Well you should be able to get at least 700Kh/s with that card.
What voltage are you running? That temp seems a bit high for only 600 Kh/s
Don't you mean
Mh/s? I'm running it stock. I'm afraid of tweaking it, for fear of making it unstable. I would love to get 700Mh/s, though.
Well i've been referring to scrypt mining i.e LTC - So if you got 700Mh/s SHA-256, you should get 700Kh/s scrypt, if you get what i mean.
Sorry i read what you said as Kh/s.
As for mining SHA.. hmm well i found SHA got hotter than scrypt, but you should be able to get 700Mh/s with that card and still have lower temps.
I can't remember how i optimized back when i was mining BTC, but i can try and help you.
What are you current settings for GPU/Memory clocks and voltages (the stocks if that's what your using) and cgminer settings for each card?
I reckon the voltage is probably way too high at stock just like with the Sapphire.