An AIO for Ryzen 9 3900X ?

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While still waiting for my 3900X to get in stock, I have been looking at some proper cooling for the CPU in an ITX case (I'm using Sharkoon QB One). I am not sure whether to go with a 120mm AIO and if it can handle the 3900X ? (not planning any overclock) or if I should go with a 240mm AIO ?

I found a NZXT Kraken M22 on sale for £47, but then again not sure if a 120mm is enough ?
I also found a Corsair Hydro H100X 240mm AIO on sale for £57, but I am not sure if it's a decent quality AIO compared to NZXT Kraken X52 ?
 
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I have a 240 and 280 thick radiator, with 6 mag lev fans and at stock im getting 78.c under full load.
You are definately going to need a 240mm aio, as long as its a semi decent one it will do the job maybe add 2 extra fans for push pull if you have space?
 
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Well that's the question, what is a semi decent AIO ?

That seems to be quite an high temperature even with all that cooling for a 3900X with just a 105watt tdp. I have been using a Noctua NH D9L dual fan on a core i7 [email protected] and it managed to keep that 140watt tdp (with OC more of 160watt tdp) cpu just under 80°c in AIDA 64 FPU stress test.
I was also thinking of just reusing that cooler on the 3900X.
 
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Well that's the question, what is a semi decent AIO ?

That seems to be quite an high temperature even with all that cooling for a 3900X with just a 105watt tdp. I have been using a Noctua NH D9L dual fan on a core i7 [email protected] and it managed to keep that 140watt tdp (with OC more of 160watt tdp) cpu just under 80°c in AIDA 64 FPU stress test.
I was also thinking of just reusing that cooler on the 3900X.
That will do fine on the 3900x as well.
It uses more than 105tdp when it self boosts and there is so much heat in such a tiny little chip that it is hard to dissapate it all away quick enough
 
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Alphacool Eisbaer Extreme 280mm can be had for £170. Certainly one of, if not THE top dog.

That is also a great AIO, but it won't fit the case, and its also a fair amount more than I'd be willing to pay for cooling a cpu that will run stock clocks :)
QB_ONE_09.jpg
 
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These Ryzen chips are weird. I'm running stock clocks on my 3800x, but I find that I get better performance the more I cool the thing... Currently running a H115i and Ryzen Master will still report high 80's under sustained load.
 
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These Ryzen chips are weird. I'm running stock clocks on my 3800x, but I find that I get better performance the more I cool the thing... Currently running a H115i and Ryzen Master will still report high 80's under sustained load.

It's not weird as such, just the design of the CCD and how the power package boosts with voltages within the FIT. The issue is more is getting the heat transferred out of the tiny 74mm² CCD itself, before you even consider trying to transfer heat from the IHS. So whilst larger more competent coolers and blocks may help, the main issue is before them.

If you compared it with the 9900K which has some notoriety on the subject:

9900K has a theoretical intensity of ~1.15W/mm² when operating at 5.0GHz (200W @ 174mm²)
Zen2 can easily reach intensity of > 1.5W/mm² (120W+ @ 74mm²).
 
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Well that's the question, what is a semi decent AIO ?

That seems to be quite an high temperature even with all that cooling for a 3900X with just a 105watt tdp. I have been using a Noctua NH D9L dual fan on a core i7 [email protected] and it managed to keep that 140watt tdp (with OC more of 160watt tdp) cpu just under 80°c in AIDA 64 FPU stress test.
I was also thinking of just reusing that cooler on the 3900X.

105W TDP as AMD describes it is 145W power draw. Intels TDP is also vastly lower than power consumption but whatever, they're both playing games with TDP.

Anyway temperature doesn't mean its using a lot of energy, it just means it's harder to cool due to smaller chips. The heatspreader can only transfer heat from the area of silicon it touches and if you make the silicon chips smaller then there's less contact surface to draw the heat out. Essentially bottlenecking heat transfer.
 
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Corsair H100i v2, 3900X running stock.
Idles in the 35-45 range (mostly near the top of that) and loads in the 55-60 range.
Room is usually in the 22-23 range for reference.
 
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