This sounds good. So when a chip fully stops working all others remain working.
If one chip
fully stops working and does not forward messages, all chips from that defective one to the end of that row will not function.
If that defective chip still forwards messages, only its hashes are dropped (hw errors).
Oh... rest of the stack... I thought that means the remaining 9. Now the question is how often chips break. I guess overclocking will raise that probability.
All chips are connected in chain in|out-> in|out-> in|out-> in|out .... 1st chip forward message to next. Each miner have different number chip in chain.
In burnin solution are IIR two chain, each contain 10 chip.
How many chip stop working are depend what exactly are broken inside chip. Most worst scenario: 1st chip in both chain stop working definitely.
What can be done in such case? I mean Klondikes has here an advantage. If one chip breaks, regardless where, all other chips still work. But with bitburners one need a replacement chip and replace it, because otherwise more isnt working.
Can it be replaced easily? I might keep some chips at home then.
afaik the klondike is even more susceptible to this because all 16 chips are organized in one chain.
But you seem to be
overestimating chip failure rate
a lot.
Replacement:
if you have a SMD reworking station AND the skills - easy.
If not: impossible
Can you say something about how easy overclocking will be? Is it a switch or something? I believe Klondikes need soldering for doing that, i hope overclocking and overvolting is easier with bitburners.
And can you tell the name of the fan, or if its noname the airvolume, size and so on?
Then... what about breaking asic-chips? Will 10 chips stop working when one breaks? And does this one has to be replaced in order to let all chips run again?
Setting the Frequency is easily done through the cgminer Avalon frequency config parameter.
Voltage will be done through a config parameter as well.
Fan size: 92mm 55CFM, 32dBa, 3000rpm.
@burnin: Hey is it possible to say how high the boards gonna be (including the heatsink) ?
I plan a custom cooling on my Asics and need the data how high two stacks would be or what the size of one will be ?
I planned with a height of approximately 60mm based on the assumption that the fan is 80mm of cooling size + some mm for saftey.( comes from the assumption, that the long side of the board has 100mm and the fan needs to be a little smaller)
I would be very happy if you could provide any further information of the approximately height
!
Do you think there is still more OC for the WC cooled devices ?(Maybe reaching 500 with 1.5V ?)
What is the Maximum volts, which can be set?
One module is about 45mm high with heatsink, 92mm fan.
Much higher OC would be possible with the 10 Chip version because it can supply the whole 60 Amps to 10 chips.
At 450Mhz the 20 chip modules are already close to the power limit of the voltage regulators .
Probably already exceeding the 60 Amps design spec but with good cooling they should be able to push up to 80 Amps.
The upper voltage limit is 1.8 Volts
.
Edit: burnin please plan the PSU so that it accommodates with the overclocking figures and with stacking. thank you.
+1
Yes Please!
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Burnin,
You said in regards to air cooled over-clocking:
"Slightly different air cooling setup therefore different temperatures with air cooling. (fan placement)"
-Would this work with stacked boards or is the fan placement maybe unconventional just to get that umph?
You said:
"slightly increased error rate compared to what i normally call "stable" but close enough."
- What does that mean, maybe the numbers or the log/report from cgminer would clear this up?
-What is your personal opinion or gut feeling on
longterm air cooled over-clocking at
450 - 57, 52, 1.34V, 94W?
Normally stable would be lower then 0.01% errors, here we are talking 0.1%.
My gut feeling would be not to exceed 1.30V in the long term.
The PSU i am offering with the boards is the EVGA SuperNOVA G2 1000.But i'll see if i can find an equally good 1.5kw model.
). But... Woooooo-hoooooh again! 
). Also can you just resolder a bigger voltage regulator by hand and overclock even more this way? Can you deactivate One row of chips? This way you could go for pertty much insane clocks and voltages and if anything breaks you can go back to a safer value and use the other 10 chip row 
