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I've just started mining and have been OC'ing most of my cards using winter air cooling in MI. I can't seem to get the cgminer running for more than 6 hours at a time. I have reset everything to default values and got up to 1 day 5 hrs before one of my Powercolor 7950's went sick....

How long have you guys been able to keep cgminer on for before crashing? Is it common to have to restart the miner every day or hours?

I have 5 7950s on a MSI Z77A GD65.

I just reset it today after running over a month.

I reset ti only because I was tinkering with something unrelated.

It is possible to get high hash rates by OC'ing the eyeballs off your 7950, but the higher you push them the shorter the period they will stay up.  One thing I noticed about all of my 7950's is that don't perform well with low intensity settings "-I 13" for example... like a 7970 will.  So you have to go for the higher "I" settings... personally I can run a 7950 for weeks if I keep the hash rate below 600kh/s.  I try to keep mine at 575kh/s average.  Since my rigs are 20 miles from my house...its more important for me to keep them running around the clock... so I'm willing to sacrifice a bit sprinting...and treat it more like a marathon...

I've had an older version (3.1.1) run for over 60 days and I ended it because of rerouting some cables, not because it crashed.

One of my rigs has been running at 2000khs without any crash for over 6 months!

How many cards do you have in the rig?  Is it OC'd?

I've never had electric service so reliable, my power flickers on and off too much...

This is one of my longest runtimes I actually was aware about, so I took a screenshot  ;D

http://i879.photobucket.com/albums/ab357/pontiacg5_2010/IMG_20131224_155039_zpsd90cd1b8.jpg

Just a theory.

Your temperatures are ok and HW errors low, so I doubt its a problem with heat or overclocking.  Which PSU are you running?  You need about 300W per GPU.

cgminer is a great program.  Just don't use ADL functionality on Windows.  Lower your clocks if cards go sick.
Use MSI AB to set clocks and fans.  Find a sweet spot E/M ratio.  Set clocks for individual cards as they all are different, even if they all are the same model and are from the same manufacturer/batch.  Different ASIC quality, different clocks.

I've had systems that run for months without a restart.  Usually restarted by power outages or my watchdog.  But most rigs run for weeks without a restart.

Are you running this on Linux?  If so, you might want to make sure your drivers are up to date and compatible.  We ran into a similar issue and found that it had to do with Linux drivers being funky.  After we fixed that we haven't had to restart cgminer for a month or longer.

I run mine for 2 weeks, then I usually restart, update windows, update virus protection.....

I would disable windows update , firewall and virus "protection" if I were you.  They will cause more problems than they will solve.
Why you need a virus protection on a mining rig?   

Once you have a stable system, clone the drive, create a system restore point and do not touch it, and don't let any software update it in any way.

I have a thermaltake 750W gold rated and a Rosewill 850W bronze rated. I think that should be more than enough power?
 

They are all different brand cars (I was stupid, I know, but it was hard to find the same model 7950). So I have to individually OC them in cgminer configs..I will try running the two cards that are giving me problems by themselves soon to see if they are no good for mining.

Currently I have:

His IceQ
Gigabyte WF3
XFX Double D

Running a total of 1.8MH/s for more than a couple days so they are stable at intensity 18-19 with 1.25% rejected and no HW errors. Temps below 70 with 70% fan usage.

I really feel like the best way to go is with BAMT.  I do have a Windows rig also though.  My Windows (8) rig will run for months without needing restarted.  What I have found with Windows is you have to use the right driver.  I am using 13.1.  I tried all different kinds of drivers and once I found 13.1 and got my cards running good I will never change it.

I get 620 KH/s per card (7950's).  Runs stable non stop for months if I dont mess with it.


I only have experience with my 7950's but I think each brand card has its own sweet spot between drivers, and config (TC, Intensity, etc).

3X 7960 running 665khs since birth!

What is a 7960?

What kind of 7950's and what are your core/mem for them?

almost once every month, sometimes cgminer just randomly freezes for no reason..

I dont think I have ever saw cgminer freeze.  The only times I have had to restart it was when a card showed up dead or sick.

What version of cgminer are you using?  I still think it comes down to finding a good mix between Intensity, TC, clocks, and driver.


It toook me almost two weeks of testing to get my rigs running right.  But now I dont have to touch them for months.

after weeks of effort, hours and hours spent, with two GPUS:
~30 hours

I've run it for 2 months no issues.