Because running out of windows licenses, i deceided to run my first linux rig (completely new to linux).
For testing i'm running a Radeon 5870 which makes stable 400kh/s under win 7 x64 Catalyst 13.12 (no hw errors, and very low rejected) using following config:

"intensity" : "18",
"shaders" : "1600",
"thread-concurrency" : "9600",
"vectors" : "1",
"worksize" : "256"
"gpu-engine" : "850",
"gpu-memclock" : "1200",
"gpu-vddc" : "0.000",
"lookup-gap" : "0",


Trying Bams 1.3, 1.4, 1.5 and unsing different guides/settings from the web, cgminer always stuck at ~300 kh/s without hw-errors.
After changes in the cgminer.conf i always start cgminer with cgminer.sh :

export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
export DISPLAY=:0
find *.bin -delete
sleep 5
./cgminer

Also tried catalyst 13.12 but no improvement...
Is that a driver issue (what i guess) or a settings issue?

I'm running 4x AMD 270x well under Win 7 x64 (6GB RAM, 1500W PSU)
Now i'm trying to install 290X without any success (always error 43 in Win).
Tried to install Linux whole day, but i'm too dumb for that  
Is there anybody who has 5 or more R9 270X (280X/290X) on 1 Mainboard with Win 7?

after lurking now i'm active!