Lower your intensity and your TC (thread concurrency).
For the hardware error, it's usually the TC
You can also play with :
--gpu-powertune 20 --gpu-threads 2[code]
I have a 280x so not sure, but something like :
[code]--gpu-threads 2 --gpu-powertune 20 --thread-concurrency 8192 --temp-target 80 --scan-time 1 --queue 0 --intensity 13 --lookup-gap 2
Give me the best result.
Putting more in TC give me too much hardware errors.
(but yes, it's a 280x, so maybe it's not the same).[/code][/code]