Hello Everyone,
The hash rate on one of 5850s has suddenly dropped after running drama free for an extended time.
I run 1 x 5830, 2 x5850's, and one 6870 in a single rig. I Run CGMINER 2.10.5, Windows 7, and the latest drivers from AMD. I mine litecloins.
The Khash rate has been unchanged for 30 days since I setup the rig. I take notes and pictures to document my numbers.
For the last month my hash rates were
5830 -- 299-301 Khash 73C
5850 -- 381-384 Khash 72C
5850 -- 381-384 Khash 72C
6870 -- 297-299 Khash 73C
Windows and all other auto-updates are turned off so far as I know.
Suddenly this morning the hash rate dropped. Here's is what I found:
5830 -- 299-301 Khash 73C
5850 -- 299-301 Khash 72C <====Changed from 381-384
5850 -- 381-384 Khash 72C
6870 -- 297-299 Khash 73C
I literally had not touched the machine...
First I hit Q and shutdown, power off, reboot, and relaunch. Still stuck at 300Khash
Second I check my command line (below) and my command line is unchanged:
cgminer --scrypt -o
http://ltc.pool.ext:port -u user -password x --auto-fan -I 19 -g 1 -w 256,256,256,256 --lookup-gap 2,2,2,2 --temp-target 75,75,75,75 --temp-overheat 85,85,85,85 --thread-concurrency 8192,8000,8000,8000 --gpu-engine 950,915,915,915 --gpu-memclock 900,1100,1100,1200 --failover-only
(I have run this command line unchanged for weeks, open to tuning suggestions but mainly trying to understand the drop in hash rate first)
Third I restarted CGminer, the used <G> <C> 2 to check the GPU speed of GPU 1 (the slow 5850). The GPU speed is 725! I set the GPU speed to 915 but no increase in hash AND when I recheck the card in cgminer we are still at GPU speed of 725 and memory of 1000.
I exited CGminer and ran Sapphire Tweak. Tweak show the GPU at 915! So I restart CGMINER and recheck the card. GPU is back down to 725/1000. Exit, check Sappire abd Sapphire Tweak says 915/1100!
Restart CGminer and back to 725/1000
I delete all the ,bin files in the cgminer software folder and restart using the above command line.... and the 585- is back to 725/1000.
Poweroffs, reboots, even minor tweaking of the command libe have failed.
Does anyone have any suggestions? What did I miss?
Thank you,
Charles
