For those who aren't sure of the required replacement or whatever.
If the stock fan's getting on your nerves, fear not - it can be replaced. It doesn't look like it but it can.
Oh, and apologies for all the confusing different fans I used in these photos. Sucks that hotlinking doesn't work though.
Here is the cooler (fan replaced in this image)
First of all, unclip the small black clips on one side, the other side will not need to be unclipped.
Lift the plastic free, and you should have this.
Unclip the small black clips in the image, there will be one at each corner. the fan is held onto a small black pole by these clips.
The fan can now lift off, and you can replace it with the fan of your choice (see below). Click the clips into place, then slide the fan back onto the main heatsink.
Enjoy the result
Be careful with the small clips holding the fan on, they are fragile - don't switch fans too much as they will probably snap.
The cooler accepts any fan with 80mm mounts by the looks of it, I have fitted three different 80mm fans successfully. The fan it comes with is 92mm with 80mm mounts, so you could get a fan like that I think.
The Silverstone FN83 is 30CFM/92mm, 80mm mounts/19.8db. This might be worth a try.
Akasa ambers are no good, 20dba/21CFM, little advantage over the stock fan.
Xilence RedWing 80mm are 15dba/19.8CFM and are very cheap at ~£5. Good for silencing.