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Title: 7870 Litecoin/Scrypt - Can't get above ~280 Post by: nightengale on May 09, 2013, 12:03:03 PM Trying to help someone get a little more out of his 7870. I'm running...
cgminer.exe --scrypt -o <site> -u x -p x -v 1 --worksize --lookup-gap 2 --thread-concurrency 8192 -g 1 --intensity 13 GPU clock 1103 MEM clock 1450 This is a Win 7 x64 system with 16 GB RAM and the 7870 is the only card in the box. Using Catalyst 13.1. If I go above an intensity of 13, I start to get hardware errors. If I set thread concurrency above 8192, cgminer won't start. I'd like to figure this out, because it could have easily been me who bought the 7870... ;) Title: Re: 7870 Litecoin/Scrypt - Can't get above ~280 Post by: Spetznaaz on May 10, 2013, 04:49:26 PM Try using -g 2 with -I 13.
Also, try decreasing GPU clock speed by about 25Mhz in both directions - see which one results in increased hashrate and which result in decreased hashrate - then continue in that direction by 1-2Mhz at a time, eventually the hashrate will suddenly drop, back up a couple Mhz and that should be the sweet spot. ALso try: -s 2 --expiry 1 --queue 0 --thread-concurrency 8192 -I 13 -w 256 -g 2 Let me know what happens. |