Heya!
Just expanded and added an exact same setup. Everytime I start cgminer after 2-3mins the 4th GPU dies - I get the message "driver has stopped responding and has recovered" and the 4th GPU becomes a CPU miner. If I disconnect 4th GPU the same thing happens to the 3rd one - which is fine when 4th is connected....
Windows 8.1
Corsair AX 1200i Digital 1200W 80+
Sapphire Radeon R9 280X 3GB DUAL-X OC x 4
Corsair 4GB (1x4GB) CL9 1600Mhz VENGEANCE
Intel Pentium G3220 3.0 GHz (Haswell)
ASUS Z87-PRO ATX
120GB Sandisk SSD
14.1 Driver - Tested with 13.25 aswell no improvements.
CCC disabled
Reformated comp. no fix
Pulling 900-1000W from wall
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -o stratum+tcp://amsterdam.middlecoin.com:3333 -u 1Ff5EdwbfSon8GZkVUyKLkte5mMuixi2tx -p x --failover-only -o stratum+tcp://middlecoin.com:3333 -u 1Ff5EdwbfSon8GZkVUyKLkte5mMuixi2tx -p x --lookup-gap 2 --thread-concurrency 8193 -g 2 -I 13 -w 256 --auto-fan --gpu-fan 30-75 --temp-cutoff 90 --temp-overheat 85 --temp-target 72 --gpu-memclock 1500 --gpu-engine 1020 --gpu-powertune 15 --expiry 1 --scan-time 1 --queue 0
Help me out please!