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Temperature/Thermal Questions

Hey everyone, I'm somewhat new to the forums and would appreciate your expertise in things I know very little about. I have a dual 500 mhz Gigabit Ethernet and a cube. Both of which I'm going through the motions of upgrading and I have the following temperature related questions:

  1. When I see heatsinks on my logic boards and gpu's (an ATI Radeon 9000 Pro and 7500) that have no obvious way of removing them like I could with the CPU's, is it generally expected to leave those heatsinks alone and NOT put on a new layer of thermal paste? Are they epoxied on permanently? There are no clips/screws/etc, holding these heatsinks on so I assume it's glue.
  2. If they are permanently glued on and I assume the thermal paste/pad underneath them lost its effectiveness years ago, should I be more proactive in getting fans specifically aimed at these components, despite the fact that they were designed to be passively cooled? I should mention that for my cube, I'm putting in a fan.
  3. I don't even know how hot is too hot in the first place? What is the normal temperature range for a G4 and these GPU's at idle and under load? Really what I'm asking is what temperature should I aim to keep these things from reaching?
  4. I'm hoping to upgrade the GE from it's stock dual 500 to something like a dual 2.0 ghz 7448's. Does anyone have any recommendations for aftermarket heatsinks/fans that I can use? Or, would attaching a small fan, say the 40 mm one from Noctua, to my existing dual processor heatsink be enough?
    1. I've also seen a Digital Audio heatsink fan combination pop up on Ebay like this one here. Would this work in my GE?
If anyone has any insights, I'd really appreciate it! Thanks for being kind as I'm sure these questions are quite basic to most of you.
 
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