Upgrading GPU on an old computer/CPU, best choice to avoid bottleneck?

So, I have this PC I built back in 2012. It’s starting to really show it’s age, it’s CPU and GPUs are old, noisy, and use a lot of power due to being SLI.

It’s a 3770K system with two slightly…

Upgrading GPU on an old computer/CPU, best choice to avoid bottleneck?

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