In fact ,i give up .The difficult is too high now.

Yes, me too.
The climbing of diff is far fast than the price increase.
Mining other new coins may be more profitable.
Mining HVC with radeon cards is over. geforce is much more powerful
but gforce aren't that great in scrypt(mining new coin even if there are asic scrypt is still profitable), yes they consume less but more rigs are required, also they can't mine x11 algo yet
dunno what to do honestly, waiting top maxwell and going with readon for now or sell the readon to purchase the 750ti...