Arctic Liquid Freezer II 420 vs enermax LIQMAXFLO 420

So I want to overclock a 9950x that I plan to built squeezing every little bit of performance up to the pointallowed by the sweet spot on the performance/stability curve or in other words OC as much as possible under the condition that it keeps being stable for everyday usage. >

The thing is though, that I have an Arctic freezer 420 and a 5950x and it barely can handle the CPU getting around 250watts (or in other words the closer I get to 250watts the CPU starts to throttle or to be unstable with long duration temps -when not BSOD- reaching or exceeding 100C slightly )

Now I see that for the “II” Arctic claims “over 290watt”

While Enermax claims to be able to handle 420 watts TDP…

Also they have that threadripper 360 one that claims it can do 500watts !! (enermax liqmax tr4 360 II) which exactly because its 360 AND has a very thin radiator and thin tubing kinda triggers my BS alarm but I keep my reservations since the heatsink is bigger= bigger surface area, and maybe with quick water flow that’s the key to be able to “suck” more watts without overheating.

TLDR: So long story short based on my experience with what AIOs and older zen CPUs can do “and still be stable” I think the sweetspot for what I need is the ability to run the 9950x at 100% all core load at ~95C while feeding it 300 watts of powa.

And to be able to do that “right” I think the AIO should be able to do at least 320-350 watt to have some head room ( Ill put in the spoiler what I mean by that to cut some text off because I already typed a text wall and ppl dont like that lol )

So I guess in order to make that happen and in a way that will keep it stable , so having for a lack of a better word (at least one that I would be able to think of lol ) high inertia in temperature increases, or in other words temperatures should increase at as a slow rate as possible. I have noticed that even if a cooler is able to keep a certain temperature at a certain wattage given to the CPU, the stability can vary a lot depending on how quick it reaches the max temp equilibrium same with effective clock frequency the faster you go from min to max the lower clocks I get

Any 420 should be able handle a 9950X with no issues. Check for proper mounting pressure and applied TIM. I run only a 40mm thick 360mm radiator on my 9950X hosts and never get past 80° C. and that is only for one host with a 3080 Ti in the same loop.

The other hosts with just the cpu in the loop run around 70-75°C.

9950x which I is fed 300 watts **
I am not talking about stock…

I have no issue with 420W consumption by the cpu on my 9950X cooled by a Alphacool 40mm X 360mm radiator with Noctua IPPC 2000 fans.

Load is y-cruncher BBP running non-stop.

I wouldn’t trust enermax after they said they’d fixed the tr4 cooler clogging in a year when they hadn’t