Thanks for the help guys. So I went and read the Scrypt Readme and worked thru the CGMiner tweaking process, which went something like this:
Added setx GPU_MAX_ALLOC_PERCENT 100 to the first line of my bat file to allow it to use max GPU memory.
Set intensity at 13 then deleted shaders and thread concurrency to see what the bin file gives me for thread concurrency, which was 8192. I then increased thread concurrency from 8192 to 10240 and it crashed so the max thread concurrency it can take is 8192.
Then I moved to --gpu-memclock and increased it until the GPU crashed. Highest stable setting was 1650.
Then came the –gpu-engine which I pushed up to 1140 before it crashed, but interestingly from 1110 up to 1140 didn’t really make much difference in hashrate (596-607 at 1110 and 598-605 at 1140), so I stuck with 1110.
Then I adjusted the intensity. I tried 18, then 20 but the hashrate dropped from 13. So I tried 14 and it went down again from the 13 rate. I tried 12 and it fell right off, so I’ve set it at 13.
So this is my bat file after that exercise:
setx GPU_MAX_ALLOC_PERCENT 100
cgminer --scrypt -o http://coinotron.com:3334
-u XXX -p 1234 --intensity 13 --worksize 256 -g 1 --shaders 2048 --thread-concurrency 8192 --auto-fan --gpu-memclock 1650 --gpu-engine 1110
This gives a hashrate of about 598. Is this good for this card? I’m running it on an Asus Crosshair III Formula mobo, Phenom II X4 955 with 8GB of Mushkin DDR3 PC3 12800 7-7-7-20 Blackline RAM, with nothing overclocked except the video card via the CGMiner bat file.
I’ve only run it for 20 mins but the GPU temp is already at 82C so I may have to back something down a bit. What would you reduce if you wanted to reduce temps a bit but maintain a decent hashrate? Or is 82C fine for extended periods?
I haven’t tested the rate at which it finds accepted shares yet compared with GUIMiner – I’ll try and do that over the weekend.
Thanks again for all your help!
EDIT: I just noticed that the fan (using --auto-fan) was only on 85%. If I manually change the fan to run at 100% the temp drops down to 78C. Is it bad to max out the fan like that for extended periods, or should I just trust the auto-fan to do its thing and not worry about the 82C temps?