i agree with these guys, it does make it louder than usual and you only really need one if you have your ps3 in an enclosed space or live in a very hot place.
I have the one that you attach to the side/top (depending if you have it horizontal/vertical) and it does get loud, but it doesn't bother me because I usually have something louder on that's drowning out the fan noise.
I had a heat issue as well. My front is open but the back was closed. I cut 2 (80mm) holes in the back of my stand. Went to radio shack and picked up a power suply and 2 case fans. While gaming I run the fans at 12v while watching Blu-rays I run them at 7.5v.
P.S. you can find these materials on-line for cheaper, but when I want to do something I want to do it now so I'll spend the extra $20 and by reatil.
I also have my PS3 in an entertainment center, which has an oval opening at the back to allow cables to enter/exit. What I did was zip-tie 4 PC fans sidebyside and then splice the wires together to a single USB connector. This is plugged into one of the USB ports on the PS3 so they all spin up when the PS3 powers on. This sucks the hot air out of the cabinet and allows the PS3 to run cooler.
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