IMHO changing CPUs is not very cost effective, especially in a Dell, primarily due to the number of proprietary parts they use - heat sinks, sockets, etc. I usually strip the unit of memory and add-on cards, chuck the mobo and put in a new one with a new processor. I have bashed a number of older Dimensions for friends, putting in MSI or Asus mobos with AMD processors. Sometimes takes some work with a drill and a run through my stand-off collection but the results are satisfying - it looks like a Dell but is sure as hell doesn't act like a Dell...
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If you are determined to go through with it, be sure you have a socketed CPU and that the heat sink is not connected to the motherboard/case in some strange way.
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What CPu it has right now?
And just buy the retail version, it comes with its own heatsink.
As mention check out the HeatSink retention mechanism see if its standard. Also try temoving the old cpu ebfor buyinh another one, just in case its soldered or anything
If it's a Socket 775 processor, it should accept any Socket 775 800 bus non-dual Prescott, and the Dell cooler is probably good enough.
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