cgminer freezes, middlecoin-specific?

[HumbleMiner]

Hi,

My cgminer freezes unexpectedly on both of my mining rigs (first is Win7 64-bit with 7700 and 290, second is BAMT with 3x7850). Both rigs point to middlecoin.com. There are no HW errors, moderate amount of rejects (3-5%). Cgminer 3.7.2, here is the command line on the Win7 box :

cgminer --scrypt -o stratum+tcp://middlecoin.com:3333 -u xxxx -p xxxx --intensity 19,16 --worksize 256 --thread-concurrency 24000,8000

I wonder if the issue is related to the fact that the middlecoin switches between different coins every few minutes and that at some point cgminer goes nuts due to frequent switches? Am I pushing GPUs too far? I OC'ed all of them pretty much to the max, squeezing 479Kh/s from 290 and 383 kH/s from 7850. I tried using cgminer 3.5.0 on the Win7 box but it also froze after several hours.

Any help would be really appreciated.

[kylekartan]

I haven't had any issues like that with my miners on Middlecoin. Also, IIRC they don't switch coins that often.

Since you've overclocked everything, the first thing I would do is set it all back to defaults and see how cgminer behaves. If it's stable, then try slowly increasing the settings.

Good luck

[HumbleMiner]

I haven't had any issues like that with my miners on Middlecoin. Also, IIRC they don't switch coins that often.

Since you've overclocked everything, the first thing I would do is set it all back to defaults and see how cgminer behaves. If it's stable, then try slowly increasing the settings.

Good luck

Yeah, I've been thinking about that. What bothers me is that the last night's freeze happened at the same time (as far as I can tell) on both boxes. Could be a coincidence, need more data in order to be certain. I'll try lowering the GPU clock at least on my Win7 rig before I go to sleep, and leave the BAMT box running as a control. Thanks for your answer!