I'm having the same problem! Have you found a solution? I also have G3220, Biostar H81S2, Ram 8 G PNY, Windows 8.1, AMD 13.25, 6 7950 GPU (2x MSI R7950 TFIII, 2x PC AX79503GBD5 2DH4, 1x Sapphire 11196-16, and 1x AMD R7950 Reference), Corsair AX1200 and CX750M.
Didn't used to do this before, but I had different problems (windows not seeing more than a few GPU). I've done more clean installs than I can count, it's very frustrating.
Topic: 4th GPU dying - Sapphire R9 280X Dual-x (Read 1067 times)
If I would have to guess you need more ram.
sounds like u need a 5th GPU to shift the problem away from GPU 4 
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!
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!
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