Working since a week without problems | reject-rate @ 0.91% (VERY LOW!) | 0 (zero) Hardware errors!
1. Buy this fan and put it on your R9 290: Arctic Accelero Xtreme III
2. Download ASUS GPU Tweak and use these settings:
3. Worker.bat
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
start "~~~~~~~~~~~ BTC @ Middlecoin & LTC Backup-Pool ~~~~~~~~~~~" cgminer.exe --scrypt -o stratum+tcp://eu.middlecoin.com:3333 -u 151CYmhGJTw43St6fhn4X7Siyxih6adRR2 -p x -o stratum+tcp://middlecoin.com:3333 -u 151CYmhGJTw43St6fhn4X7Siyxih6adRR2 -p x -o stratum+tcp://eu-1.liteguardian.com:3335 -u punkrock.mining -p x -I 17 --queue 0 --lookup-gap 2 --scan-time 1
If you don't work on your mining machine, you can set the intensity higher, but in this case you might have to set the fan speed higher too, to get these nice temps.
Oh, and by the way: You won't hear the fan... it's so quiet, yeah!
Enjoy mining and send some coins to support posts like this one!