I just recently bought a 1GB 4870 (http://www.newegg.com/Product/Product.aspx?Item=N82E168...) and quite frankly I'm not getting the same cooling/noise results as most of the reviewers claim. It idles at about 50-55C and goes up to 80C during gameplay and even a bit higher on the memory and this thing gets LOUD at anything above 50% fan speed which it is always at in game.
Sooooo... I was thinking about looking into a different aftermarket cooler. 80C is a bit too hot for my taste and frankly the fan is getting irritating.