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#11
Just to add my own "fly in the ointment" I would personally like to agree with both of the larger posts above.
When upgrading a system I would suggest that the motherboard and the processor should be matched for the best possible upgrade in all cases other that the replacement of a failed component. I would even go as far as to include memory in this.
The motherboard and processor market both move so quickly that it is never good policy to not change both at the same time
It may mean that you have to put off the actual upgrade until sufficient funds are available but will hopefully prevent the next upgrade cycle from being needed quite as soon.
other more peripheral items may be re-used but I do believe that the Core components, ( pun unintentional :) ), should be treated as a single item when considering an upgrade.