CPU's clock speed unstable under heavy load(fx 8350)

devor110 · Mar 15, 2016

This thread is a followup to my previous one as that one has been accidentaly solved, but the theme is different so i decided to make a new one.

http://imgur.com/2qAFxyW This is the problem. This is what my CPU has been doing (going from nearly full load(4.0 ghz) to 1,32-1,36 at 32-34% usage) while running prime95 which should push it to a constant 100%. This is all i know and i'm asking for help if anyone has seen something like this or has any kind of idea on how to fix it.

burgessanthony · Mar 15, 2016

Use the small fft mode for stable 100%

HDD-Mod · Mar 15, 2016

VRM's are overheating on your motherboard

devor110 · Mar 15, 2016

HDD-Mod :

That is a good start but how do i fix that? overall case cooling?

HDD-Mod · Mar 15, 2016

Well, first off, what's your motherboard? Then I can give you your solution

thx1138v2 · Mar 15, 2016

Could be motherboard or cpu overheating causing throttling. It could actually be overheating or it could have incorrect sensor outputs that are making the firmware think it is overheating when it is not. Check the temperatures with an infrared non-contact thermometer. They can be had at Radio Shack or online pretty cheap.

A simple way to check if it is a heat problem is to pull the side cover off the case. If the situation improves you might also look at getting more air through the case to improve the cooling. This won't fix the problem but it's a good indicator of whether or not it is a heat issue.
http://www.overclock.net/t/1488441/fx-8350-throttling

devor110 · Mar 15, 2016

HDD-Mod :

I might as well post the whole rig so here we go

msi 970 gaming motherboard
r9 270x 2gb
fx 8350 @4.0ghz
16 gb ddr3 @ 1600mhz

HDD-Mod · Mar 15, 2016

Assuming this one - http://www.newegg.com/Product/Product.aspx?Item=N82E16813130790&cm_re=MSI_970_gaming-_-13-130-790-_-Product

What's your case? Yes, airflow is the issue here if that's your motherboard since it has good heatsinks on the motherboard, so you aren't getting enough air over em.

Also try small fft's, see if that helps.

devor110 · Mar 15, 2016

thx1138v2 :

So what you are telling me is to not believe what software says about my temps?

devor110 · Mar 15, 2016

i am extremely confused now. took of the side panel as suggested and both clokc speed and usage is fairly stable at 3,76ghz and 95% usage. I just don't understand, like really is that all?

edit Just as i hit the "post answer" and checked task manager it dropped agai. fck!

HDD-Mod · Mar 15, 2016

Throttling if it's overheating.

Get speccy and check - http://www.piriform.com/speccy/download/standard.

Taking the side panel is a good way to test, if it's overheating. Disable ll the power saving stuff in the BIOS as well

barto · Mar 15, 2016

What case do you have? Do you have proper air flow? It's a little better at solving the problem.

devor110 · Mar 16, 2016

HDD-Mod :

I was running small for BTW my case is a big grey metal box no brand no name I was planning to swap it at the same time I'd upgrade to gtx 970

madmatt30 · Mar 16, 2016

Run amd overdrive s CPU status tab while running prim, like to see ypurcthermal margins while under load.

The 970 gaming has a solid vrm setup so massively unlikely its board throttling.

More likely a cooling issue , are you running the stock cooler ??

devor110 · Mar 16, 2016

madmatt30 :

Recently upgraded to hyper 212 Evo, and I am getting these issues since the change

madmatt30 · Mar 16, 2016

Then let us know thermal margin in overdrive - all info points to a bad cooler install or bad application of paste.

devor110 · Mar 16, 2016

madmatt30 :

http://imgur.com/c2dD9Zu http://imgur.com/u6vgcKm this is how it's installed (was not done by me).
By thermal margins do you mean what temps my pc usually gets? It's around 40-50C across all pieces idle, and around 60-65C under load

madmatt30 · Mar 16, 2016

Way way way too much thermal paste on there mate !!
Who installed it?? The evo comes with a pipette syringe with enough paste for half a dozen installs
at least.
It looks like they used the lot in one go.

Too much is as bad or worse than not enough.
Amd overdrive shows a thermal margin which works backwards from the max chip temp.

Idle you should be looking at 40-50c
Under prime between 18-25c .

devor110 · Mar 16, 2016

madmatt30 :

It was actually an IT technician, professional..... I can'd do the AMD overdrive stuff as i am not at my PC

Ecky · Mar 16, 2016

There's too much thermal paste, yes, but I doubt that's your issue.

The Hyper 212 is a tower cooler, and its fan no longer blows down onto the motherboard, cooling the components around the CPU (namely the VRMs). Your motherboard is likely overheating, causing the CPU to throttle. You can fix this by rigging some fans up to blow on the motherboard... or, you can leave it alone, because in real-world loads, you're not going to draw as much power, and it's probably not going to throttle.

devor110 · Mar 16, 2016

Ecky :

The problem is, that i do . I did not notice this issue because i like running prime95 all the time, but actually while playing planetside 2, and these clock speed instabilities happened there first causing fps drops to 10 at times.
So in conclusion if i get my motherboard's temps down that should fix my problem? Even if it does my current PC case only has 2 cooler slots and they are small, so i might just want to get a new case, which was planned but onyl with my GPU upgrade. But i think getting the motherboard temps down will probably help since when I tried running prime with both my case's side panel on and off it was stable for a while with it the panel off.

madmatt30 · Mar 16, 2016

Ecky - going to have to disagree 110% here - you're underestimating the 970 gaming board.
Its vrm setup is rock solid , I've seen people run 9370's on that board without issue.
Its fine with a stock 8350 & can manage it easily with no vrm cooling.

The cooler installation is the issue imo , whoever dropped that much paste on there is definitely no professional.
The sink needs unscrewing , the paste needs scraping (its dangerously close to running off the edges of the chips PCB edge where you shouldn't even see any) & reapplying at a bare minimum.
I wouldn't trust that the backplate & spring loaded screws are properly fitter either personally - it honestly looks like a first time builders fitted it.

I've fitted close to 20 evo's & they still sometimes give me problem's getting the spring tension right.

Ecky · Mar 16, 2016

You have a few options:

-You could downclock or undervolt your CPU slightly
-You could leave the side off of your case, and possibly put a large house-fan blowing in the side
-You could cut a hole in your side panel and install a new fan there
-You could replace the case

It's probably not cost effective, but Intel CPUs don't have the same heat problems and are considerably faster in that game:

^ This is an old chart that doesn't include modern chips, but a modern Intel dual core is likely in the range of 50% faster (or more) than an FX-8 core in this particular game.

Ecky · Mar 16, 2016

madmatt30 :

I'll concede, it's very possible you're right. Too much paste rarely causes catastrophic temps, but there's definitely too much on there. Someone who doesn't know how much paste to use might not know how to properly mount the cooler, either.

devor110 · Mar 16, 2016

madmatt30 :

Ecky :

Well you'd be surprised but based on testing ( having the panel on and off) it probably is the motherboard overheating, somehow. When i had the side panel off it took a good while for prime95 to get to a stage where the clock speed would go random but when put back to place it happened almost immdeiately so getting a new case is probably the thing i am going to do. I won't pick a solution and close this just yet since the new case with more fans may not solve the issue.

CPU's clock speed unstable under heavy load(fx 8350)

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