On rigs with 6-10 GPU, what % of the time are you actually able to mine?

Thanks

I trade on Poloniex, but I find their charts to be lacking. There are limited indicators and not many time frames to choose from(not even 3m or 1yr wtf?).  Any suggestions for betting charting software?

Thanks!

Is there a reason why the price on BTC-E is so much lower than the other exchanges?  It's currently trading at $1018 while Bitstamp is $1054.  The Chinese exchanges are even higher.  Couldn't someone just buy on BTC-E and sell on Bitstamp?  I'm assuming I'm missing something so if someone could explain this to me it would be much appreciated!