Hey, i am using R9 280X Vapor-x’s too, and i am getting a 740Kh/s peaking up sometimes to 900Kh/s which i think it’s insane for this GPU…
Here is my batch line right now:
cgminer.exe --scrypt -o stratum+tcp://p2pool.org:9377 -u USERNAME -p PASSWORD -I 13 -w 256 -g 2 --thread-concurrency 8192 --gpu-engine 1050 --gpu-memclock 1500 --gpu-powertune -20 --gpu-fan 65-100