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Discussion Starter · #1 ·
I managed to get my 270X stable at 1200MHz and 1.210V, which I'm very pleased with, it now survives Unigine Valley and Furmark, however it will occasionally drop to 1142MHz for a second or two then go back up to 1200. Is that a sign I should further increase the voltage or perhaps lower the core clock, or is there a way to fix that? I'm using Sapphire Trixx.
 

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Is the GPU usage also fluctuating at the same time?

It may be speedstepping the overclock down when it isn't needed.

What is your power control % set to? Normally when overclocking, it should be maxed out at 20%, which provides more stability.

If this helped please press the rep button!
 

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Discussion Starter · #3 ·
It seems to vary regardless of load, I can reproduce it, but I can't determine what is causing it. It happens at all clock speeds above stock. 1150MHz will drop to 1094.4MHz, at 1140MHz it will drop to 1082MHz, at 1200MHz it will drop to 1142MHz, etc.

Lost Planet 2's DX11 benchmark stays constant.
Unigine Heaven has many drops.
Unigine Valley has a small number of drops.
Crysis 2 has infrequent drops.
Battlefield 3 stays constant.
Titanfall stays constant.
Furmark constantly drops and rarely stays at the custom clock speed.

My VDDC is at 1.210V, I also tried it at 1.225V with no effect, should I increase it further? I'm not sure what the safe limit for a 270X is. I'm using Sapphire Trixx but I could just as easily use Catalyst if you think that's better for the voltage regulation.
 

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Discussion Starter · #5 ·
The core temperature is very modest, it never passes 51°C, and a 0.010V increase should not be enough to overheat the VRM.
 

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some games and benchmarks have cut scenes that does not require a full load, so that could be causing the fluctuations. i know Valley, Heaven, and all 3DMarks do.
 

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Discussion Starter · #8 ·
Quote:
Originally Posted by Bagmup View Post

Unigine valley makes my msi 270x fluctuate also.
Is it in specific scenes? It usually happens to me around scene 16 in Valley, however it doesn't correlate with GPU load.
 

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Discussion Starter · #9 ·
Getting drops in Crysis 3 as well, again independant of GPU load. Opinions? Should I try increasing the voltage beyond 1.220?
 

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Quote:
Originally Posted by Masters View Post

Is the GPU usage also fluctuating at the same time?

It may be speedstepping the overclock down when it isn't needed....
i think its that, i didnt see you mention anywhere that you have bumped your power target/control % it worked for me when i couldnt keep one of my cards fully clocked even on idle
 

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Discussion Starter · #11 ·
Quote:
Originally Posted by dovaboy View Post

i think its that, i didnt see you mention anywhere that you have bumped your power target/control % it worked for me when i couldnt keep one of my cards fully clocked even on idle
.

I'd like to try bumping the voltage, but I'm not sure what a safe range is for a 270X.
 

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Discussion Starter · #13 ·
Quote:
Originally Posted by Masters View Post

Well since you're not overclocking try this:

Increase the power control % to max. Then increase the voltage by say...20mv. It's a small increase and won't effect it much but it might make it more stable.
Is the power control % separate from the voltage? Excuse my ignorance this is my first R9200 card, I just upgraded from a 5850.
I assumed the power control in Catalyst was the voltage, I've been using Sapphire Trixx which only has VDDC control.

In what way is the power control different from the voltage control? Should I have been raising both values?
 

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It's related but not directly.

With AMD cards you can adjust the power control and the voltage. The power control allows the card to draw more power from the PSU than it normally could. Which makes it more stable in high end games.

So really it should always be maxed. There is a registry hack that actually allowed you to set this as high at 50%. But it is rarely needed (even though I use it).

If I understand it right, when a game tries to draw more power and the power control isnt maxed, it will throttle down because it's maxing out, then resume normally until it maxes out again. By increasing the amount of power it can draw, that max will be 20% higher.
 

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Discussion Starter · #15 ·
Quote:
Originally Posted by Masters View Post

It's related but not directly.

With AMD cards you can adjust the power control and the voltage. The power control allows the card to draw more power from the PSU than it normally could. Which makes it more stable in high end games.

So really it should always be maxed. There is a registry hack that actually allowed you to set this as high at 50%. But it is rarely needed (even though I use it).

If I understand it right, when a game tries to draw more power and the power control isnt maxed, it will throttle down because it's maxing out, then resume normally until it maxes out again. By increasing the amount of power it can draw, that max will be 20% higher.
So I assume that's a power saving feature? Interesting, perhaps all of my problems are related to not raising that value, is it safe to just knock it up to 40%, or like the voltage control, can setting it too high cause damage?
 

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Quote:
Originally Posted by Dansrage View Post

So I assume that's a power saving feature? Interesting, perhaps all of my problems are related to not raising that value, is it safe to just knock it up to 40%, or like the voltage control, can setting it too high cause damage?
Nope, it won't cause any damage. Set it as high as you wish!
 

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Discussion Starter · #17 ·
Quote:
Originally Posted by sidewaykill View Post

Nope, it won't cause any damage. Set it as high as you wish!
Success! It's now completely stable, the power control was indeed what was causing the issue, so we can conclude that it was a power problem and that the card was throttling when too much power was being drawn from the PSU.
I switched to MSI Afterburner, for some reason Sapphire Trixx has no power control slider, and GPU-Z shows completely stable clock speeds.
Thanks guys.
 
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