Time for an update. Here is the latest setup.
I have stacked a few more heatsinks on the chip, you can see the voltage adjust pot on the RHS, probes are montoring the Core Voltage. I ran overnight at 375MHz, 0.74V on the Core, Hashing at just over 20GH/s. Chip temperature held by the fan controller at a steady cool 35 Deg.
Here is the result of my overnight run on the Antrouter Pool.
Reported hash rate is a fairly solid 20GH/s
The miner stops hashing at irregular intervals anything from 5 Minutes to an Hour. The Cron Job then detects that the miner is not working and restarts cgminer. Here is a typical sequence from the System Log.
Mon Oct 26 07:12:01 2015 cron.info crond[839]: crond: USER root pid 30265 cmd /usr/bin/cgminer-monitor
Mon Oct 26 07:12:01 2015 user.notice root: [Last Valid Work] => 1445843521
Mon Oct 26 07:14:01 2015 cron.info crond[839]: crond: USER root pid 30289 cmd /usr/bin/cgminer-monitor
Mon Oct 26 07:14:01 2015 user.notice root: [Last Valid Work] => 1445843641
Mon Oct 26 07:16:01 2015 cron.info crond[839]: crond: USER root pid 30315 cmd /usr/bin/cgminer-monitor
Mon Oct 26 07:16:01 2015 user.notice root: [Last Valid Work] => 1445843750
Mon Oct 26 07:18:01 2015 cron.info crond[839]: crond: USER root pid 30341 cmd /usr/bin/cgminer-monitor
Mon Oct 26 07:18:01 2015 user.notice root: [Last Valid Work] => 1445843750
Mon Oct 26 07:18:01 2015 user.notice root: Case B
You can see the repeated LVW that the script has picked up and these are valid stops as I have sat and watched some stops.
So bottom line is that the Cron script is doing a good job of keeping the Miner going, the question is why does the miner stop in the first place?
I will wind the frequency right down to standard Today and see if it is frequency related?
Rich