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fat or slim? I am going to assume slim since they are usually the "quite ones".
Im not exactly sure what the specs are on a ps3 fan but you should be able to take a dmm and find a 12v source. Once you find a 12v source just solder your fan + to it and the other to ground. I know the ps3 fat has a monster fan inside so it would probably sound like a jet taking off.
I have my friends ps3 sitting here that needs to be reflowed and ill do the 12v fan mod on it and let you guys know if it works and how loud it is.
I think i found a solution. It came from another forum. I do not take credit for or put my word on it. but here goes "The PS3 fans run on a PWM system. They run at 12V all the time, but the 3rd fan wire sends a small voltage to the fan that actually controls the speed. You want to cut the 3rd wire from the fan (gray one) and wire it to a power source. If you send it 3.3V, it will run at full speed ahead captain. You can find 3.3V coming off the PS3 power supply. I usually run some resistors inline with it to slow it down some. This is a very low voltage, so 1/4 watt resistors are fine as we're not messing with the 2.5A 12V, only the small voltage that controls the speed. Now for some reason, different PS3's and different fans react differently to different voltages and resistors. I do this fan mod on each PS3 that I fix from the YLOD, but each resistor amount is different for each PS3. I've had to go anywhere from about 30k to 350k to achieve the same result on different PS3's. It works great though and most of the systems that I've done this on, don't come back after a YLOD fix as opposed to the ones that I didn't do the fix on."