This is what confuses me. It's all very well someone jumping into 4K blind, not really understanding what they're getting in to and just believing the marketing hype... but you actually seem to be aware and prepared for the reality that it won't run games as well as you wantl! And you're right to be concerned, it probably will struggle with certain AAA games if you try maxing everything out, and 1440p won't look as good on 4K as it would on a dedicated 1440p monitor, and ESPECIALLY not as good as it would look on 21:9 1440p. Why exactly are you looking to go 4K?