CGMinder chokes after miner restart.

[Hardwyre]

Hello Forum.

Have a rather irritating and potentially disruptive problem.

On a fresh reboot, I can load CGMiner and run it just fine.  My system is perfectly usable for doing other things like browsing, and all the while I'm averaging about 270 khash/s on scrypt coins with my 7850.

However, lately I have noticed that if I restart CGMiner, it acts as if my intensity is really high and my hash rate dumps to about 20 khash/s.  I have to reboot the computer to clear things up.

The concern is that using CGWatcher to restart the miner in the event of a hiccup will cause this choking, so automation is out of the question.


I performed a reboot, loaded CGMiner, got 280khash, and (Q)uit the minder, then restarted without having changed anything, and suddenly it is running completely like crap.

I have a Butterfly Labs SC running under BFGMiner for SHA coins, but I don't know how that would be a problem.

The current script is: cgminer.exe -o stratum+tcp://pool1.us.multipool.us:7777 -u <redact> -p <redact> --scrypt -I 13 -w 256 --shaders 1024 --thread-concurrency 8192

(Note, someone suggested these settings as well " -g 1 -w 256 -v 1 -I 18 --thread-concurrency 8064 --lookup-gap 2" though the intensity would expectedly make it jerky)

Video card: XFX FX-785A-ZD 7850 1GB
Driver: 13.101.0.0 - 6/4/2013  EDIT: now its Driver: 13.152.1.8000 - 10/8/2013
CGMiner: 3.7.2
OS: Windows 7 on 16GB RAM.

Any thoughts?  Thank you for your time.

[bassminer]

I had some issues with my 7850 after closing down the mining program during Bitcoin mining days. It had something to do with the 2D and 3D clock speeds. After mining it would switch to the 2D speed causing a voltage drop and I kept getting driver crashes. The solution was to setup a Catalyst profile so 2D Core 585MHz, Memory 680MHz, 3D Core 956MHz Memory 1210MHz. This kept the Voltage at 1.075V so It didn't cause the crash. Something to try, have a look at the GPU-Z graphs to see whats happening with the Clocks/Voltages.

Switching just recently to Litecoin mining to generate some heat I have a similar problem the driver would keep crashing. Currently using just -I 13 and removed all the other settings. Pushed it up to I 14 and its running ok for 3 hours so far at ~275Kh/s. If i put I at 20 it will go to ~360Kh/s but its too unstable.