Hi All,

     I've had a dedicated mining rig with 1x Sapphire 7950 (the version with the single loud fan) mining along at close to 500 hash for three weeks now.  I just recently scored a deal on a Gigabyte HD7950 card, and installed it in this same mining rig.  For some reason, no matter which options I try I am getting a total of max 570 hash.  As of this moment BFG miner is reporting 311 hash from the Sapphire and 265 hash from the Gigabyte.  Anybody know of things I could try / do to get better performance from these two cards?  Below are the current arguments I am using with BFGminer. 

bfgminer -o http://deepbit.net:8332 -u -p -I 7,7 --gpu-powertune 20,20 --gpu-engine 1075,1075 --gpu-memclock 1650,1650 --auto-fan --temp-target 80,80 --temp-overheat 87,87 --temp-cutoff 91,91 -g 1 -w 256,256

I tried lowering the worksize to 64, increasing the threads to 3 and adding a vector of 1 argument, but that did not make a difference.  It looked like it was starting to mine at a high has rate, but evened out as time progressed. 

I did try some searching around the forums before I made my own post, but I am still at a loss. 

What ever ideas or assistance would be grateful. 

Thanks,

Rock