Depends on your ambient room temperature for blowing hot air on a already hot part it just makes it hotter
Hey, be realistic - nobody has like 60-80C room temperature - it's more like sauna environment. Normally, cooling air (or water) needs to be at least 20C lower to make decently efficient cooling (other factors apply, too).
On example, during the hot summer days of +35C, my office is cooled with chilled water @ 7-10C (yeah, I said 20C, but the surface of radiator and blower capacity are not nearly what the dimensions require). So, I get ~23-25C, minding the bracketed comment. If chilled water goes to 14C (and it does, my preciouss, it does) - then I have a nice working condition of ~30C - oh, given the company dress code and that The Master insist on this helmet, it's not nice at all...
Not meaning to drag this too long, but benefits of open-loop in water cooling systems (PC ones, no chilled water) are great, except nobody uses them
A bitch to implement, probably...
Closed water loop (read: everything on the market) uses great heat transfer capability of water to cool efficiently. At the beginning... As water reaches 40, and then 60C and onward, its efficiency goes down and good air-blower (say Noctua) performs the same. Blowers on the water-cooling radiators are not enough, and we again get a solution that depends fully on air-blowers - only this time they're on radiator and not the CPU/GPU/both, whatever the setup is.
[And 65W cooling system is totally worth the energy,
some will recognize this and their past mistakes, made in vanity and pride
]
Since I personally like relatively cool hardware, and not mind the noise, my custom profile for both CPU and GPU actually insists on doing 100% on temperatures reaching 50-60C, and though GPU has no-fan option I turned it off forever - you're a f-ing blower and you're going to blow no matter what, no free ride
That aside, I feel strange, unholy attraction to names such as 5600, 5600XT and they associate me strongly on 200-250g budget, emphasizing on 1440p. And I need them NOW. Not in undisclosed term in 2020, where they will be already announced to be replaced by RDNA2 parts...