I have the fan running at 50% and cant hear it past my antec 900 case fans which are pretty quite. They run about 51 degrees idle and up to 63 full load. Check out riva tuner I just downloaded the new drivers which were released yesterday that supports HD4850 and HD4870 cards. Running both HD4850 at 700 and 1100 memory
I've read some posts that others have done the mod, it works very well, in fact if you have a well ventilated case you don't even need the 2 small fans that go with the accelero. Some people have also clipped one of the low CFM fluid dynamic bearing Scythe 120mm fans to the accelero for even better performance. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
sorry, no links to the other posts
Ok, sounds fair. If the stock doesn't cut it, then go for it.
I'd also add that a Zalman VF900 (or 1K) should do the trick also. I think they go by cheaper, right? Here on Chile we have a massive amount of DuOrbs and Zalmans, so i don't know any other brand/model from up close, lol.
Anyway, don't forget the ArticSilver5 dude! That's like 3ºc-5ºc less!