Win 7 64 Rig with 3 x Gigabyte r9 290 (totally failed to get Linux to work, just haven't got the skills 
)
http://farm3.staticflickr.com/2856/12172813925_1003f5987e_o.jpg
Settings for cgminer (so far stable), temps are very stable, have a blower fan just moving the hot air away from the rig, without it they peak at 83c, with the window open (it's a cold day) they peak at 75c
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -o -u -p -I 19 -g 1 -w 256 --lookup-gap 2 --thread-concurrency 24550 --gpu-engine 1000 --gpu-memclock 1500 --gpu-powertune 10 -v 1 --auto-fan --temp-cutoff 85 --temp-overheat 83 --temp-target 78
Adding another rig tomorrow with the same spec.
Happy mining!
)http://farm3.staticflickr.com/2856/12172813925_1003f5987e_o.jpg
Settings for cgminer (so far stable), temps are very stable, have a blower fan just moving the hot air away from the rig, without it they peak at 83c, with the window open (it's a cold day) they peak at 75c
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -o -u -p -I 19 -g 1 -w 256 --lookup-gap 2 --thread-concurrency 24550 --gpu-engine 1000 --gpu-memclock 1500 --gpu-powertune 10 -v 1 --auto-fan --temp-cutoff 85 --temp-overheat 83 --temp-target 78
Adding another rig tomorrow with the same spec.
Happy mining!