7950 MSI working on 690 Mhs 
That is a good hashrate for a 7950, is it a twin frozr card?
Although I think you would do a lot better on LTC, especially if you can maintain 690kh/s
No it is not twin frozr card that is the point
I am mining LTC and it goes 690 +
They are outside and i dont have a temperature problem