Hello
Dxerid. In order to give you a great answer, I first need to ask a few questions:
When you say " I7-2600 (non-k) ", do you mean the Intel Sandy Bridge CPU circa 2011? (
https://www.intel.com/content/www/u...r-8m-cache-up-to-3-80-ghz/specifications.html)
Which specific games do you play, and at which settings?
Are you looking to achieve 75 FPS? If not, what average FPS are you looking to hit.
Do you live in the United States? And if not, which country do you live?
What is the precise manufacturer and model of your monitor, and how much did you pay for it?
How much is your total upgrade budget?
Please list the full specs of your current computer; everything including the manufacturer and model of your power supply.
Summary: The reason that I've asked you to confirm your CPU (and platform) is that with a twelve your old CPU, you currently are, and definitely will, leave performance on the table with your existing and future graphics card. The reason that I ask you which games you play is because it's necessary to know that answer, to determine how much performance is needed to achieve your goal. Knowing your country would be helpful, in reference to how far your upgrade budget would go.
FYI: Purchasing a ultrawide 1440p monitor is the least expensive part of the process. The CPU and GPU needed to support that resolution can easily outstrip the cost of the display. With that being said, it's only 75 FPS, so that's not nearly as challenging as 170-240 FPS.