Hardware 4x 7950, 8GB of Ram, FX-6100 processor.
SoftwareCatalyst 12.8
ADL SDK 5.0
APP SDK 2.7
Xubuntu 12.04
CGMiner 2.11.4
What was happening before - Previously I was running this rig with 3 cards. I was getting ~1.5 Mh/s - 500 Kh/s per card. Not mind blowing, but acceptable. I was using the following command to start.
export DISPLAY=:0
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
./cgminer --scrypt -o stratum+tcp://stratum.give-me-ltc.com:3333 -u username -p password --thread-concurrency 24000 -I 18 -w 256 -g 1
What is happening now - So now I've upgraded my rig by adding an extra card. Instead of getting gains it seems my cards are simply running slower apart from GPU0.
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2Flr36Rge.png&t=665&c=o-9sPqqdQeuIjA)
It seems even at lower intensities now it's mining unevenly (@ I=13)
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2F4WviBjX.png&t=665&c=Zy_YCj6VhHcHOw)
Instead of getting 500 Kh/s I'm getting ~ 350 - 400 a card, even though with the same settings before I was getting 500 (same as GPU0). Can anyone suggest trouble shooting methods or ideas as to whats going on?
Help appreciated.