Question Ryzen 3800XT High Temps

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AA24

Dec 20, 2020
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Hi all,

I recently upgraded my rig from a Ryzen 1600 to a new Ryzen 3800XT and a Deepcool Assassin III air cooler which should be able to handle the CPU but seems to be unable to. During load in prime95 and cinebench r23, I'm seeing temperatures just shy of the 95C limit. I understand that this is synthetic load, but even when playing Call of Duty I'm seeing it spike to 87 or 90C.This has become an issue for me and I can't seem to figure out whether its the cooler (which I've reseated twice), or just the chip itself. Any help would be appreciated!

For reference, the case is an MSI Sekira 100r, but the same thing happens with the side panels off so it doesn't seem to be an airflow issue.

I've attached a screenshot of Ryzen Master below to show what happens within 5 minutes of Prime95

https://imgur.com/a/svZfYxb
 
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This is stock cooler temperature. Not Deepcool Assassin III temperature.

If you see 90C in games with that cooler and that 3800XT your CPU cooler is not properly installed.

Unless it's very very hot in your room this is no Deepcool Assassin III temp.
 
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Mr.Spock said:
the cooler and CPU are fine - even brief spikes to 90' are normal. may want to upgrade the cooler if you OC but this is still within normal parameters
Click to expand...
I understand brief spikes, but sustained 92C temps during synthetic benchmarks seems incredibly high for a cooler rated for significantly more powerful CPUs.
 
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Nemesia said:
This is stock cooler temperature. Not Deepcool Assassin III temperature.

If you see 90C in games with that cooler and that 3800XT your CPU cooler is not properly installed.

Unless it's very very hot in your room this is no Deepcool Assassin III temp.
Click to expand...
This is the conclusion I've come to as well, but I've reinstalled it twice, the screws are tight, paste is applied evenly, I don't quite know what else there is to screw up.... I have no idea what to do about it hence why I've turned to the forums lol

Room temperature is ~73F which is ~ 23C
 
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Nemesia said:
What is your full system specs?
Click to expand...

GPU: RTX 3080
CPU: RYZEN 7 3800XT
Cooler: Deepcool Assassin III
Motherboard: Asus ROG Strix B-350 F-gaming
RAM: 16GB Team Group T-force 3000MHZ
PSU: Super flower 850W 80+ Gold fully modular
Case: MSI Sekira 100r
Operating System & Version: WINDOWS 10 HOME 20H2
GPU Drivers: GEFORCE GAME READY DRIVER - Driver Version: 457.30

Is it even possible to have a defective cooler? Because that's all I can think of at this point.
 
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When you were turning the 2 heatsink screws, did you do so a little at a time, move to the next, and repeat until they stopped?

Did you ensure the thermal paste spread to cover the entirety of the cpu's IHS? The little in the middle application does not appear to be as effective on Ryzen cpus because of the multiple dies. beneath.
 
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Phaaze88 said:
When you were turning the 2 heatsink screws, did you do so a little at a time, move to the next, and repeat until they stopped?

Did you ensure the thermal paste spread to cover the entirety of the cpu's IHS? The little in the middle application does not appear to be as effective on Ryzen cpus because of the multiple dies. beneath.
Click to expand...
When I was installing it, I spread thermal paste over the cpu using the card provided with the cooler, then I put the heat sink on and turned the top screw 4 turns followed by the bottom 4 turns and repeated until the cooler was tightened snugly to the mobo.

On another note i decided to touch the heat pipes coming from the cooler plate and they aren’t hot, rather lukewarm. I don’t know if that’s a sign of anything, but my engineering degree makes me think that’s fine since you need the temp difference for heat transfer.
 
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Yeah, Cold War does run AVX instructions, which produces a higher heat load than the norm.

When you did the test with the chassis open, did you direct a fan into it and monitor cpu frequency?
These cpus are temperature sensitive, and will push for higher clocks on their own if higher cooling headroom is available, so you may not see a significant change in thermals because the cpu boosted 50mhz higher or something like that.
I want to be doubly sure the problem isn't the cooler and not the surrounding cooling.

Then again, what are temps like in bios?
 
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Phaaze88 said:
Yeah, Cold War does run AVX instructions, which produces a higher heat load than the norm.

When you did the test with the chassis open, did you direct a fan into it and monitor cpu frequency?
These cpus are temperature sensitive, and will push for higher clocks on their own if higher cooling headroom is available, so you may not see a significant change in thermals because the cpu boosted 50mhz higher or something like that.
I want to be doubly sure the problem isn't the cooler and not the surrounding cooling.

Then again, what are temps like in bios?
Click to expand...

I’ve officially given up on it and I have reinstalled my Ryzen 1600 and stock cooler. Under the same small FFT test the 3800xt and deep cool assassin ran at 95C, the 1600 and stock cooler are running at a cool 71C at 100% load at 3.4 GHz.

Something is clearly wrong with either the CPU itself or the cooler but it’s not worth my time to figure it out and or deal with warranties. I’d rather wait another year for the new AMD socket or see what intel brings in 2021. Thank you to all who tried to help!
 
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AA24 said:
Hi all,

I recently upgraded my rig from a Ryzen 1600 to a new Ryzen 3800XT and a Deepcool Assassin III air cooler which should be able to handle the CPU but seems to be unable to. During load in prime95 and cinebench r23, I'm seeing temperatures just shy of the 95C limit. I understand that this is synthetic load, but even when playing Call of Duty I'm seeing it spike to 87 or 90C.This has become an issue for me and I can't seem to figure out whether its the cooler (which I've reseated twice), or just the chip itself. Any help would be appreciated!

For reference, the case is an MSI Sekira 100r, but the same thing happens with the side panels off so it doesn't seem to be an airflow issue.

I've attached a screenshot of Ryzen Master below to show what happens within 5 minutes of Prime95

https://imgur.com/a/svZfYxb
Click to expand...
Are you running a fixed frequency...fixed voltage overclock? That's probably the problem, if you are.
 
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AA24 said:
nope, both CPU’s run stock cause I don’t ever mess with overclocking
Click to expand...

That seems not to be true.

Why?

in your ryzenmaster-screenshot PPT is 395 W, EDC and TDC are 255W.

That means, you have PBO-overclocking enabled in the Bios. Switch PBO to disable or auto, and your temperatures will be lower ( with my 3950x, the difference was about 8 degree, although nearly no performance gain).
 
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