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You need to contact the motherboard manufacturer so they can provide you a list of fully supported processors for that particular motherboard.
As soon as you have the list of supported processor models for your laptop, you can check this link:
To find the best processor for your needs.
Since Intel only manufacture Intel motherboards, we are not familiar with DELL* motherboards, so we cannot tell Intel processors will work on third party motherboards.
Only the motherboard manufacturer, in this case DELL*, is the one that can tell you which processors will work on their motherboards.
i think we're going round in a circle here, but thanks anyway for taking the time to reply