Quote from: platinum4 on May 31, 2014, 11:14:18 PM

Quote from: Starscream on May 31, 2014, 09:52:23 PM

Quote from: restless on May 31, 2014, 08:39:39 PM

Quote from: svdinu on May 31, 2014, 05:29:27 PM

I have 2 cards, both running at 1050/1500MHz set with Afterburner (power limit +50). I had to take out the engine and memory settings from the config file as the memory frequency was jumping around between 150 and max setting. Very stressful on the system. Now everything is smooth. I kept only the temp control as I like the strategy.

My 290 also is jumping memory down to 150 and back, do you have any explanation what might be the reason for this behavior?!

Yes, powertune - when it's not configured properly mem-clock will throttle up and down (150-your mem speed).

I also had this issue and after looking for a solution for over a week I managed to fix it by enabling 'Unofficial overclocking mode without PowerPlay support'. I assume of-course that you are using MSI afterburner.
Uninstalling MSI AB might also fix it, or alternatively installing it if you haven't got it.

I made a topic about it a few days ago but no1 responded there; I had an image uploaded there, does it look similar to that? https://bitcointalk.org/index.php?topic=628425.msg6989373#msg6989373

Anyway, now I got a straight line representing my mem clock speed.

Confirmed, followed the steps for MSI AB and now have a bit more hash at my disposal, with constant memclock at 1500.

Thanks for the advice, we'll see if hash degrades in the next 24hrs.

After I fixed the throttling issue my cards ran for at least 48 hours without an issue and with steady hash. I have since bumped up the memclock to 1500 (few hours ago) and so far the hash dropped once and got back to normal after restart. So since the restart 2.5 hours ago they been running fine.
Anyway, with 1250 memclock it was running smoothly after the fix. Will probably go back to 1250 if the hash crashes again.