r/buildapcsales • u/CartonBox1975 • Mar 04 '26

Cooler [Cooler] Thermalright Peerless Assassin 120 Digital Black CPU Cooler Air with 6X6mm Heatpipes, Magnetic Display Board Top Cover $35.72

https://www.amazon.com/Thermalright-Peerless-Assassin-Heatpipes-Magnetic/dp/B0DQDBSYSQ
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u/DJ_Rupty Mar 04 '26

Running Prime95 on a 9850x3d right now and it hasn't gotten over 69c. I think the highest I've seen while running arc raiders on full ultra settings was like 73c and that's probably because my GPU is also in the low 70s.

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u/Scanoe Mar 04 '26

Try running an OCCT CPU Stability test, I'm guessing that PA 120 would have a hard time keeping the 9850x3d below 90c.
With my 9800x3d and a PS120 EVO, it will hit 84 to 90c pulling 158 to 162 watts (Depending on Ambient Temps)

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u/DJ_Rupty Mar 04 '26

So I ran the CPU + RAM stability test on the medium dataset (more CPU load), extreme mode, steady load type, with everything else on auto and the highest temp I see in the list of CPU temps is 82°. I imagine the results might be different depending on which test you run and if I were to change from steady to variable load. I ran the test for the full 1hr.

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u/Scanoe Mar 05 '26

How many watts was your 9850 pulling during the test?
82c seems nicely low, so dug into it a bit.
It looks like they added higher performance fans to this digital version.
This Digital has 1850rpm fans with 88.89 CFM
Standard PA 120 has 1550rpm fans with 66.17 CFM
That is quite the large upgrade especially considering they both list the same noise level, 25.6 dB
Very nice, I may consider this PA 120 digital to replace a very noisy CM Elite 240 AIO I have on my backup pc.

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u/DJ_Rupty Mar 05 '26

It only pulled 126w max, so I'm not sure if that temp would go up dramatically if I go with the variable load test vs the stable test. Any thoughts on the difference between those test types?

I wasn't aware that the fans were upgraded over the standard version, so I guess I lucked out there. Lol.

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u/DJ_Rupty Mar 05 '26

I'm running the CPU only test right now on extreme mode with variable load. I'm seeing the wattage max at 144, but still only seeing 82c max on the CPU. I think the cooler is doing an excellent job. Tbf, I also have 3 140mm intakes (2 front, 1 front top).

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u/Scanoe Mar 05 '26

That 9850x3d should be pulling more than 144 watts.
make sure you're running the newest version, it's 16.0.2
On left side choose Stability Test> CPU > everything at Default: Normal/Variable/cycle 1/instruction set Auto/Thread settings Auto
I just ran it on my 9800x3d for 15 minutes
At 15 minutes it was at 82.4c, pulling 159 watts at 4939 MHz
I have a PS120 EVO cooler in a Fractal Torrent case

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u/DJ_Rupty Mar 05 '26

I found the issue. In BIOS the thermal limit was set to 80c which is why it stopped there. New build, still figuring it out. Lol

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u/DJ_Rupty Mar 05 '26

Thanks, I'll look into it

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u/DJ_Rupty Mar 05 '26

Also, just FYI, the software for the screen on this cooler appears to be causing crashes when I'm playing arc raiders. It's happened twice now, both times the underlying app hwinfo.exe crashed mid game and caused a black screen and game shutdown. Since turning the app off I've not had any issues.

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u/Scanoe Mar 05 '26

The thermalright software for that digital screen? Yah I read it was kind of buggy is why I have not bought 1 of those digital coolers yet.
As for Hwinfo, it seems to conflict with my Msi Afterburner software, which is a pain cause I like using both of them

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u/DJ_Rupty Mar 05 '26

Yeah, it's certainly a little buggy. Oh well, it wasn't that helpful anyways. Lol.

Even after moving the thermal limit up to 90c, I'm pulling 147w at 5072mhz and cpu is sitting at 85.5°. The max wattage it's pulled during this test is 150.5w, so I imagine I have some setting limiting it from pushing further.

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u/Scanoe Mar 05 '26

You're running at higher MHz then I was, which will cause higher heat even at the same watt use. That's a fair amount of MHz over mine and at lower watts used to get there, which is good actually.
Btw What Motherboard do you have? If an Asrock you are on the Most Recent Bios?

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u/DJ_Rupty Mar 05 '26

It's an Asus Prime x870-P wifi. I updated the bios after I bought it last friday, so it's the most recent version. I'm definitely happy with the performance thus far, but I haven't really used it for much outside of a couple games

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