Question Upgrade GPU or build new computer?

Jun 25, 2019
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Hello,

I am somewhat of a novice but I built a computer around 5 years ago with an i7-4790K, 16GB DDR3-1866 RAM, GTX 780, 850W power supply, monitor is 1080p 60Hz. I have noticed some FPS drops at ultra/very high settings in some games and am debating whether to upgrade the GPU or just leave it, dial down settings, and build a new computer when things get really bad. My motherboard does not allow any better CPU so I was considering upgrading the graphics card to a 1660ti or 2060. Anything better seems like it will bottleneck. My question is whether a gpu upgrade is cost effective/will it give me a few more years or are the other components too old to justify it? I am fine doing 1080p at 60hz and I usually wait to play games when they are a few years old and less than $20. It seems like most current games run well on those cards at 1080p but are usually tested with better cpus and RAM. Thanks for your help.