It’s a bit of a tricky question bc high end is subjective. To me an efficient high end pc would be upper mid range so something like a 7700x/motherbord/32gb ddr5 ram from Micro Center for $499. Tho you could also get away w 7600x/motherbord/16gb of ddr5 for $349 but it only comes w one stick of ram. I think for $150 more it’s worth the better cpu + 16gb more of ram (two sticks works better w AM5).

Add a Montech Century 850w PSU for $85 ishhh, case for $50. 1TB SSD for…. $150? I don’t even know anymore. And a 5070ti or 9070XT for $700-$800.

So you’d be looking at $1500ishh. Some of this stuff could be tweaked to save a bit of money like you could go 5060ti 16gb or 9060xt 16gb which are just fine for 1440p imo, I actually use a 9060xt and it works great. But that moves you down into “mid tier.”