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You need to check with the motherboard manufacturer, in this case DELL*, for a list of supported processors for your DELL* system.
Keep in mind that the fact that 2 processors are bases on same socket, does not make them compatible with the same motherboard, so that is why all system manufactures and motherboard manufacturers have a list of tested processors for their motherboards.
Regarding 2nd question, you might need to use different fan/heatsink.
Thanks Adolpho for your reply. I'll direct my enquiry to Dell.