@citronik: hey, not bad. I am surprised. Still haven't cracked 600. Getting close tho. I get the feeling it's about architecture, quality of components, and memory timing. Not sure I'm gonna make much more headway until I optimize the timing. Clock speed seems like kind of a blunt instrument.
Currently I am mining ZEC because its most profitable to mine now.
However when XMR was hot a few weeks ago, I use sgminer-gm-v5.5.5-8-Nicehash on Linux (ri 1008 w

, selling hash at Nicehash Cryptonight marketplace.
In most cases, my RX480 rigs perform well on ETH mining.
While my R9 Nano Fury rigs performs best for ZEC and XMR.