In the US, a new RTX 5090 currently costs $2899 at NewEgg, and has a max power draw of 575 watts.
(Lowest price I can find)
... That is a GPU, with roughly the cost and power usage of an entire, quite high end, gaming PC from 5 years ago... or even just a reasonably high end PC from right now.
...
The entire move to the realtime raytracing paradigm, which has enabled AAA game devs to get very sloppy with development by not really bothering to optimize any lighting, nor textures... which has necessitated the invention of intelligent temporal frame upscaling, and frame generation... the whole, originally advertised point of this all was to make hi fidelity 4k gaming an affordable reality.
This reality is a farce.
...
Meanwhile, if you jump down to 1440p, well, I've got a future build plan sitting in a NewEgg wishlist right now.
RX 9070 (220 W) + Minisforum BD795i SE (mobo + non removeable, high end AMD laptop CPU with performance comparable to a 9900X, but about half the wattage draw) ... so far my pretax total for the whole build is under $1500, and, while I need to double and triple check this, I think the math on the power draw works out to a 650 Watt power supply being all you'd need... potentially with enough room to also add in some extra internal HDD storage drives, ie, you've got leftover wattage headroom.
If you want to go a bit over the $1500 mark, you could fit this all in a console sized ITX case.
That is almost half the cost as the RTX 5090 alone, and will get you over 90fps in almost all modern games, with ultra settings at 1440p, though you will have to futz around with intelligent upscaling and frame gen if you want realtime raytracing as well with similar framerates, and realistically, probably wait another quarter or two for AMD driver support and FSR 4 to become a bit more mature and properly implemented in said games.
Or you could swap out for a maybe a 5070 (non TI, the TI is $1000 more) Nvidia card, but seeing as I'm making a linux gaming pc, you know, for the performance boost from not running Windows, AMD mesa drivers are where you wanna be.