Quote from: ISAWHIM on May 28, 2013, 12:54:51 PM

Your driver/cgminer is bugged... Just try reloading the "saved" card profile, and restart the miner program.

what do you mean "saved" card profile?

Quote from: ISAWHIM on May 28, 2013, 12:54:51 PM

Using any single 16x slot may make it 16x... but using both, may degrade them to 8x each... or only one is 16x, the other turns into 8x... etc... (Less bus-speed/volume)

Could also be that a pin has "dust" on it, thus, no contact... or the card is not completely seated right... (pin touching two contacts, or not touching "enough".)

the 5870 slot runs at 4x (which someone i know from IRC says should even run a 5970 just fine). i'll have to play with thread and other settings, i guess.

would i be getting 94+% accepted shares if it was a bad pin connection?

Quote from: GenTarkin on May 28, 2013, 02:54:06 PM

cgminer 3.1.1 seems to have this issue for me on random gpu's too, it happens over time after hours of mining, randomly start to get HW errors - invalid nonce.
I went back to older cgminer version and problem went away...

what's a good version? (or at least for you)

also, thanks for the suggestions!