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4770K is an old powerhouse. It should be able to handle everything you are talking about with ease. I don't think you really need to upgrade CPU, GPU would be better idea, but only if you really care about modern games.
Things like slightly faster memory or 4.2 vs 4.5 GHz, even newer processor architecture, are not going to make substantial difference for the kind of tasks you're describing.
Of course if you have spare cash and just want to build something new, go for it, but don't be surprised if you won't see any significant benefits afterwards.
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