Games never push your GPU to the same degree OCCT would, but you could still encounter instability issues from time to time. Loads are very different between games - while it would run fine in 9/10 games, the tenth game it starts to crash constantly. Answer from Jaba01 on reddit.com
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Reddit
reddit.com › r/occt › is it safe to use occt ?
r/OCCT on Reddit: Is it safe to use OCCT ?
April 29, 2024 -

Not saying it is not just asking.

My system is Intel i9 14900k and RTX 4090 plus a good amount of fans and a AIO.

Reason I ask is because last time I did a Power test, I think it is called, that testing power supply and mobo it used like 900 to 950 VA watts. I had a 1200 watt power supply but had to replace it. Replaced it with a 1000 watt power supply. Worried if the test uses 900 to 950 VA watts again it will damage my new power supply. Do I have a reason to be worried ?

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Reddit
reddit.com › r/overclocking › how reliable is occt for a stability test?
r/overclocking on Reddit: How reliable is OCCT for a stability test?
February 6, 2025 -

Hello, I have a few questions about OCCT as a stability test. How reliable are these tests? I was testing my GPU overclock using the 3D Adaptive "extreme" test, testing various overclocks. I set +200 on core clock and +1500 on memory clock in MSI Afterburner. Other benchmarks and games were always stable but as soon as I ran the OCCT test it showed me a lot of errors. So I decreased core clock to +150 and left memory clock at +2000 and let it run for another half hour. This time I had no errors. Does this mean that my first overclock despite being stable in games was indeed NOT stable? And does that mean that my second overclock now should be in fact stable as there were no errors?

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Reddit
reddit.com › r/pcmasterrace › is occt good for checking stability of a gpu?
r/pcmasterrace on Reddit: Is OCCT good for checking stability of a GPU?
July 3, 2024 -

I found a 1080ti for a pretty good price of $130, albeit the seller mentioned that the VRAM is bugged in the 1080ti but underclocking it by -700mhz prevents all the bugs. Would OCCT for 1 hour be a good stress test to check that the card is stable? The seller did other benchmarks like Furmark and 3DMark and they seem good, but I'd still like to test OCCT.

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Reddit
reddit.com › r/overclocking › what is the general consensus on occt's effectiveness?
r/overclocking on Reddit: What is the general consensus on OCCT's effectiveness?
September 14, 2020 -

I can run this for 12 hours but prime95 crashes the pc after not even a minute. Since I basically just game I haven't had any issues with this oc yet. Do you think this can be counted as 'stable' when I'll never hit the insane current and general power draw of something like prime95 because it's literally just for games and web browsing? Or do you think everything has to pass hours of prime95 small FFTs? What requirements do you think are appropriate for for which usecase?

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Reddit
reddit.com › r/overclocking › is occt memtest accurate?
r/overclocking on Reddit: Is occt memtest accurate?
January 2, 2026 -

Is occt memtest accurate? It show no error after 30 mins of CPU + linpack + mem + GPU but windows resource monitor show a lot of mem hard faults some times even 300/s I'm running a cheap ahh whitelabel b550m, 5700g with pbo enabled and soc tension on 1125mv, 2 sticks of patriot viper 3200mhz cl18 overclocked to 3800 cl20 also overclocking my igpu to 2200mhz with 1200mv

edit: also sorry if I said something dumb it's my first time getting this deep into overclocking

Top answer
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Man what are these commenters doing on an overclocking sub (more so the guy recommending to stay away from OCCT because the free version makes you wait 10 seconds before tests lmao) Having hard faults is normal, even multiple hundred a second for periods of time. What wouldn't be normal if it's all the time and/or your PC feels slow/laggy/stuttery The one other guy is right, run multiple stress tests. They all test different things in different variations, so a failure in even just one means bad memory. But yes OCCT's memory test is good, run it for minimum an hour though (I believe 2 hours is the maximum for the free version unless they changed that recently). I would also recommend to download Testmem5 (like they also mentioned). 1usmus config is good to run, but absolut by anta777 is the other really good config to use. It's best to do both, but at least do one of them overnight (7+ hours) If it passes on your xmp profile, you don't need to test it with xmp off, though. If it's stable on xmp it will be stable on xmp off If it fails on xmp, you can do an RMA. I'm pretty sure all vendors will accept the RMA if XMP is faulty since it's advertised by them, even tho technically it's only truly guaranteed to be stable at xmp off by the original chip manufacturers (I could be wrong but I think they do accept RMA even if XMP on is unstable but xmp off is stable, someone correct me if that's wrong because I've never had to RMA ram)
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edit: also sorry if I said something dumb it's my first time getting this deep into overclocking Don't worry about it. You shouldn't be seeing that many hard faults per second. Can you download and execute TM5 with the 1usmus v3 @ 1usmus configuration file. If it fails reset BIOS and execute again. If it passes then disable PBO and any user amended settings. Execute the OCCT stability test again and check for errors. Use several stress-testing applications to confirm stability.
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Reddit
reddit.com › r/overclocking › understanding occt
r/overclocking on Reddit: Understanding OCCT
May 9, 2024 -

Can someone please explain why am I crashing on the CPU test with small dataset with all cores no matter the LLC and voltage?

Started to manually tune my r7 5700x, getting to 4.8GHz, no BSODs, games running, cinebench results (R23) satisfying at around 16500, so once I started decreasing voltage I'm now down to 1.3v drooping to 1.275-1.28v (LLC lv3) and it's passing everything except all core small dataset stress test.. Currently cycling cores with small dataset for 10 mins now, no errors so far. LLC LV2 with 1.325 set voltage gave 1.269 in cinebench but it crashed, 1.3 with llc 3 gives 1.275 and its not crashing.

So am I supposed to make it droop more? Or is it okay to just use small data set for single core and cycle them and use all core for medium/large dataset test?

Set parameters are small/extreme/variable/AVX2.

Motherboard I'm using is ASUS X470 prime pro, cooling the CPU with NH D15

I assume it shutdowns on account of thermals, since I can start the test with 8 threads fixed but once it reports close to 95° it just shuts down.

Is that a realistic workload, if thermals are the only problem and I KNOW I will never hammer the CPU with such a workload in real life, is it fine to ignore that test, or just to test up to a certain amount of cores?

Find elsewhere
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Reddit
reddit.com › r/overclocking › occt stability test.
r/overclocking on Reddit: Occt stability test.
September 27, 2023 -

How long to run occt test or any kind of stress test. If pc passes occt, can it be confirm that there are no errors on the specific component

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I thought I was doing good with my OC relying on Prime95 (I would look for errors after an hour), but out of curiosity (I'm new to this BTW) I launched the OCCT stability test and my setup didn't last several seconds without errors. So I don't know but to me it looks OCCT is among the most objectively sensitive to computational errors out there. My example is 8600k I was trying to push to 5GHz with. Cinebench, Prime didn't show any problems to me, I thought I was doing fine, but OCCT wrecked it. I went back to the stock clock and climbed up again but this time testing stability with OCCT and turns out I was not even able to get to stable 5GHz with the voltage I'm comfortable with... I stopped trying at 1.450V. Ultimately I went down to 1.350V which so far gives me a stable 4.8GHz in OCCT (by which I mean 1 hour "CPU" test and 1 hour "Linpack" test without errors).
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occt is a nice test but not the only one to use if you want to test any oc. Always use more, it is a nice indicator for instability tho. Psu powerdraw tests always as long as you feel comfortable with. I would do 20mins to 3hrs on that personally but its your thing. Gpu tests around 5m-1hr or more, very up to what the oc is and what you want to do. If its a low oc and its almost certainly stable, then testing for 2hrs max not be time efficient for 1 slight oc. Same for cpu tests. Its very up to the situation. Only psu tests are always around 20mins to 5hrs to check absolute stability cause thats what many people like to do. Start low
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Reddit
reddit.com › r/overclocking › can occt be trusted?
r/overclocking on Reddit: Can OCCT be trusted?
October 12, 2021 -

I'm running some benchmarks in OCCT and in the first, it has too many error. In the second test, I increase the voltages and no errors where found in the 1 hour test. In the last test, I only did it to sure that the last test is correct, so I only put 30 minutes into it. It runs fine until the very last minute when it starts showing errors.

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Reddit
reddit.com › r/pcmasterrace › is occt safe for vram testing?
r/pcmasterrace on Reddit: Is occt safe for vram testing?
December 30, 2022 -

Hello

I´m suspecting i saw a artifact once and i´m wondering if i could fully test my gpu artifacts

Is occt safe and reliable for this?

If not , what else i can test for artifacts?

Is it mainly a vram issue or could it be something else?

Thank you

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Steam Community
steamcommunity.com › discussions › forum › 11 › 4361249719400921855
Is it safe to use OCCT ? :: Hardware and Operating Systems
April 29, 2024 - No, you need 1200 Watts, otherwise you basically have no breathing room on the PSU @ full loads. For a UPS backup you need at least 1500VA which is approx 900-1000 Watts. You don't need a UPS that can handle the 1200 Watt PSU at 100% load, since ...
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Reddit
reddit.com › r/overclocking › is occt reliable?
r/overclocking on Reddit: Is OCCT Reliable?
October 30, 2017 -

I've spent the last few days trying to dial in an overclock for my maximus hero/8700k system. I've been using OCCT to test stability while running the latest beta version of hwinfo64.

I don't believe I won the lottery so I've been trying for a stable 4.9 all core overclock at reasonable voltages. I can consistently pass cinebench and realbench and dont seem to have any issues in aida64 at around 1.3 vcore. When using OCCT, however, I get errors within the first 10 minutes. I increased vcore to 1.34 (which I feel is quite high) and was able to pass an hour of OCCT with no errors. I turned on xmp and now I get errors within 10 minutes again. I'm using g.skill ripjaws CL14 3200 ram and I've left vccio and vccsa on auto for the time being.

Should I just stop using OCCT and go for stability on the other tests?

Here is a picture of my hwinfo and coretemp following my most recent error in OCCT.

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Reddit
reddit.com › r/phbuildapc › occt stress test - reliable? issues with game crashes, restarts/shutdowns, no signal
r/PHbuildapc on Reddit: OCCT stress test - reliable? Issues with game crashes, restarts/shutdowns, no signal
December 10, 2023 -

Anyone tried using OCCT for stress test? Lately, my pc has been encountering sudden crashes, restarts while gaming and no signal. I tried running Furmark and Heaven benchmark. There are times that my pc crashes when doing a stress test in Furmark but not in Heaven benchmark. Now, I read in a different subreddit about OCCT and tried using it. For several times, I tried stress/stability testing on my CPU, Memory and GPU. All have normal tempts and I haven't encountered a single issue. But when I tried the Power Configuratiom, my pc immediately shuts down/ restarts once hitting start. Now, how reliable is this OCCT? And can I now use it as basis to pinpoint the problem on my pc? This has been stressing me out for several weeks and I can't even use my pc properly for gaming. Because of the several different issues, I can't exactly tell which hardware is the problem. I already updated my gpu with the latest drivers, reseated the RAMs and used the different slots. Temps are normal for cpu and gpu. For context, here is my setup:

• R5 5600 • RX 5600xt • Asus Tuf B540m plus • CM 550w mve v2 • Fury Beast 2x8gb ddr4 3200mhz

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Reddit
reddit.com › r › OCCT
OCCT - Help, Feature requests, Bug reports,...
September 28, 2020 - I have used OCCT in testing different components in my PC. No errors are found by OCCT. I have no other issue with the computer. I purchased the computer in December 2025.