@wigsgiw 5830 is 8$ cheaper than 5850 - 280$ 
@JayC I just managed to get 190MHash/s but a core temp of 85C is way too high
@JayC I just managed to get 190MHash/s but a core temp of 85C is way too high
Something is wrong with your airflow then... I'm getting 212 Mh/s out of a 5770 in a dual card config, one is 58C and the other 67C.
Have you underclocked the memory down to 300mhz? What software are you using? SDK version?