Quote from: chunkylover53 on December 11, 2013, 01:59:36 PM

are you undervolting your cards at all ?

I had mine undervolted and one card was stable but the other wasn't. Had to find a value that worked for both.
I use two cards which have 2GPUs so I have 4GPUs but i only specify thread concurrency once ie --thread-concurrency 8192 not 8192,8192

Hello!

No not undervolting at all. I did a test though.
I disabled one of the cards in the device manager and just ran it by itself, it produced the expected khs. Then I disabled that card and enabled the other card and tested that one, same result. So both cards work. I think you are all right that this is related to the PSU.

I only have a 650W bronze cpu at home, do you think it is worth the try?

I also thought that maybe connecting more cables from the PSU as it is modular, so that each connection on the GPU gets a dedicated cable. Right now the connections are two cables from the PSU and then two connectors on the GPU's. But if I switch to four cables and one to each connector, perhaps that will make any difference. Thoughts?

Thank you all for your kind help!