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?

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?

Hi what test should I run on a new pc/build that everything is fine and is the 1 hour enough?

I never once black screened or got BSOD, the only thing that came up was one error on core #4 so I toned it down to -40. Will be trying to address that error in the future, but for now who cares. Nothing I do with my PC has a problem with my undervoltage. Be nice and civil next time. The title of this subreddit is literally " All things overclocking go here. Learn to overclock, ask experienced users your questions, boast your rock-stable, sky-high OC and HELP OTHERS!" Not bash on others for not having enough proof with only Cinebench and Prime95 tests. Sorry that I got a good CPU? We're all people here. Have some respect. Just because I'm not a fan of the bench program doesn't mean I'm wrong. Lots of people have damaged their components with that program. It's the most stressing benchmark program for a reason.

3 back to back tests on each. I did a total of 4 of them but I didn't realize I did the same one at the end. Thought I chose FIXED instead of AUTO. First and 2nd one are with -42. The last one is -40. Also, the only thing I did different was turn off XMP.

Is there OCCT parameters (settings) to test if one or all your core(s) are too low (-30)? Or another application to test cores for PBO/CO?

Hello, I have been looking to do a per core CO. I have been scouring through this subreddit about how to find a stable CO for each core and found out about OCCT.

A comment somewhere here in this sub said to use OCCT CPU + RAM test with the following settings: large - extreme - variable - avx512.

Also set OCCT to load 2 threads and all cores. Also stop on error.

My question is wouldn't it better to let it run despite errors and then change the CO for the cores that give error?

Also should I start at -15 let the CPU+RAM test run for an hour. If i get no errors, go down a bit more like say -17 and then run the test again?

Is there any other program to help with setting a per core CO and check stability or I should be fine with just OCCT?

Title speaks for itself.

My friend gave me an insane deal for a 9900KS. But now I don’t know what settings to use on OCCT anymore since they updated it.

Need the AVX stability so Prime95 is out. Will test on realbench and cinebench after.

Most good evening.

I’m looking to do a stability stress test using OCCT on my 5800x3d.

Can anyone let me know specifically what settings to use prior to starting the stress test?

I’m not used to OCCT so I could do with an idiots guide on what to set.

Thank you

For CPU is it pretty much large data set / extreme mod / variable load / and avx2 instruction set? How about thread settings, leave on auto?

For memory its just 100% / avx2 / and leave threads on auto right? Or there is no need for this as the test for CPU with large extreme avx2 should also work for memory errors too?

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

Considering getting this for the stability checks it can do on all the systems. Is it good?

New to overclocking, got asus prime z390 + 9700kf recently and followed this https://www.youtube.com/watch?v=bD1Ze80GpLo guide to a t and then got about 4k errors in less than 2 minutes before pc went into blue screen. Is there might be some problem on my part or this test is just garbage?

How long do I need to run OCCT with medium and large data sets to be considered stable?

Hey hey!

So I just finished testing my CPU using Cinebench 2024 and Aida64 - I ran each for 10 minutes without any issue. (+200 with -20 curve and temps didnt go above 83C)

I am now looking to stress it using OCCT, so any setting you can recommend for 9950x3d?

Thanks!

Doing a 9800x3d OC at the moment. Trying with PBO MB limits, FMAX 200, CO -30, Scalar 10x. I'm wondering which stress test should I trust more for just a gaming and general browsing daily use?

I've set OCCT on multicore, extreme, steady load and notice that it's a test that uses far more power than Aida and maintains higher clocks. So far early 10 min runs have passed

However using AIDA FPU, CPU and Cache test CPU uses far less power yet the test fails almost immediately.

So I'm not really 100% on which one should I trust more.

Hi, just a quick question as I recently built a new PC (7800x3d / 4080s): should I use OCCT to stress test components?

I just had a blue screen a few months ago which didn't happen again, so I don't really have too much reason to stress test (no overclocking either) but I was wondering if you still used it for good practice.

AMD ZEN 3 PBO & CURVE OPTIMIZER OVERCLOCKING GUIDE

DISCLAIMER

• By unlocking PBO limits you are violating AMD’s stock configuration and therefore invalidating your Warranty

• Even though this guide is aimed at everyone, I am expecting you to at least know some of the basics about how ZEN cpus work, this includes PBO, PBO limits, navigating BIOS, troubleshooting potential issues that arise, etc.

• Some of the things in this guide will vary from CPU to CPU due to but not only, silicon quality variation, cpu SKU (5600, 5800, 5900, 5950X), cooling method used, RAM setup, Operating System bloat, etc.

SOFTWARE

• HWINFO64 (https://www.hwinfo.com/download) - Monitor temperatures, clock speed, voltages, etc.

• CPU-Z (https://www.cpuid.com/downloads/cpu-z/cpu-z_1.98-en.exe) - Quick and dirty benchmark for single and multi-thread performance

• OCCT (https://www.ocbase.com/) - All in one stability testing tool, very good, also support the developer, really nice guy

• CoreCycler (https://www.overclock.net/threads/single-core-prime95-test-script-for-zen-3-curve-offset-tuning.1777112/) - Very decent tool to complement OCCT, to test each core individually. Props to blu3dragon from OCN for this tool.

• Ryzen Master (https://www.amd.com/en/technologies/ryzen-master) - Tool to monitor % of TDC and EDC values during testing.

• Other software to validate performance gains such as Cinebench R20/23, 3D Mark suite, Geekbench,gaming benchmarks, etc, can be also used.

PRECISION BOOST OVERRIDE aka PBO

• PBO ADVANCED

Inside your BIOS, enable PBO and select PBO advanced, this will bring up a bunch of options:

• PBO LIMITS

The value for these limits varies hugely from CPU to CPU, some CPUs scale differently, specially with TDC and EDC combo. Also, SKU matters, the values for a 5600X are absolutely not the same as the ones for a 5950X,

There’s 2 approaches to these limits and I will share the approach that is more user friendly but not the one that will necessarily yield better performance. Further testing for those who want can be done.

Load up BIOS defaults, go into PBO menu and enable advanced. In the advance section of PBO, set PBO limits to motherboard or manual and set values that you won’t realistically hit. Once you do this, boot into Windows, open Ryzen Master and start CB23 multi thread test. Observe TDC, EDC and PPT values and check what % of the max you are hitting. This should be a good starting point as the values to pick for PPT, TDC and EDC.

For people who want to go further, you should play with TDC and EDC combo for higher results, even a small variation can be enough to squeeze a bit more performance.

• PPT (W)

200W is enough for 5600, 5800 and maybe 5900X SKUs. For the 5950X this value is very important because given the chance your CPU will not hesitate going there given the workload. Cooling here is very important because not many cooling solutions will effectively cool a 5950X at 250W. My advice for 5950X users is to use a value between 200 and 300W and test accordingly to your type of workloads.

• TDC (A)

Somewhere between 90 to 150A on 5600, 5800 and 5900X. For 5950X, between 140 to 220A. Test accordingly in CB23 because even a small variation of 5A might bring big gains in multithreaded performance. CPU-Z also a good way to quickly measure performance changes, but it’s not as sensible as CB23.

• EDC (A)

Somewhere between 120 to 200A on 5600 5800 and 5900X. For 5950X, between 140 to 220A. Test accordingly in CB23 because even a small variation of 5A might bring big gains in multithreaded performance. CPU-Z also a good way to quickly measure performance changes, but it’s not as sensible as CB23.

• PBO SCALLAR

Change this to x1. This way you assure PBO will not try to override the FIT controller into using a higher level of voltage for longer.

CURVE OPTIMISER

This is where all the magic happens, really. This is the single best tool AMD has provided Zen 3 users with. This is the tool that makes the guide come together into a very beautiful thing.

What Curve Optimiser does is apply a voltage offset, positive or negative, to each individual (or not) core’s VID. Basically, AMD CPUs (and Intel and any other CPUs but we’re focusing on AMD here) use a standard “fit all” CPU voltage/frequency curve because individually binning each CPU would take forever and would not be cost efficient. What Curve Optimiser lets us do is tune this curve ourselves so that even the crappiest CPU can take advantage of lower operating voltages and temperatures while increasing performance.

Anyway, testing… The boring part but the most crucial. I prefer to do individual core testing. For this, load up PBO, Advanced, and go to Curve Optimiser. Inside Curve Optimiser, select per core. In this menu you will see your cores, select negative on each of them.

Normally people will tell you best cores do less undervolting and worse cores do more undervolting and while this is true, we cannot forget Curve Optimiser offsets are an order of magnitude and not an actual value. Just because a core does -30 and another -25 it does not mean that -30 > -20 in absolute terms because the core that is at -20 might already be requesting lower VID to begin with.

Either way, we can start by setting each core at -10. Now what I would suggest you to do is to either use OCCT or CoreCyler. I prefer CoreCycler myself.

• OCCT

In OCCT, select Test, CPU, Data Set - Large, Mode - Extreme, Load Type - Variable, Instruction Set - AVX2. In the threads section you can select advanced, physical only, select all cores, and on core cycler section, select cycle active core every 5 minutes.

This ensures you test every core with cooldown intervals between them while sort of simulating what would go on during a game or similar workload where load keeps switching between cores.

Alternatively you can run SSE instruction set and medium to small data set. This will better simulate a gaming load I believe.

• CORECYCLER

Pretty straight forward, once you set it up, run it and leave it running. It will automatically keep note of the cores that failed and will automatically skip them for the next tests. Leave it running for the whole duration for faster testing. Do not stop just because a core failed.

• TROUBLESHOOTING

Obviously, some cores will fail and some will pass. If the cores pass, you can go -5 (so if you’re at -10, you go -15), for the ones that failed, depending on how fast they failed on CoreCycler (1st, 2nd or 3rd test), I would reduce accordingly. If it failed on 1st test, it means the core simply cannot handle that undervolt. So back off +5, if it fails on 2nd or 3rd test, you can back off +3 or +2 (so if you’re at -10 you go -5, or -7 or -8). For OCCT, I don’t think there’s a cause/effect where you can deduce how bad a core is, I guess if it fails fast it’s bad…

Hard reboot? Don’t know why? Was idling and crashed? Don’t worry, Windows has a beautiful tool to help us determine what core is giving us issues. Go here and check this guide I made about troubleshooting (https://docs.google.com/spreadsheets/d/1SiLpWVL4-T3vdHZKPA2TELPKa7TbJyCGF_JJdjsHdLg/edit#gid=1831618223)

Another tip, from my experience, bad cores (use HWINFO for this) will usually undervolt a lot, we’re talking -20 to -30, while fast cores will be usually below -10. This can help you speed up the testing process.

AFTER ALL OF THIS IS DONE, BACK OFF -1 OR -2 ON EVERY CORE TO ENSURE MAXIMUM STABILITY.

FREQUENCY OVERRIDE

This value goes from 0 to 200 Mhz since AGESA 1.1.0.9. whereas previously it would go up to 500 Mhz on MSI and ASUS boards. This value basically tells PBO to try and boost as high as it possibly can. Too high and you get clock stretching, too low and you leave performance on the table.

I usually recommend going straight to 200 Mhz. Keep in mind that this value is hugely tied to curve optimiser, without it, you’ll be leaving a lot of performance on the table. Also, the maximum will probably only be achieved by your 1 or 2 best cores and only by very small periods of time. If you have good cooling (big AIO or custom loop), sustaining this during CB23 Single Thread test is actually possible. CPU-Z single thread is a very fast and somewhat reliable test to check for changes in single core performance. For this, simply select the thread box and chose 1. This will only use 1 core and you can affectively measure 1T performance.

• DISCLAIMER: CPU-Z uses Core 0 by default for it’s 1T benchmark so if Core 0 isn’t your best core, it’s natural you won’t see as big of a gain, however, it’s still there. To get around this load CPU-Z on your best core and try again.

GENERAL NOTES

• Do not set manual Vcore voltages

• Do not change stock/auto LLC (Load Line Calibration)

• Do not change Scalar from x1.

• Cooling is very important, PBO scales with temperatures, after 50C you lose Mhz for each degree you climb. Good AIOs or Custom Loops are pretty much essential for someone who wants to milk the last bit of performance.

• RAM tuning is similarly if not more important for Ryzen CPUs than PBO and CO tweaking. I would strongly advise everyone and their mother to read this insane guide by fellow members of the OC discord server. (https://github.com/integralfx/MemTestHelper/blob/oc-guide/DDR4%20OC%20Guide.md). As an eample, I tested SOTR benchmark between 3600c16 XMP, 3600c16 tunned and 3800c14 tunned setup and gained over 40FPS AVERAGE on my own setup. Seriously, the gains are ridiculous, much more than this. Games that are very CPU bound such as Call of Duty Warzone will see INSANE gains... I cannot stress this enough, a 6700XT is enough to max that game out graphically, don't listen to people on 3090's with 100 FPS... It's totally CPU bound. Tune your RAM, tune your CPU and you will see insane gains on most games that are CPU bound (RTS, MMO's, MMORPGs, etc.)

ADITIONAL STUFF

Wouldn't be an overclocking guide without some test results right?

Here's my own 5800X on various benchmarks:;

CPU-Z - https://valid.x86.fr/v6k4aw 702 ST - 7072 MT

Geekbench 5 - https://browser.geekbench.com/v5/cpu/6488736 / https://browser.geekbench.com/v5/cpu/6451542 - 1841 ST - 12270 MT (one of the fastest Zen 3 CPU on normal cooling)

CB23 - My PR is 16800 MT and 1690 ST, usually hoover around 16500 (https://cdn.discordapp.com/attachments/802676130741223437/903756463875424288/2541314.jpg)

TS CPU Score - my PR is 14000+, usually hoover around 13800 area (https://www.3dmark.com/spy/22201612)

CPU Profiler on 3D mark - https://www.3dmark.com/cpu/75741 (one of the fastest scores under normal cooling)

Yesterday i was messing with ram and doing some gpu tests to heat the ram/gpu.

I noticed OCCT standard test is now gone and been fully replaced with the 3d adaptive test.

I put the 3d adaptive test to extreme and it seems like the power draw is not as bad as the 3d standard which seemingly pegged my gpu near max the entire time.

However, suprisingly, i had 20 gpu errors in 2-3 mins. Before this i had ran standard test many times + i've gamed on this gpu for a long time now.

Originally i had +235 @ 0.95v on a 4090 suprim. Then i bumped it down to +195 due to abiotic factor and cyberpunk crashing.

This test however, wouldn't stop crashing till i got to -150, i bumped it down to -135 just to be safe.

Seems like a really good test for undervolting gpus. the +235 was stable in Alan wake maxed @ 4k, silent hill, i played Portal RTX @ +195 too, i'm not sure if there's anything better than 3d adaptive test right now.