The only GPU that can currently do full UHBR20 (DP80) DP 2.1 bandwidth is the Radeon Pro W7900/7800, which has a single full bandwidth port. The entire consumer Radeon RX 7000 series, as well as Intel's new Battlemage Arc lineup are limited to UHBR13.5.
I looked again and the RTX 5000 series supposedly has DP 2.1 at the full UBHR20 bandwidth.
While the Dell setup probably didn't have the best cooling configuration, there is much one can do to reduce power, generally with only modest impact on performance.
I have three profiles I switch between on my main GPU (an RTX 4090 with a custom loop). The profile I use most often (because I live next to a hydroelectric plant in the North Eastern US where electricity is cheap and the weather not prohibitively hot for most of the year) when playing graphically intensive games is a no-holds-barred ~3.1GHz@1100mV config that uses about 600W for the card alone in ED. However, I also have a maximum efficiency profile which uses sub-250W (a ~60% power reduction) by undervolting the card to ~850mV@~2.5GHz at the cost of 20-25% off peak performance, and an intermediate profile, which keeps to reference (450W) power limits and voltage (1050mV) while being tuned to within 7% of the 600W profile's performance.
Of course, the lower-end the die flavor on the card (and the less complex the board) the lower you can go on power before hitting diminishing returns, but a good rule of thumb is that you can cut listed TDP/TGP in half before efficiency plateaus and performance per watt starts to decline. Laptops are simply tuned this way, with whatever hardware they're equipped with, from the get go, due to power and cooling constraints implicit in the form factor.
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...and it's really niggling me! 
