  

I can confirm that the boards really do not seem to like cooling. Im even partially blocking any natural air-movement to them and have achieved the best results seen thus far:
speed": 1766, "noncerate": 50.967, "noncerateperchip":1.593, "hashrate":52.690, "good":3560, "errors":148, "spi-errors":2, "miso-errors":0, "jobs":375, "record":50.924

Which translates in to a constant average hashrate of just under 49,5 Gh/s.

[edit]
In should propably in all fairness also say that achieving this also required turning the autotune off and hand tuning the chips for about two working days... the problem with 5 minute samples is that you do need a lot of them to make the right adjustments.

100 of those would produce 6600Mhs, with the current difficulty 6600Mhs produces 0.05Btc / 24h. Im having a hard time believing one could purchase the VPS's that cheap.

Ok, you propably should check this to see how different cpu's fare in mining. Perhaps it will convince you of how it is not viable:
https://en.bitcoin.it/wiki/Mining_hardware_comparison#CPUs.2FAPUs

Shameless self promotion:

Youll propably need one of these now.

They were dead long before that announcement, I suspect your confused with the units Mhs, Ghs and Ths to even consider this. Also I also do regard you as a botnet operator or leaser.

I also need a clue, guessing metabank bitfury's ?
Bah! Im blind, it's vodka, lots of it.

Mentioned on irc.

So you should buy mining equipment that is a generation old, because you have cheap electricity. Makes sense.. or not, Im not trying to put anyone off from mining here. I'd just like to see people making informed decisions based on promises that are kept.

Glad you like it, the pvc keychain originates from somewhere in mainland China.

Excuse me but isnt this new divident payment only accumulating dust to my pico stocks account, costing a buttload in tx-fees when I want to move it ?

It's funny how people still prefer the units over their money back. I suggest some math and taking a look at the difficulty development over the past months as a comparison.

bump