If I'm not mistaken, the FOP 38 uses a Delta 38CFM fan (black label). If that's the case, don't use the CPU fan header on the motherboard; it will burn out (I know from experience). It worked at first, but then it quit. If this happens while you're away from the computer, say "goodbye" to your T-Bird. If you must use the CPU fan header (for the RPM monitor), there's a simple modification you can do to the motherboard to prevent it from burning out. Simply remove the motherboard from the case and flip it over. Then, soldier a small wire (30 gauge or so) from pin 10 (yellow wire) of the power connector to the middle pin of the CPU fan header. This will supply extra current to the fan. Look in the manual to find pin 10.