dell optiplex 780 c2d to I5 upgrade

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@BenjaminVitolas23 wrote:
So the only way to upgrade to a i5 it has to have a i3 atleast on it?

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Of the same processor generation/series and even then there are potential CPU incompatibilities to do with package, cooling and power.

Here is a link to the different Core-based processor generations like Nehalem, Sandy Bridge, Haswell, Skylake, etc.

https://en.wikipedia.org/wiki/Intel_Core