Anybody knows why TR miner on Polaris cards (470/480/570/580/590) builds DAG so long?
TR miner build it in about 12-13 sec. on my 580 8Gb cards. 1st of all I'm thought that it's only 1st time after launching (cache, etc.). But every time when DAG changes it take so long as at launch.
But other miners (Claymore, lol, Phoenix) builds DAG about 7-8 seconds.
Well, we just got tired of reports of aggressive (and in some aspects suboptimal) Polaris straps that caused the DAG build read/write pattern to crash gpus, so we defaulted to a very slow and safe version. For continuous ethash mining it's 4-5 secs extra every 4.5 days, 0.0016% penalty, but naturally worse if you switch between epochs more often for some reason, or crash every 2-3h and restart the miner.
I honestly don't remember exactly what type of cap we ended up with, but try adding --eth_dag_slowdown=0 and check the DAG build time.