I am also doing really badly on the hastrate, only getting 360 max for my ref. sapphire 290x!
however, I managed to compile vertminer 0.5.4pre via git for ubuntu 12.04 LTS x64.

i'd share it here!
https://www.dropbox.com/s/yuxk15h0as4nr83/vertminer-0.5.4pre.tar.gz

driver: 13.12, app-sdk 2.9, adl sdk: 6

tips appreciated!
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