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post #1 of 12 (permalink) Old 09-03-2019, 11:33 AM - Thread Starter
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Hello there,

What do you use to test your overclock?

Is Prime 95 avx with 12k too much?

Like which test is your baseline for a working overclock?

Talking to the veterans here.

Current prime 95 and avx is definitely too much with the smallest ffts and 12k, it is just impossible with this to get a stable OC.

Last edited by Melodist; 09-03-2019 at 12:10 PM.
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post #2 of 12 (permalink) Old 09-03-2019, 12:25 PM
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if it's not stable, it's not stable. there is no "stable enough" in my book. if you're running dry ice/LN2, that's a different story, but you aren't running dice/ln2.

P95 with AVX for absolute CPU heat torture (sometimes linpack), 8 hours minimum, 16 hours pref. linpack will help catch floating point rounding errors. if the residuals are not all identical, it's not stable, even if the program says "PASS". they must all be identical or it's not stable. otherwise if you use other cpu tester's, you will possibly run into a situation where "i can't run this video encoder program because it crashes my cpu, but everything else runs fine"
For RAM, googlestressapp for 16 hours for each setting tweaked (and also confirms if a ram setting is any faster or not), HCI for 1000% or 10 hours (whichever comes first) for final verification/screenshots. most GSAT users recommend 1 or 2 hours, but i've had a single RAM error pop up at the 13 hour mark of GSAT. 1 error = not stable.

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post #3 of 12 (permalink) Old 09-03-2019, 12:31 PM
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I think the latest Prime95 is still the way to go. I do around 6 hours on Small FFTs and 6 hours on Blend (with custom near-max RAM usage) before I feel 99% sure it's stable.

I don't mind taking a bit of a hit in clock speed, if it's rock solid.

But I program, run virtual machines and run BOINC. So I don't want errors or problems with those. People who only game on their machine might feel otherwise.

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post #4 of 12 (permalink) Old 09-03-2019, 02:26 PM - Thread Starter
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Quote: Originally Posted by ssateneth View Post
if it's not stable, it's not stable. there is no "stable enough" in my book. if you're running dry ice/LN2, that's a different story, but you aren't running dice/ln2.

P95 with AVX for absolute CPU heat torture (sometimes linpack), 8 hours minimum, 16 hours pref. linpack will help catch floating point rounding errors. if the residuals are not all identical, it's not stable, even if the program says "PASS". they must all be identical or it's not stable. otherwise if you use other cpu tester's, you will possibly run into a situation where "i can't run this video encoder program because it crashes my cpu, but everything else runs fine"
For RAM, googlestressapp for 16 hours for each setting tweaked (and also confirms if a ram setting is any faster or not), HCI for 1000% or 10 hours (whichever comes first) for final verification/screenshots. most GSAT users recommend 1 or 2 hours, but i've had a single RAM error pop up at the 13 hour mark of GSAT. 1 error = not stable.
What's your prefered FFT, small FFT or smallest?

Quote: Originally Posted by Diablosbud View Post
I think the latest Prime95 is still the way to go. I do around 6 hours on Small FFTs and 6 hours on Blend (with custom near-max RAM usage) before I feel 99% sure it's stable.

I don't mind taking a bit of a hit in clock speed, if it's rock solid.

But I program, run virtual machines and run BOINC. So I don't want errors or problems with those. People who only game on their machine might feel otherwise.
Yeah so smallest FFTs is probably not wise?
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post #5 of 12 (permalink) Old 09-03-2019, 02:39 PM
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Quote: Originally Posted by Melodist View Post
Yeah so smallest FFTs is probably not wise?
I've used Prime since before Smallest FFTs was a preset option. So it's mostly habit for me.

But Small FFTs has a larger range of sizes, so maybe it is better. I'm not completely sure. The description says "maximum" stress for Small and "high" stress for Smallest.

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post #6 of 12 (permalink) Old 09-03-2019, 03:01 PM
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Quote: Originally Posted by Melodist View Post
Hello there,

What do you use to test your overclock?

Is Prime 95 avx with 12k too much?

Like which test is your baseline for a working overclock?

Talking to the veterans here.

Current prime 95 and avx is definitely too much with the smallest ffts and 12k, it is just impossible with this to get a stable OC.
The problem with prime and linpack is that they are simple synthetics that burn/generate heat and don't test well. If it's not stable then it's not stable but the main issue with using these burners is being able to cool the CPUs and not run your benches at 80C+ for 12 hours.
x265/HEVC encoding is what I prefer, complex enough and real world use case. Stuff like prime, linpack and other burners are pretty useless to test for stability. Plus if you set low or default power limits it will throttle hard and downclock on Intel, even with just AVX some CPUs will downclock. So you have to select what you want to test, AVX ratio or not etc.
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post #7 of 12 (permalink) Old 09-03-2019, 03:51 PM
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Quote: Originally Posted by ssateneth View Post
if it's not stable, it's not stable. there is no "stable enough" in my book. if you're running dry ice/LN2, that's a different story, but you aren't running dice/ln2.

P95 with AVX for absolute CPU heat torture (sometimes linpack), 8 hours minimum, 16 hours pref. linpack will help catch floating point rounding errors. if the residuals are not all identical, it's not stable, even if the program says "PASS". they must all be identical or it's not stable. otherwise if you use other cpu tester's, you will possibly run into a situation where "i can't run this video encoder program because it crashes my cpu, but everything else runs fine"
For RAM, googlestressapp for 16 hours for each setting tweaked (and also confirms if a ram setting is any faster or not), HCI for 1000% or 10 hours (whichever comes first) for final verification/screenshots. most GSAT users recommend 1 or 2 hours, but i've had a single RAM error pop up at the 13 hour mark of GSAT. 1 error = not stable.
I'm sorry but this is completely utterly absurd.
I don't want to pour 115C into my CPU just to be prime95 small FFT AVX stable at 5 ghz.
Find me an application that spams the CPU cache without addressing main memory at all and then maybe I'll care.
NOTHING crashes my 5 ghz CPU except small FFT AVX prime95 because it either crashes, hardlocks (LinX 35000 sample size 0.9.5) or reaches 115C (with enough voltage).

More than half of the stable systems here would not be stable if they used small FFT FMA3/AVX prime95 for their stress testing! Heat is unmanageable!!

Do you even know or understand how Prime95 FFT range 4k-112K works?
You do NOT need to be prime small FFT stable (AVX) to claim stability on your computer!
Even Silicon Lottery doesn't do this--they use AVX offsets.

Why? I'll explain.

1) AVX only has equal number of memory access channels as your CPU has memory lanes! Consumer boards are DUAL CHANNEL, meaning that only *TWO* AVX threads can access main memory simultaneously. That is the reason why power draw drops off heavily after the 112K FFT range (FMA3 small range has the most power draw at 112K FFT, while AVX oddly enough has the most power draw at 36K--note I did not test 100K and 96K AVX).
The other stress test programs, real world tests like x264 stress test, Blender (BMW, Classroom, others), Cinebench R20 (3600/7200 second loops), and Realbench 2.56 have less power draw because the AVX threads must access main memory. These are why these are real world tests.

2) Small FFT with AVX disabled is very important as as CPU stress test. This test MUST be passed, because if it fails, it means simply your vcore is too low, and the AVX tests mentioned above will use even more power draw than this (more power draw=more voltage droop=even more instability).

3) you're seriously limiting your overclock potential if passing small FFT/FMA3 is a criteria for your stability. ONLY limited users who do advanced number crunching for a living would need to focus on this kind of stability.

If you want to use real world prime95 to claim stability (this test is going to be harder to pass than realbench 2.56), you need to mimic real world instructions by doing the following exactly as listed:

1) Prime95 29.8 build 6, smallest FFT, AVX/FMA3 disabled (the newest primes let you disable these options directly in the GUI now), set to 2 below the maximum # of threads on your processor or set it to the max # of threads minus memory channels on your processor (9900K=14 threads, 9700K=6 threads).

2) Second instance of prime95, 29.8 build 6, FMA3 disabled, AVX enabled, # of threads=equal to the # of memory channels on your CPU, so 2 for 9900K and 9700K, FFT range 512K-8192K (click blend then custom), time to test:0 minutes.

This is a far more realistic torture test than spamming 16 AVX threads that reside purely in the CPU caches.

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Last edited by Falkentyne; 09-03-2019 at 04:12 PM.
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post #8 of 12 (permalink) Old 09-03-2019, 04:31 PM
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Quote: Originally Posted by Diablosbud View Post
I think the latest Prime95 is still the way to go. I do around 6 hours on Small FFTs and 6 hours on Blend (with custom near-max RAM usage) before I feel 99% sure it's stable.

I don't mind taking a bit of a hit in clock speed, if it's rock solid.

But I program, run virtual machines and run BOINC. So I don't want errors or problems with those. People who only game on their machine might feel otherwise.
Agreed,

I use intelburntest 10-20 loops until my OC can't handle it. At that point I can say ok this is probably my limit or close to it. Then I loop ffxiv-shadowbringers-bench with malwarebytes running a full scan. I browse the web at the same time or whatever I normally do. If it passes my next stress test is daily use.

When you buy a car you could test it at 125+ mph for 24 hours, then tie a giant rock to it and drag it around to see what happens. But unless you plan on doing that when you buy it, it's kind of silly. If you can do everything you want without crashing, I really don't see the problem.






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post #9 of 12 (permalink) Old 09-04-2019, 03:39 AM
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Hi,
I just use blender and it's free demo files bmw at first and classroom to finish up with loop
Render image with use one pass 5-10 minutes on either of the above demo files
Render animation will loop either file until canceled.
https://www.blender.org/

https://www.blender.org/download/demo-files/

There's also a new one I haven't tried yet
https://opendata.blender.org/

After the above I'll use asus realbench and it's stress test on all memory.

Then just normal benchmarks 3dmark/...

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post #10 of 12 (permalink) Old 09-05-2019, 05:29 AM
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Hi,
Yep blender open data pretty good
It renders 6 files
Barbershop
bmw27
classroom
fishy-cat
koro
pavilion barcelona

Says test could take 1.5 hours.
Has cpu and gpu test option too

Quick test is only bmw27 and classroom about 8 minutes.
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CPU
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Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
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evga 1200-P2
Cooling
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Case
corsair 450D with added 2nd floor to house radiator on top
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Redragon Perdition
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Case
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