Did you try swapping the card slots? Which card are you using for your monitor?
-tb-
No i did not tried swapping the slots yet, i am using Asus r9 280x for my monitor.
I am using
850watt PSU
16gb ram
core i-7 2600k
windows 7 ultimate 64 bit
when i run them individually, one at a time mining speeds are good
Radeon HD6950 gives me 460~470Kh/s with 70~75c temperature
Asus r9 280x gives me ~750Kh/s with 70~75c temperature
but when i run them simultaneously from 1 bat or even with 2 bat files from 2 cgminer different folders Asus r9 280x speed drops to ~574Kh/s
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Update:Made some changes in bat file and managed to rise the Asus r9 280x speed to ~625Kh/s, summary speed from both cards 1.090Mh/s with this config
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe --scrypt -u XXXXX -p XXXXX -o stratum+tcp://global.wemineltc.com:3335 -I 18,13 -g 1 -w 256 -v 1 --thread-concurrency 7104,11200 --auto-fan --auto-gpu --gpu-engine 935,1185 --gpu-memclock 1300,1875 --gpu-fan 30-85 --temp-cutoff 90,90 --temp-overheat 85,85
But now Asus r9 280x is crashing after 15~20 minutes.
Any help?