TRAGEDY
2 days in a row my miner waits for me to sleep and stops one die.
(I am inventing fiction to explain my die knowing I am awake)
Speed at pool still better than stock with one die off.
Different die each time.
First time I had to POWER CYCLE 2 times to get it going again!
It was an intense few minutes.
If you have ever had a PC not boot due to dead disk you know the feeling.
Second time I just restarted with lower clock on affected die and all OK.
(no reboot necessary)
I lower die speed one 'notch' and continue.
I use 99 test.
I leave Advanced Tuning at DEFAULT voltages.
I change SPI clock to 256k (default is probably fine)
(no ryme or reason for this one but it looks good on the scope)
SPI clock too fast and HW increase.
I have every die running different speed.
Sometimes I can change the clock on a single die on the fly.
Sometimes when I try to change on the fly it stops everything.
I have a notion that the ALL KnCMiner ASIC's do not like much more than 40 W per die.
Posted VRM info from Nov miners shows all close to 20W also in line with notion.
I can run a die faster/hotter, but not all die on ASIC fast/hot.
I keep AVERAGE power on ASIC close to 40 W per die and it works well.
I do not run 2 in a row fast, I skip one to keep total power lower.
The clock and the power are directly related.
1D1 750 38W (stock)
3B2 750??? (might not work but there is a pattern to follow)
3C2 762 38W
3D2 775 38W
3E2
untested (787???)
3F2
untested (800???)
1F1 800 39W
211 850??? (does not work but is next in 'pattern')
825 39.5 W
850 41W
875 43W
950 49W (not stable long term)
If you have a sleeping die you might try
1C1 700?? (just a guess)
392 725??? (just a guess)
3A2 737??? (just a guess)
Something is better than nothing!
I'm guessing the VCO runs between 1-2GHz based on observations with bfgminer and miner.php
WARNING some clock combinations will never work and may not be good to try.
WARNING some clock combinations draw LOTS of POWER
DO NOT go hunting with 8 VRM's unless willing to sacrifice a die or ASIC to the cause!
You have been warned!
If you are not using bfgminer you are flailing in the dark.
You will never know the status/speed of individual die.
If you want to use custom miner.php page (needs bfgminer)
My modified myminer.php looks like this ->
http://codepad.org/YLQBbJEm"Dangerous toys are fun but you might get hurt" Vash the Stampede
Enjoy
EDIT if your HW error is above 1-2% you can probably do better.
When a die is happy HW error are low.
If HW error is high a lower clock(lower HW) will be faster at the pool!
You need bfgminer to know details.