if you dont want to spend that much then just keep your eyes out for sales and deals like anyone else if you want to go this much out of your way to just get gamemode working
The XFX AMD Radeon RX 7000 Series graphics cards, featuring the groundbreaking AMD RDNA 3 architecture, deliver ultra-high frame rates for your favorite games
I built a PC for a friend not long ago with that exact card and can tell you it's beautiful. Very chonky and comes with a metal support bracket that you screw into the PCIe Backplates. Also pretty damn quiet.
tdp slider is not meant for desktops and is specifically meant for steamdeck, the few handhelds it work for it isnt even showing the right values because it thinks it is on a deck
also worth mentioning the two sliders were specifically made for the deck and its CPU.
The first slider adjusts the TDP in the 8-15w range that is the sweet spot of the SD, using a ryzen command that only exists on the deck processor and the gpu hz command does the same
Essentially, the first slider adjusts power draw, and the second one adjust the cpu to gpu bias
i mean back when i started using bazzite the rx570 got stuck at 15W tdp, was my first issue in bazzite and i provided a workaround which people could use until kyle fixed it