So I have a Dell Optiplex 3020 and want to upgrade the CPU to something more powerful but I'm not sure what Cpu are compatible As I have an intel i3-4150 3.50 GHz installed
You seem to have a lga 1500 motherboard, that means If you are only upgrading the cpu your options are limited to Haswell and broadwell desktop cpus, generally means intel 4th and 5th gen cores. It makes more sense to build a new pc if you do want a large performance boost. But if you insist on keeping the current pc, i7 4790k would be the best you can get, and i5 4590 would be a budget choice.
I agree with this, small typo though - it's an LGA 1150 motherboard.
i would not waste time on that old dell a processor upgrade (if possible) WILL NOT MAKE YOU HAPPY
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