I'm thinking right now about my car. I can keep putting money into it... got a rebuilt tranny, had the heads redone, new muffler, new tires, new battery... still needs a new paint job, new alternator, and probably really needs the engine fully rebuilt. But when I stand back and squint, suddenly I realize
This stupid car is worth only $900 or so, total! :Q
Why not back down to 366MHz and cut the fan's voltage to 7 volts by grounding it to the +5V wire from the power supply (the red one in a red-black-black-yellow 4-pin connector)? Essentially free noise reduction. And if 366MHz is too slow, bag it and put the money towards a nice $30 Duron 850 and some sort of cost-effective board, and you'll have about twice the performance of the @566. Just trying to think outside the box...