Building a dedicated PC for ITG

Need recommendations on CPU/GPU combo. My goal is to hit 240hz to make some faster charts easier to read. I feel like a Ryzen 5 might be kind of overkill just for ITG only. Would a Ryzen 3 3200G pair well with a 1080 or a 980?

im okay with spending a bit more. But I feel like spending $300 - $400 for a dedicated ITG machine would be my goal to hit 240hz.

I honestly feel like I should be able to hit 240hz on a i7 3770k and a 980 no? But something more modern would be better.