I have a CD MBP, and I hear a fan noise on the left side, but not the right. i used smbcontrol and hardware test to make sure both my fans are in good working order. i believe the ati X1600 sits on the left side. it doesn't have a fan too, correct? if not, then why is my left fan louder? smbcontrol tells me both fans are spinning at 1000 rpm (normal idle speed), but the left side produces an audible fan noise, while the right side is quiet. any ideas? much appreciated