using this one my efficiency decreased... only 39% something, dont know whats wrong, but using the ordinary cc miner gets 98%
That one is older revision of the miner, its from 2014 if I recall it right. Someone called bobiro developed and released it secretly in a private github repo that has been lately hacked and the download link for that miner has been posted in the open. Whoever u are if u read this, better avoid and skip to the next thread.