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Stress Testing bringing CPU temps to 100C instantly

forums.tomshardware.com › threads › stress-testing-bringing-cpu-temps-to-100c-instantly.3702230

I agree with the other posters! ^ It's very possible it's a cooler issue. Although your cooler is rated for 150w, your CPU has a TDP of 125w (at base clocks), it draws much more than 150w at boost speeds, and whilst stressing. In fact it can draw up to 251w (PL2). It's very possible the cooler just isn't adequate enough at high clocks/load. Which Noctua paste are you using? H1/H2 have optimum operating temps between 70-120c, so that paste is good enough. As @hotaru.hino and @dorsai suggested, check cooler is seated correctly. You will obviously have to re-paste. Noctua's instructions suggest best method is to put a pea sized blob in centre of CPU. 2-3mm in diameter. Then seat the cooler. If the cooler has 4 screws, then tighten them in a criss-cross pattern from one corner to the opposite diagonal. This will ensure as you tighten down, you get an even spread of paste. Answer from Roland Of Gilead on forums.tomshardware.com

Tom's Hardware Forum

forums.tomshardware.com › home › cpus

[SOLVED] - Stress Testing bringing CPU temps to 100C instantly | Tom's Hardware Forum

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I agree with the other posters! ^ It's very possible it's a cooler issue. Although your cooler is rated for 150w, your CPU has a TDP of 125w (at base clocks), it draws much more than 150w at boost speeds, and whilst stressing. In fact it can draw up to 251w (PL2). It's very possible the cooler just isn't adequate enough at high clocks/load. Which Noctua paste are you using? H1/H2 have optimum operating temps between 70-120c, so that paste is good enough. As @hotaru.hino and @dorsai suggested, check cooler is seated correctly. You will obviously have to re-paste. Noctua's instructions suggest best method is to put a pea sized blob in centre of CPU. 2-3mm in diameter. Then seat the cooler. If the cooler has 4 screws, then tighten them in a criss-cross pattern from one corner to the opposite diagonal. This will ensure as you tighten down, you get an even spread of paste.

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Yeah I have an old GPU I can try if needs be. I'll see what happens when I remove the RTX from the system entirely and go from there. Haha to be honest, I decided to build this PC not because I needed anything in particular but because I fancied a bit of a project so now I have the means to fiddle with things I may well get obsessed with thermal paste soon too! Yeah, I will definitely get you posted! Thank you so much for your help so far, I've really appreciated having someone to throw ideas at me! No worries, glad to offer help. That's the best thing about TH forum. Everyone bouncing ideas around, learning lot of good stuff as we go along! Love it!

reddit.com › r/overclocking › is it normal that cpu/cpu package to be at 100c for the duration set in occt test ?!

r/overclocking on Reddit: Is it normal that cpu/cpu package to be at 100c for the duration set in occt test ?!

September 8, 2024 -

hi , first of all im new in overclocking and stress testing . Secondly I'd like to know if its normal that cpu/cpu package to be at 100c for the whole duration i have set?! .

P.s : If it helps I have starforge voyager elite 2 , and set the cpu fan profile to MSI ultimate and cpu core to be 5.7 GHzhttps://starforgesystems.com/products/voyager-ii-elite

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Yeah, it's sort of normal that things get a bit crazy in stress tests. Those 100°C sound suspiciously like the speed where the CPU will start limiting its boost speeds. You can have a situation where when you improve your cooling, the temperature doesn't go down because the CPU will just increase speed and boost higher and you'll end up back at the same 100°C. To decide if your cooling is working well, you have to look at the power usage numbers, not just the temperature. Those 100°C are bad if the power usage is low, but if the power usage is very high, then the 100°C are normal.

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5.7 All core is around 320 Watts on a 14900ks with better vids so you need to set a power limit or get a better cooler.

Linus Tech Tips

linustechtips.com › the workbench › troubleshooting

OCCT power stress test yields 100C cpu temps - Troubleshooting - Linus Tech Tips

July 9, 2021 - My pc has been having a bit of trouble lately as it crashes randomly in multiple games. These games include: Rianbow Six Siege, Wolfenstein the new order and remnant from the ashes. It has never crashed on me when i play a less demanding game like Smite. The psu fan filter was full of dust so I c...

reddit.com › r/buildapc › 100 degrees c temps in occt cpu stress test, should i be concerned?

r/buildapc on Reddit: 100 degrees C temps in OCCT CPU stress test, should I be concerned?

May 10, 2025 -

Troubleshooting Help:

What is your parts list? Consider formatting your parts list.

CPU: i5-13600KF

CPU cooler: Thermalright Peerless Assassin

RAM: 32GB DDR5

Motherboard: MSI PRO Z790-P WIFI

GPU: XFX RX 6950 XT

PSU: Corsair 850x (2021) 80 plus gold certified

Storage: Samsung 980 2TB NVMe SSD, Samsung 850 evo 500GB SSD, 1TB 7200 RPM HDD

OS: Windows 11

System BIOS: A. 70

Describe your problem. List any error messages and symptoms. Be descriptive.

I was playing Deadlock on the recent patch and at some point, after about 5 minutes in game, my PC crashed to a blank screen. I still had sound, but my fan (I believe GPU fan) was on full blast and I had to manually restart the PC. After restarting, my second monitor would not be recognized. I fixed this by disabling and re-enabling my graphics driver in windows settings. Now I'm running some tests to find out what happened, and while running OCCT I noticed some high temps under the load from the test. I have screenshot here of the test while it was running. I ran it for a little over 15 minutes with no crashing or issues. What could be causing the crashes? And are these temps cause for concern?

List anything you've done in attempt to diagnose or fix the problem.

Furmark and OCCT tests

Post relevant photos of build/parts here.

Provide any additional details you wish below.

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100C might be concerning, depends on your case airflow and ambient temperature. The bigger issue is the crashing. Modern CPU's should throttle when they get hot, not crash. I would recommend running OCCT in CPU mode with the instruction set on SSE and AVX for an hour each. Repeat with the Memory mode, it also has an SSE and AVX option. Then do 3D Standard for an hour and VRAM for an hour. This should help you find which component is causing instability. PS, 218 watts under load is fairly high for a 13600K. Either your chip is overclocked or you are running an old BIOS version which uses too much voltage. This is known to damage 13th/14th gen chips.

reddit.com › r/buildapc › 13900k-water cooled 100c in occt cpu stress test

r/buildapc on Reddit: 13900k-Water cooled 100C in OCCT CPU stress test

September 18, 2024 -

Hello all, I recently purchased an open box 13900kf/4090 Bitspower water cooled gaming pc from microcenter for $1900 USD. I was planning on building on the am5 platform but the deal was too good to pass up.

In order to make sure my CPU is a healthy 13900kf I’m in the process of running a stress test on OCCT. Immediately upon starting my temps jumped to 100c and then settled around 90c. No errors are detected. I’m coming from a 7800x3d which was a cool 75c in the same test. Is this just how hot the 13900k runs or is there a larger issue at hand here? Thanks in advance for the help!

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have you updated the BIOS to install the micro-code to help stop the 13-14 gen intels from imploding really not a good idea to stress test those CPU's before the BIOS update

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Normal. What CPU cooler? You went from around 82W max cool CPU to could be way over 253W hot beast CPU.

Intel Community

community.intel.com › t5 › Mobile-and-Desktop-Processors › Intel-Core-i7-14700K-reaches-100-C-in-OCCT-test-after-1-minute › td-p › 1672898

Intel® Core™ i7-14700K reaches 100°C in OCCT test after 1 minute. - Intel Community

March 21, 2025 - Intel® Core™ i7-14700K reaches 100°C in OCCT test after 1 minute.

reddit.com › r/occt › is it normal during cpu test duration the temperature to be at 100c?!

r/OCCT on Reddit: Is it normal during cpu test duration the temperature to be at 100c?!

September 8, 2024 -

hi , first of all im new in overclocking and stress testing . Secondly I'd like to know if its normal that cpu/cpu package to be at 100c for the whole duration i have set?! .

P.s : If it helps I have starforge voyager elite 2 , and set the cpu fan profile to MSI ultimate and cpu core to be 5.7 GHz with 1.45 voltage overwrite mode .

Thank you

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Depends on your test settings, but it's very common, especially in the CPU test.

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Yes because your cooling solution is saturated. It's not optimal

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reddit.com › r/overclocking › sos. why is my cpu over heating to 100°c?

r/overclocking on Reddit: SOS. Why is my CPU over heating to 100°C?

May 16, 2020 -

Even after overclocking my 3.5ghz i5 4960k to a "safe" clock speed of 4.2ghz at 1.2 volts, the temperature just bolts up to 100°C while running a stress test (OCCT) with a CPU monitor (HWMonitor). Nothing else was running in the background.

I then turned off any form of overclocking, including Intel's "turbo". I redid the test and the results were exactly the same, the temperature hit 100°C after roughly 1:30 mins of a OCCT small data set test.

I've tried:

Opening the side of my case completely.
Cleaning all the dust out from the inside of my PC.
Replacing thermal paste and making sure of a correct application. (It was actually thermal grease, does that make a difference? On the packet it's stated use was for a CPU.)
Making sure the heat sink is firmly attached to the CPU, yet not over tightened.

However, I am still facing this stressful problem of an unusually high CPU temperature even without being under load . If anyone has any idea whatsoever for how I might go about fixing this problem I would greatly appreciate the input :)

If it's anything like the prime95 small dataset test, the OCCT test will spam AVX instructions which make the CPU draw a lot of power. Haswell CPUs are especially bad for this because there's no AVX offset setting in the BIOS and they still use a really bad thermal paste between the heat spreader and CPU die. This is probably 'normal' behaviour for that CPU in that test, especially because you're using such a small heatsink - I have a 4790k at 4.4 GHz 1.24 V, and even with a much larger Noctua NH-C14S cooler it still hits 100C after a few minutes on prime95 small dataset. The good news is that most applications you'd probably want to use (e.g. games) don't use AVX instructions, and the ones that do will not use anywhere near as many of them as these OC stress tests. Try running the OCCT large data set test as a more realistic measurement of the highest temperatures you'll likely see in everyday use.

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Overclock.net

overclock.net › home › forums › graphics cards › graphics cards - general

OCCT GPU test temps 20c+ higher than anything else. Normal? | Overclock.net

June 20, 2011 - ... That's completely unnecessary and a waste. OCCT/Furmark is good to test your cooling and that is it. Once your temps stabalize, it's good to see how your cooling stacks up. Different games and benches will stress your card differently.

Asus

rog-forum.asus.com › t5 › rog-gaming-notebooks › g750jm-overheating-cores-during-occt-test-bad-processor › td-p › 697160

G750jm overheating cores during OCCT test = bad pr... - Republic of Gamers Forum - 697160

March 6, 2024 - Remember, that processor has a max temperature of 100c, which means it is tested to run continuously AT 100c, it will throttle or power off if the temperature runs away, so don't worry about damage to your laptop running these tests.

Overclock.net

overclock.net › home › forums › graphics cards › nvidia

Very High Temps on OCCT Test. | Overclock.net

Click to expand... But see, I usually get around 60 when playing games that really stress the card. But when I run things like TessMark and FurrMark, I usually get around 70. ... Ok, so I just did an OCCT test on the default clock: 816MHz and 1.05V. *Edit* For some reason I can't find the result, but the Temps stayed 71 and under.

Tom's Hardware Forum

forums.tomshardware.com › home › cooling

Question - CPU hitting 100C under moderate gaming load ? | Tom's Hardware Forum

October 24, 2025 - OP sounds like you have a failing AIO given that everything was working fine before and it's hitting 100C without a heavy load. ... Horrible advice. I had exact same cooler and my temps were 104 degrees in heavy CPU tasks & stress tests. Then I upgraded to ARCTIC Liquid Freezer III Pro 360 AIO and the difference is as a night and day. It keeps my CPU very cool and even in an extreme CPU stress tests, temperature never goes beyond 95 degrees. Air coolers aren't enough anymore for Intel's CPUs. My OCCT stress test with Thermalright Phantom Spirit 120SE:

Tom's Hardware Forum

forums.tomshardware.com › home › systems

Question - Black screen, fans at full speed, GPU driver disabled by Windows. OCCT PSU Test Pushes CPU to 100°C leading to crashes. | Tom's Hardware Forum

January 2, 2024 - Being able to get a 10700K to 100C while using an AIO seems high (unless it's overclocked) especially with it getting clean air from the front. The rest of your temps seem to be completely fine though so I'm not sure if this isn't just an anomaly. As for the random crashes you're describing the only time I've ever seen that personally was a power problem.

Linus Tech Tips

linustechtips.com › computer hardware › cooling

R9 9900x 100c during OCCT Power Test - Cooling - Linus Tech Tips

May 21, 2025 - I just completed my new build. Did a little gaming. Went to bed. Got constant memory error messages when I woke up the system the next morning. Cold booted and everything worked fine. I decided to do a few stress tests to try to identify any issues. Ran OCCT CPU + RAM test for 1 hour. No problem....

Quora

quora.com › Should-I-upgrade-my-water-cooler-CPU-fan-OCCT-test-when-errors-temps-up-to-85-90-C-and-it-crashes-every-time

Should I upgrade my water cooler CPU fan OCCT test when errors temps up to 85-90°C and it crashes every time? - Quora

Answer (1 of 4): Maybe. Are you overclocking? While your temps are quite high when you stress test, they’re not reaching a point where many CPUs will throttle. Of course this will vary from CPU to CPU, but still your problem might be that your just being too aggressive with your OC.

H|ard|Forum

hardforum.com › [h]ard|ware › intel processors

OCCT stress hits 99C 4770K 4.5ghz 1.29v and asus z87-pro with h80i | [H]ard|Forum

December 10, 2013 - **the 28.1 prime95 blend can still hit 100c after 22 minutes.. so while for most stress tests the temps are lower.. she still heats up pretty good with prime95 (with OCCT and AVX max temps didnt go above 82 over 1 hour) I used painters tape to cover the VRMs just in case i started twitching and got CLU all over the place Here are the pics from the delid:

Twitter

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OCBASE

ocbase.com

OCBASE/OCCT : Free, all-in-one stability, stress test, benchmark and monitoring tool for your PC

With a wide range of 3D tests, OCCT recreates gaming conditions, extreme scenarios, and light usage, offering insights into performance across different usage patterns, picking up any artefact or errors during execution.

Overclock.net

overclock.net › home › forums › cooling › water cooling

14900k at 100c | Overclock.net

February 12, 2024 - Something is wrong with your mount if you are seeing 100C in games. Even at 200-225w in games, I only see 60-65C with the Alphacool Core 1. But the Core 1 isn't that much better than other blocks.