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Are you trying to use this as a pc also? i would recommend increasing tc somewhere 12-20k and running -g 1 and difficulty at 19 or 20. also what psu are you using? limited by power maybe?
im sorry im not very familiar with 280s i run 270s. the tc and intensity seemed low to me. Are you having any issues with rig freezing or any other power related issues? also what brand psu are you running as i think a good name brand 1000w should be enough.
My 280xs get around 710 each using the following:cgminer --scrypt -o stratum+tcp://pool1.us.multipool.us:3352 -u xxxx -p x --lookup-gap 2 --thread-concurrency 8192 -g 2 -I 13 -w 256 --auto-fan --gpu-fan 80 --temp-cutoff 90 --temp-overheat 85 --gpu-memclock 1500 --gpu-engine 1050 --gpu-powertune -20 --expiry 1 --scan-time 1 --queue 0 --no-submit-staleAnd you can change the fan speeds of the cards if you want as well as the temps. I have the same cards in my system so I leave it at that but if you want to manually change the speed of each fan for example if you have 3 you would put "--gpu fan 80, 75, 70" that would have the first card run at 80%, second at 75% and third at 70% because some brand of cards run a little hotter so might need higher fan speeds.hope that helps at all.which cards are you running?
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