97 degrees centigrade is hot for a graphics card... too hot. You'll burn your card out in a week going like that. Use some third party software like MSI afterburner to set your fan speed to max.
(Take a look at your hardware errors "HW:" they're through the roof..)
266/3298 = ~8% of the reported rate is actually being accepted.
Also I'd recommend lowering your Intensity value to 12, and creating another thread. (ie: -I 12 -g 2)
It'd help to know what card you have.
Hd 4890.
and what about this?
--thread-concurrency 1500
what value should be the best?
PS: i tried cutting this off -> -I 15 -g 1 -w 128 --thread-concurrency 1500 (i will lower the intensity and -g 2 .but i want to know the other two commands like w and thread concurrency)
now its getting ~14kh/s and zero HW.