Problem running 2 cards at same time.

[Bitcoin Swami]

I'm using linuxcoin since I'm a newbie into this mining realm.  Anyways I'm running the polcbm (however you spell it) miner.  I have 2 6950's I get about 330 mhs out of them when they run alone, but when I start up my 2nd one (the one the monitor isn't hooked up to).  It will jump around alot going from 330 to 300 to 150 to 250.   But when I stop my first card, it'll just jump up and do steady 330 mh/s. 
Any Ideas? I am new to linux but I've learned alot in one day.
Go easy on me.

Thanks

[1715358212]

1715358212

[TurdHurdur]

Did you specify differing devices?

[Bitcoin Swami]

Did you specify differing devices?

Um i think so.  My first card is device 0 and my 2nd is device 1. 

[Bitcoin Swami]

apparently the -f flag was the culprit.  now both cards doing about 330 mhs.  Time for me to go to bed. 

Thanks for responding.