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Author Topic: Help Request: CGminer / 5850 Litecoining Overclocking Quirk  (Read 764 times)
planman
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February 22, 2013, 08:47:31 AM
 #1

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




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planman
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February 22, 2013, 09:29:05 AM
 #2

Drum roll please!

Self-solving mystery case come to a conclusion:

If the software did not change, it must be the hardware.

I pulled the card out of the riser cable, re-seated it, and we are hashing along at 388 on both 5850's now...

Wow, that was 5 hours well spent!   Grin
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