running 5 sapphire r9 290s with the following settings:

vertminer --scrypt-vert -o stratum+tcp://xxxxxxxxx -u x -p x -g 1 -w 256 -I 20 --thread-concurrency 32765 --gpu-fan 100 --api-listen
gpus fixed to 924mhz, temps around 71-82°. getting  ~2.1 mh/s.

played with the memory clocks but iam just able to get more hashes but lower WU, so i decided to keep it this way. the hw error problems does not seem to affect the 290s, so i stick to -I 20, getting 0 HW. WU is arround 95% of current hashrate.