XFX HD 5870 Review
 

The only con other than the oddities with overclocking/driver support would be how loud the fan gets when manually set above a third of its capabilities. Generally when I overclock I set the fan speed to 100%, but it sounded like a jumbo jet engine was being tested inside my case. When left at auto or kept in the low 30% range the fan was inaudible next to the case fans so it isn't really a problem, more of just a notice to others that this thing can be loud when set to higher speeds. At higher speeds this fan pushed a lot of air!

http://www.overclockersclub.com/revi...1gb_hd587a_zn/