AVX ratio offset OC

salm2s · Aug 23, 2018

Hi there,
I am trying to OC my 7600k to 4.5 Ghz. While messing around with the settings, i came across a setting in the bios called “AVX Ratio Offset”.

Do i need to mess with this? If so, how much should i put.

Oh and i have a asrock z720 Pro 4

Thanks,
salm2s

zebarjadi.raouf · Aug 23, 2018

AVX Ratio Offset

We a something called Advanced Vector Extensions(AVX), a new type of calculation/instruction method. The problem is, it creates too much load on CPU and overheats it. AVX ratio offset is usually set to negative 2. That means it will use 4.5GHz for non-AVX, 4.3GHz for AVX to lower temperature.

Also, Popular programs that use AVX are:
https://en.wikipedia.org/wiki/Advanced_Vector_Extensions#Applications
+ Every new stress test. Like Prime95 26.6v+ which everyone is scared of.

salm2s · Aug 23, 2018

zebarjadi.raouf :

So what programs should i use to test my stability? I know that OCCT uses AVX as well, so should i use that. And should i set the AVX offset to 2.

zebarjadi.raouf · Aug 23, 2018

So what programs should i use to test my stability? I know that OCCT uses AVX as well

Whatever you like. OCCT is good too.

And should i set the AVX offset to 2.

Most people set it to 1 or 2 (negative). Use any you like or adjust while stability testing. AVX can spike the temps to 80+ or 90+ under high voltage. So people lower it.

Karadjgne · Aug 23, 2018

Pretty much games do not use AVX, AVX2 or AVX-512 instructions or a few others that are basically specialized for professional type applications like Blender etc. This means for temp testing of the cpu, the best program to use is Prime95 version 26.6 small fft as it will give a continuous 100% cpu load, unlike OCCT and Aida64 which use linpack (variable ram usage) which will bounce the cpu from @80% to 100%, which changes temps. For aircoolers you'll only need @15mins small fft torture test, for AIO's/liquid cooling a minimum of @½ hour torture test to allow for coolant to acclimate.

Temps are not stability. For OC stability use Asus RealBench, run it for several hours. It'll use all the cpu instructions, including AVX/2 in Blender to really put the pc through a strenuous "think" workout. If the pc will pass several hours there, it'll pass any game.

AVX offset is just a precaution should any program actually use AVX, to regulate temps it'll knock your OC down whatever the set amount is, and a corresponding lowering of vcore.

salm2s · Aug 23, 2018

Karadjgne :

OK, so i did an CPU: OCCT test with an offset of 2 and it passes! But does that still mean that OC is stable, even if it does go down to 4.3 Ghz. And i will do a Asus Real bench soon.

Thanks,
salm2s

salm2s · Aug 23, 2018

zebarjadi.raouf :

Well, i have my voltage set to 1.270v. It keeps stable, no BSOD’s and passes IBT (20 passes), Cinabench and AIDA 64 for 1hr, and this was without offset. However, OCCT does not seem stable as after a few seconds, it fails. I tries running it with AVX offset 1, same thing. But with AVX offset 2, it seems to work. But does that mean my OC is stable, even if it goes down to 4.3 Ghz

zebarjadi.raouf · Aug 23, 2018

However, OCCT does not seem stable as after a few seconds, it fails. I tries running it with AVX offset 1, same thing. But with AVX offset 2, it seems to work.

If it failed, it means it couldn't handle the higher load AVX put on it. I would increase the voltage to 1.275v and keep the AVX offest at 2. Also, it only goes down to 4.3GHz when AVX is used and games don't use it.

Also, did you manually set LLC? It can help OC by preventing voltage drop. Level 4 or higher (50%) is recommended.

Test for a few days with software and games. If nothing happens, then it's stable.

salm2s · Aug 23, 2018

zebarjadi.raouf :

I have my LLC at Level 2. My Mobo only allows up to LLC level 4. And i have done many game benchmark with no failure. I will try 1.275 with LLC level 4 and see if that keeps stable.

zebarjadi.raouf · Aug 23, 2018

I guess yours has 4 levels with each being 25%. 1.275v with level 3 should get the job done. You just have to keep testing and optimizing till no errors pop up.

I used AIDA64 + Prime95 each for 12hours, crashed while shutting down. That's why I recommend being absolutely sure. Crashing while gaming or working sucks.

salm2s · Aug 23, 2018

zebarjadi.raouf :

So I guess i cant get away without having AVX offset. But I’ve seen so many other people having the same clock, but with no AVX offset. Did i just get bad luck in the silicon lottery?

zebarjadi.raouf · Aug 23, 2018

i cant get away without having AVX offset.

You can get away with it by increasing voltage and LLC. OC as much as you want, just make it's stable and cooler than 80c for daily usage. Just don't use more than 1.40v Vcore.

Did i just get bad luck in the silicon lottery?.

You would have to be very unlucky to get a bad chip. I have seen people use 1.36-1.38v for 4.6Ghz. Yours should be quiet better.

Here if you wanna have a rough idea about your max OC potential:
https://en.wikichip.org/wiki/intel/core_i5/i5-8600k#Overclockability

Karadjgne · Aug 23, 2018

If all your pc is used for is games there's no need for any AVX offset at all. Also the offset has reported issues, it not only drops the cpu speed, but also vcore voltages and this can and will cause instability in some systems, especially if vcore is barely into stable voltages.

If all you do is game and websurf etc, AVX is no worries, you'll never have need of it, so use of a torture test program that does use AVX and drives temps well beyond anything you'd normally see is nuts.

Prime95 v26.6 small fft = cpu max temps under normal situations.

Asus RealBench = cpu stability.

Prime95 usage does not mean stability testing, RealBench or other programs does not imply good thermal testing.

salm2s · Aug 23, 2018

Karadjgne :

Ok. I will report both Prime 5 26.6 and Asus Realbench, both with and without AVX offset. Thanks, salm2s

salm2s · Aug 23, 2018

zebarjadi.raouf :

Ok, i will keep 1.275, and will try different LLC’s

salm2s · Aug 24, 2018

Another thing i noticed is that when there is no OC, and i did the OCCT test, the clock automatically when down when the AVX ratio offset was set to auto. But when i turn on OC, it never goes down. Why is that?

zebarjadi.raouf · Aug 24, 2018

Another thing i noticed is that when there is no OC, and i did the OCCT test, the clock automatically when down when the AVX ratio offset was set to auto

Some MB manufacturers (ASRock in your case) lower AVX automatically to prevent overheat or stability issues on consumer CPUs because it's not normally used unless you're into content creation like rendering.

But when i turn on OC, it never goes down. Why is that?

When you OC, the BIOS starts using different instructions for AUTO. That's why it's recommended to manually enter them. Because AUTO can bounce off between different options sometimes.

salm2s · Aug 24, 2018

zebarjadi.raouf :

OK, so i did what u said, kept offset 2 with LLC level three, and it seems to work just fine. No BSOD’s, all games are functional. However, i did notice that for some reason, when i played games (like fortnite), the clock would bounce back between 4.5 Ghz and 4.3 Ghz. Are games starting to use AVX code now????!!!!

zebarjadi.raouf · Aug 24, 2018

Are games starting to use AVX code now????!!!!

Haha, nice joke. Wait, what? :ouch:

However, i did notice that for some reason, when i played games (like fortnite), the clock would bounce back between 4.5 Ghz and 4.3 Ghz

It's probably the CPU changing clocks to whatever it needs. AVX these days is mostly used for professional and OC stuff. And the only games that I know use it are console emulators.

fortnite @4.5 Ghz

What FPS are you running at? 150+?
Just because it's running 4.5GHz (or 4.3GHz) doesn't mean it's using CPU's max potential. Doubt you would need to overclock for fortnite.

salm2s · Aug 24, 2018

zebarjadi.raouf :

My gpu is a EVGA gtx 1060 SC, and normally i get around 120-144 FPS. In busy areas i get around 100 fps. I checked the cpu usage in the game and it didnt really go above 90%. It sat around high 50% to low 80%.

Here’s a reference to someone else having the same issue. Plus its newer cpu aswell: https://linustechtips.com/main/topic/907503-8700k-dropping-to-avx-offset-speed-during-gaming/

zebarjadi.raouf · Aug 24, 2018

EVGA gtx 1060 SC

Next time you upgrade, go all out on GPU. It's probably bottlenecking the CPU when gaming.

I checked the cpu usage in the game and it didnt really go above 90%. It sat around high 50% to low 80%.

If You're not hitting 100%, then don't worry too much about it dropping a little.

Here’s a reference to someone else having the same issue. Plus its newer cpu aswell:

Maybe the developers are finally updating their code. Nice to know.

If the AVX hits you with OCD, you can just disable the offset, increase the voltage a little and play for few days for stablitity instead of OCCT.
You could also consider getting it delidded + liquid metal. Enables higher OC for lower voltage.

salm2s · Aug 24, 2018

zebarjadi.raouf :

Games work perfectly fine without any offset. Rite now i am doing some OCCT testing with the offset. So far it has passed 1 hr of small data set and medium data set

*UPDATE* Ok, so unfortunately, the large data set fails in 2 minutes. But i ain’t giving up. Rite now doing a Asus Realbench stress test for 1hr. So far it hasn’t failed :|

salm2s · Aug 25, 2018

*UPDATE*
Ok, so i did the Realbench for an hour and got no errors. I am now going to do IBT with 20 passes and do an AIDA 64 test for 1hr aswell. It seems as though that the only software failing is OCCT ??

zebarjadi.raouf · Aug 25, 2018

It seems as though that the only software failing is OCCT ??

I guess OCCT is being picky. I heard OCCT solves complex mathematical problems and whenever the answer is different from whatever stored inside, it gives an error.

If you're happy with your OC, leave it be. I have an OCD about tests being perfect so I always use more voltage than necessary to keep it stable under all conditions.

salm2s · Aug 25, 2018

zebarjadi.raouf :

Ye i guess ur rite. If im just going to be playing games, i dont think AVX is really necessary, is it?

AVX ratio offset OC

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