I just replaced the processors in my 2006 Mac Pro and they've provided a big boost. Lots of instructions on the web, just google it. The original processors were the 2.66 Dual-Cores and I swapped them with 2 x 2.66 Quad-Cores: two X5355 processors that cost a total of Euro 120 shipped. The prices have really come down.
As to fans, I have what sounds like a noisy one that makes a "plasticky" sound, as if it's going to rev up, but then stops. But it isn't the front or rear fan. I can hear the noise about the middle point of the top of the computer, as if behind the hard drives. Is there a fan there?
Does anyone know where to get a service manual for the 2006 Pro?
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