Cpu upgrade

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Run CPU-Z to see what socket your core 2 duo is using. To change the cpu, all you need is to find cpu's that fit the same socket. It has nothing to do with the power supply
 

flavallee

Frank
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You didn't say specifically which "Intel Core 2 Duo 2.9 GHz" processor your Dell OptiPlex 780 Small Form Factor has, so I'm going to assume it's the
Intel Core 2 Duo E7500 2.93 GHz
cpu1.JPG

This is the processor you want to replace it with.
Intel Core 2 Quad E8400 2.66 GHz
cpu2.JPG

HERE is a good detailed comparison between those 2 processors.

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