Upgrade from 3820 to 4960X worth it?

[snedie]

Looking to give a bit more life to an ageing system:

MB: Asus RIVE
Current CPU: Intel I7 3820
GPU: GTX 980TI
RAM: Corsair Vengeance Pro Red 16GB
Screen Res: 3840:2160

I'll be replacing the GPU with a 1080TI (or budget permitting a 2080) at the end of the year, should I consider upgrading the CPU first to a 4960X? They're very reasonably priced on fleabay these days, but as always GPU seems to offer the biggest bang for the buck.

Suggestions welcome

 

[snedie]

Yea I keep thinking the exact same thing, throwing money at a dead horse etc. But a new mobo, CPU & memory is going to set me back a whole lot more than just a CPU, and for gaming CPU's really haven't provided much of a benefit for half a decade now so I'm struggling to justify replacing the base hardware to facilitate a more modern CPU.

There are also cheaper options such as the 4820K or the 3960X but those are barely a step up from the 3820 aside from the unlocked multiplier.