Quote from: Thirtybird on March 28, 2014, 10:59:55 PM

Quote from: phzi on March 28, 2014, 09:26:16 PM

Quote from: Thirtybird on March 28, 2014, 08:57:44 PM

To interpret this for cgminer, you'll need to change a few things - probably something like this...

cgminer --scrypt --worksize 128 -g 1 --lookup-gap 2 -I 12 --thread-concurrency 58624

A TC as high as 58624 won't work on any of my cards. Right now, I primarily use either 20479 or 28672 , although different values seem to be optimal for different algorithms/clockrates/BIOS versions. My experience suggests that lower thread concurrency actually yields better results a good portion of the time, and I find the lowest (shaders*n)+1 or -1 value that doesn't produces HW errors often yields the most completed work.

I will pull and build YACMiner on one of my rigs setup later and see what happens when I try your posted settings.

This is why you were having success then. To mine YACoin, YBCoin, ZcCoin OneCoin, or anything that's currently at N=14, you NEED as much memory allocated as you can. That thread-concurrency (58624) is the equivalent of the value I'm able to allocate on my cards. I could NOT allocate that amount when I only had 4GB on system memory - I was limited to somewhere around a TC of 28000. I could get the equivalent hash rate by allocating half of what I needed and running half the shaders, but when I added a third card, I couldn't even allocate half on the third card.

In my experience, I advise anyone who asks to put in 8 GB of system memory for mining scrypt-chacha coins that will be running cards with 4 GB of memory on the card. My other machine with 4 2GB cards works just fine with 4 GB system memory - it is at the limit though as I'm allocating 1753 MB per card - much more than that and I was having problems.

This is USEFUL information

I had suspected I might need to upgrade system RAM in my question regarding mining with alternate kernels. I will be upgrading to 8G ASAP, 2G only (which works just fine for scrypt) will hamper my success. Unfortuantely DDR2 which my old Intel DG965RY board uses is WAY more expensive. However moving to a newer DDR3 board would be much more of an investment I am not going to make Sad

I built my miner using old parts I had on hand ... (other than the GPU's and 1000W PS which I had to purchase.) Still have 2 pci-e slots available to add cards as panic dumpers sell their GPU's on e-bay

Third card may be pushing my luck regarding PS wattage. Fourth card will definitely need higher rated PS. As I have mentioned before volt-modding these cards that I have significantly lowered temps and cost to operate.

My old GPU's are 280x and 7950 both have 3G. Will these be sufficient as N increases over time and will I have to be re-tuning cards every time N goes up?