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Power target throttles itself downward at times with evga 670 ftw but only certain programs.

post #1 of 15
Thread Starter 
Got a really, really weird one here.

I set up for a run in Heaven trying to find maximum oc using Precision X.

Set gpu for 1335mhz and memory for 7200mhz. Set power target to 145% and run Heaven @ 1080p settings maxed. Heat never gets higher than 60-62c at any time.

I generally get 53-54fps with actual power usage fluctuating anywhere from 105% to 125%.

If I keep Heaven running, I will eventually see frame rate drop down to about 1/2 and power usage drops to 85-90%. I will normally get 2 or 3 runs in before this occurs.

Yet, Precision reports the card still running at 1335mhz and 7200mhz and using 1.175v which simply cannot be right.

Exit Heaven, fire up skyrim and poof, power usage drop and framerate drop is present there too. 3dmark11 also has it.

Here is the kicker. Fire up evga oc scanner and run a stress test and the card will once again use 120-130% power target.

Shut down oc scanner, fire up any one of the other three and power usage will once again drop to 85-90%

I've tried every 600 series driver and it still happens. I tried msi afterburner instead of precision x and it does the same thing (which I expected)

I did a fresh install of windows yesterday. No change.

Evga support is trying to help. But now they are saying that my ax-750 psu may be the cause as the 12v rail will drop from 12.28v to 12.19v under load from the card. Everything I've read about psu 12v fluctuation says that's a tiny, tiny drop and well within spec. And saying the psu could cause the issue makes no sense when I can open oc scanner and it will bring the card back up to 125%.

I'm open to ideas.
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post #2 of 15
Does this happen at default clocks also? If you load defaults on Precision after this occurs, then reload app, will performance go back up?
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post #3 of 15
Thread Starter 
Quote:
Originally Posted by EVGA-JacobF View Post

Does this happen at default clocks also? If you load defaults on Precision after this occurs, then reload app, will performance go back up?

No, it does not happen at default clocks.

I've tried setting precision back to defaults and reloading but once it occurs, it seems to stick until a reboot.
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post #4 of 15
I've actually had the exact same problem with my 570 since the May WHQL's, where it will downclock randomly during intensive tasks, and the only way to reset clocks is with a reboot. Sometimes I'm fine for a week and the next week I have the problem several times a night. At stock clocks it's fine.

It might be a case of the overclock being too aggressive, but I'm not quite sure. I'd try tuning back the core clock a bit and see what happens.
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post #5 of 15
Thread Starter 
Quote:
Originally Posted by Talon95 View Post

I've actually had the exact same problem with my 570 since the May WHQL's, where it will downclock randomly during intensive tasks, and the only way to reset clocks is with a reboot. Sometimes I'm fine for a week and the next week I have the problem several times a night. At stock clocks it's fine.
It might be a case of the overclock being too aggressive, but I'm not quite sure. I'd try tuning back the core clock a bit and see what happens.

If you're talking about your gpu downclocking it's frequency then no, we're not experiencing the same thing. My gpu and memory clock stay exactly as set. It's my power target % that I see dropping.
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post #6 of 15
Ohhhh okay.. That's weird.

I'm not too familiar with Kepler Overclocking, but could the power target resetting be a result of overclocking too aggressively?

If it doesn't happen at stock it makes me curious as to why it's doing so at overclocked speeds.
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post #7 of 15
Do you have your GPU set to MAX performance in your Nvidia settings as well as the computer itself...make sure your power management is legit. In fact make it so legit that It will never quit. smile.gif
    
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post #8 of 15
Thread Starter 
Quote:
Originally Posted by Talon95 View Post

Ohhhh okay.. That's weird.
I'm not too familiar with Kepler Overclocking, but could the power target resetting be a result of overclocking too aggressively?
If it doesn't happen at stock it makes me curious as to why it's doing so at overclocked speeds.

That's actually what I was wondering myself. If I set the gpu to 1335mhz and leave memory alone, I only hit slightly over 100% on power target. It's when I set memory to fairly high that power usage will hit 120% or slightly higher.

It's almost like I have a memory failure without a crash.
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post #9 of 15
Try running the card at stock for a while, see if the problem goes away. If it does, then you know what the cause was. Kepler cards can appear to be stable at certain OC's for fairly long periods of time before they suddenly randomly crash due to instability.

So, I think what you're seeing is some type of problem created by your OC. A 'partial' crash, if you will.

And you're right, it's definitely not the PSU.
    
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post #10 of 15
Quote:
Originally Posted by mcg75 View Post

That's actually what I was wondering myself. If I set the gpu to 1335mhz and leave memory alone, I only hit slightly over 100% on power target. It's when I set memory to fairly high that power usage will hit 120% or slightly higher.
It's almost like I have a memory failure without a crash.

That's what I was thinking... You don't see any kinds of artifacts? Overclock seem to be above average... is it a modded BIOS?
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