Strange hashrate

edited December 2013 in Hardware support

I've build a second mining rig with 2 XFX HD7950 cards in it. Only my hashrates are very wierd. When i start the miner everything seems okay, but after like 15 minutes CPU 1 gets a steady hashrate while the hashrate of CPU2 only gets down more by the minute.


image
After 15 minutes

I tried various drivers: Catalyst 13.4, Catalyst 13.9, Catalyst 13.11 Beta

My OS is Windows 7 and is use CGMiner 2.7.2. I've used the following settings in a .bat file:

timeout /t 30
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -o ltc-eu.give-me-coins.com -O x.x -I 19 --temp-target 76 --gpu-fan 30-95,30-95 --temp-cutoff 90,90 --temp-overheat 85.85 --auto-fan

I realy hope some of you guys can help me out:)

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