Thanks, i have a strange feeling... With your miner, i get 12Mh/s with all pool on groestl. I have 2 270x.
But with the grs-sgminer i get 7-8 with all other pool than cryptohunger and 30Mh/s with cryptohunger ... same configuration. There is something inside the code of the grs-sgminer make by cryptohunger that can give some strange hashrate ? ...
I don't know but now i'm switching on qubit, earning is the same i think.
I don't know if this helps:
http://myriad.theblockexplorer.com/help.php12Mh/s seems normal with my config, but the hashrate with grs-sgminer on cryptohunger is crazy (2.5x than expected) and the hashrate with grs-sgminer(almost 2x less than expected) on other pool is very very low... so i think there is something wrong inside the grs-sgminer and cryptohunger...