I can salvage a dual 1Ghz processor from a faulty QS for not too much. Would the upgrade be worth the effort or is it a case of diminishing returns? I would mainly be using OS9 with a bit of Tiger on this box. I am assuming that the logic board on both is identical and that the DP cpu daughterboard would simply slot in the same place the 800Mhz cpu sat. I am also assuming the fan noise would not increase appreciably. That is plenty loud enough already.