Yup, 5870s run hot. It seems like with the stock cooler, not too much air gets pushed out those two little vents in the back so I guess it's not a big deal. I have the Ultra Durable Gigabyte with the funky cooler so I don't know for sure, but that's what I gather from the reviews. Anyway, like jay said, 90C is o.k for the card under heavy load.
hi...nice to know you... i have the same rig with yours. not quite same. but i used 790gx motherboard with 955 BE phenom II x4.
i use HIS 5870 reference cooler. the question i'd like to ask, did you have a "bottleneck" when u tested, or playing games. thanks.
cos i feel, in some of the games i played, the FPS sometimes dropped about 25-28 fps in a second. thanks for your help.