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It's not a statement to remove the max temperature. The max temperature doesn't just go away because it's a limitation they set on the hardware.
Ryzen is very sensitive to temperatures above 80 C as it is.
https://www.amd.com/en/products/cpu/amd-ryzen-9-3900x Still shown for the 3900X.
https://www.amd.com/en/products/cpu/amd-ryzen-7-3700x and 3700X.
https://www.amd.com/en/products/cpu/amd-ryzen-7-3800x and it's still clearly shown for the 3800X, so I don't know where you're getting your misinformation.
3800X isn't really better, considering the 9900K still beats the 3900X and the 3800X is just barely equal to the 9700K in some situations.
Its not like I always say that AIO are not really better then air coolers... but as so many still think water cooling is superior because someone keeps parroting it while they dont know what they talk about... you find it out after paying the big money.
AMD CPU's dont really have more heat then Intel CPU's. They are about the same. Besides Intel HEDT easily reaches twice to trice the heatoutput. But then again higher temps does not mean that it produces more heat (as matter of fact Intel HEDT produce more heat but stay colder because of the larger die and IHS).
Actually, there isn't much of a difference. It takes longer for the heat to build up, but when the heat saturates the loop, the total temperature when using most 240mm AIOs is not any better than a beefy air cooler like the Dark Rock Pro 4, and many 120/140mm CLCs are barely better than cheaper air coolers like the Hyper 212 EVO.
280mm and 360mm models are a small bit better because of greater heat dissipation due to radiator surface area and better/more fans, but an air cooler with enough heatsink surface area can still match a good CLC. Part of the reason is because most CLCs don't have particularly amazing pumps, which affects how quickly fluid moves throughout the loop.
Custom loops/Open loops are what make the difference between air and liquid because of the pump quality and potential for more surface area if one uses more than one 360mm radiator to cool their CPU.
I have a Deepcool 120EX that I tested against the Wraith Prism with my 2700X in my second build, and it's literally not even any better than the Prism.
There's also the issue of constantly exposing AIOs to extreme heat; liquid expands, and it can cause ruptures in tubing and other issues with the unit and possibly cause a pump failure -- which in turn makes things worse as the CPU heats up even more along with the fluid temperature. It's a domino effect that can potentially cause a leak.
So, for CPUs that generate a great amount of heat, air cooling is usually the better and safer bet if it's going to be under heavier loads for a sustained amount of time, as temperatures exceeding 90 degrees can increase the risk.
and how is the water cooled down?
mainly the pump failing as the pump is pumping the liquid through rotation which causes heat and that is cooled down by the liquid aswell.
Not really. In the end both are a copper plate grabbing the heat and cooling it down via fan air cooling.
Most beefy air tower coolers can do just as well for under $70 that you'd easily spend at least $120+ on to do that via AIO LC unit. And also you won't have to worry about liquid or warranty, as that pump will live a short life. With an air cooler, all you have to worry about is that it being more then that cpu needs, which helps to do should you OC the cpu, and then there is the fan(s) which if die, you can easily replace.
AIO LC just has a nicer/cleaner appearance is really all, not much more.
Both have fans and dust. One has a pump that will die, not to mention it has liquid within. Air coolers can cool just as effectively, plus they can cool the ram and vrms also and won't die out.
If you use an AIO LC then I can't stress enough how I highly recommend you use a Case that allows for extremely good airflow, such as not having any 5.25 inch bays, so you have more airflow at the top-most front area blowing towards the motherboard better compared to other designs. And one where the AIO RAD can mount at the front of the case. And also that you populate the case with MANY fans to ensure good overall airflow.
So in terms of medium, you are correct. At the end of the day, it's all air cooled. But, the big advantage of water cooling is that your dumping the heat directly outside the case via a radiator. If properly designed with custom heat pipes, you could in theory design an air cooled solution that provides the same advantage.
With air cooling, you still need more case fans to move air through to remove heat buildup. It's not good for the CPU, GPU, or MB. And because of the extra fans, it's more noisy.
That all said, I don't like water cooling. Been there, done that. Have had a pump or two fail and an air lock, both with custom and an AIO. So, water or air cooling, pick your poison.
Your AIO should always be intake, not exhaust... You get better CPU temperatures with the AIO as the main intake of the case, with little to no GPU temperature penalty, partially because GPUs are better designed to recycle hot air.