Hello
Krytrix. The Samsung CRG9 is a super-ultrawide 1440p (5,120 x 1,440) / 120 Hz / 32:9 aspect ratio display. It's 14,745,600 pixel count at 120 Hz actually represents ~1.78 times the demand of a 4K 60Hz monitor.
In answer to your direct question, "It depends". Which games do you plan on playing across this resolution? Were I in your position, I would do the following to determine the answer:
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questions to self **
What is my upgrade budget?
Which games do I plan on playing?
What would be the fair used sale price of my current CPU and motherboard on Ebay?
Compare selected GPU performance paired with i7-7700K, i9-9900K(KS?), and Ryzen 5 3600. Look at both maximum average FPS and also frame times (pacing). The i9-9900K will likely have the highest FPS, however, determine the opportunity cost of the $300 price difference. Is that money better spent toward the GPU? Maybe, maybe not.
conclusion: Honestly I would probably wait for the release of RTX 2080 Super, and see if the rumor is true: That it will exceed RTX Titan performance. If that is true, then a $700 (USD) RTX 2080 Super and $480 i9-9900K, might represent a better "bargain" than a RTX 2080 Ti. But I would start off with the GPU upgrade first, live with it for a little bit, and see if the performance was satisfactory. That is what I would do.
addendum: Windows license: If it's a retail license then your copy of Windows will remain activated, and if it's an OEM license, then it won't. New licenses can be purchased legitimately for under $30. Anyone who challenges the legitimacy of my statement is welcome to their opinion, but they are mistaken.