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post #1 of 8 (permalink) Old 11-14-2019, 05:14 AM - Thread Starter
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Need help with 3900X & AIO

I just built the machine from my sig and the temps seem a bit high.
CPU is stock with PBO etc all on auto.

In a closed case 1 front 140mm brings cool air, one back 140mm takes hot out, the AIO is on the top 2x120 taking hot out, room temp 24C and using Thermal Grizzly Kryonaut.

Cinebench R20 all core temps hit 80C.
Prime95 temps only hit 70C weirdly enough.
Battlefield 5 1080p ultra never goes above 65C.

I am coming from 1700 with an AIO and these 3900X temps seem high for the Arctic Freezer II 240 which in all reviews performs like a champ.

Do these temps look normal or should I e worried about maybe installing the cooler wrong or something else?

Any input is much appreciated.
Many thanks!

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post #2 of 8 (permalink) Old 11-14-2019, 05:27 AM
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I don't think that's too bad for temps really.
Edit: disregard what i typed below... misunderstood your case airflow . Could try a similar experiment with your radiator fans though - would give you an idea of case pressures.
Might be an interesting experiment to unplug the front intake 140 and see what happens. Left without power, the direction it spins will tell you if you are hindering airflow through the radiator.

Last edited by cssorkinman; 11-14-2019 at 05:34 AM.
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post #3 of 8 (permalink) Old 11-14-2019, 06:21 AM
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My 3700X runs similar hot and it only has 1 CCD. Other than are you pushing the air through rad(Fans mounted on the rad and rad to top of case) or pulling the air through(fans mount on the top inside of case and rad on the inside.)

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post #4 of 8 (permalink) Old 11-14-2019, 06:27 AM
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1 intake feeding 3 exhaust fans, I wonder what's wrong, nah I'm pretty sure, it's the user's fault.

Put the AIO as intake if you want it to perform better.
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post #5 of 8 (permalink) Old 11-14-2019, 06:28 AM
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LF II 240mm is a small unit that performs a bit worse than D15, your temps are very good. You'd fancy use a fan or two more on the front.

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post #6 of 8 (permalink) Old 11-14-2019, 07:02 AM - Thread Starter
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Quote: Originally Posted by CDub07 View Post
My 3700X runs similar hot and it only has 1 CCD. Other than are you pushing the air through rad(Fans mounted on the rad and rad to top of case) or pulling the air through(fans mount on the top inside of case and rad on the inside.)
Fans are pushing the hot air through the radiator.
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post #7 of 8 (permalink) Old 11-14-2019, 09:02 AM - Thread Starter
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Did play around with it some more and here are the results:

I turned on PBO instead of auto and turned on AutoOC and set it to 200mhz.
To my surprise, it really did bump up the speed by ~200mhz.

So I ran prime95 and it set all cores at 4.0 (prior to PBO and AutoOC they stayed at 3.8).
The CPU used 190W (I checked the wall with a meter not only hwinfo) and the CPU didn't go over 85C.

I think 85C max temp at 190W in prime95 is ok but let me know what you think.

BTW I use Ryzen High-performance power plan.

Asus X570-P | Ryzen 9 3900X @ Stock | Arctic Freezer II 240 AIO | Corsair Vengeance LPX 2x8GB 3600 @ 3600 | Sapphire Pulse 5700 XT @ Stock | ADATA 8200 Pro 1TB | Seasonic 850W Gold | Be Quiet Pure Base 500 | Asus VG279 27" 1080p Freesync

Last edited by ursidae1; 11-14-2019 at 12:48 PM.
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post #8 of 8 (permalink) Old 12-03-2019, 04:15 PM
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Put both (front & rear) 140mm fans as intake and the AIO as exhaust. See if temps are better, they should be.

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