advice for my gpu overclock please.

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fernydr92

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I've overclocked my evga gtx 1070 sc to 2100mhz and memory clock offset of +500. didn't touch voltage. the problem is that when i bench mark using heaven or valley the app begins to skip a little then it crashes. not my system the app. i tried overwatch and the game begins to skip also. anything i can do to fix this. add voltage? any advice will be appriciated.
 
Solution
TehPenguin
My advice from dozens of cards overclocked is that sometimes reducing voltage increases the stability while increasing it destabilizes the core. Best thing is to get used to working with the Voltage/Clock Curve. Set your max boost at 1093mV, test, reduce by one notch, test, reduce by one notch, test...

Regarding memory: ~+500 seems what all nVidia cards I had in my hands so far can handle. There are ways to tweak it to maximise the OC but it's very labor heavy and only worth it if you are having fun doing it because the actual benefits are almost not measurable.

Regarding temperature: Pascal seems to have 3 throttling thresholds. 1st at ~45C, 2nd at ~61C and the 3rd at ~82C (2C give or take).
What does it mean? You should not notice...
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Vellinious

Vellinious

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Add a little voltage and increase fan speeds. The cooler you keep Pascal, the higher you'll get it to clock, and the better it'll run.
 
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TehPenguin

TehPenguin

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My advice from dozens of cards overclocked is that sometimes reducing voltage increases the stability while increasing it destabilizes the core. Best thing is to get used to working with the Voltage/Clock Curve. Set your max boost at 1093mV, test, reduce by one notch, test, reduce by one notch, test...

Regarding memory: ~+500 seems what all nVidia cards I had in my hands so far can handle. There are ways to tweak it to maximise the OC but it's very labor heavy and only worth it if you are having fun doing it because the actual benefits are almost not measurable.

Regarding temperature: Pascal seems to have 3 throttling thresholds. 1st at ~45C, 2nd at ~61C and the 3rd at ~82C (2C give or take).
What does it mean? You should not notice any clock fluctuations(given the voltage is constant) in between. So do not adjust your fan curve to get down from 70C to 64C because the noise output will be far greater but the actual average clock value will barely change.

Again: talking from experience, I've overclocked 10 or so Pascal cards, it's not official data.
 
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Solution
Vellinious

Vellinious

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The reason higher voltages create instability, is because it creates more heat. Pascal likes to run cool.....

Boost 3.0 will adjust clock and frequency at all operating temps. The temps they adjust at are also slightly different for each GPU.
 
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TehPenguin

TehPenguin

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Not necessarily, but yes, that also is a reason. I've overclocked watercooled cards where the voltage had little to no impact on the temperature (massive overkill watercooling) and different voltages yielded different stability. In this particular instance I remember struggling to get to 2.1GHz stable at 1043mV or above but reducing it to 1031mV showed to be the sweetspot with 1025mV being unstable again.
 
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Vellinious

Vellinious

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Temps matter all the way along the temp spectrum. All the way down to -7c...the lowest temp I tested. Yes....it does matter all the time.

The voltage being too high CAN cause problems without temps being the issue, yes.
 
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TehPenguin

TehPenguin

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Uh... what? Nobody talked about that, or am I missing something ^^
 
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Vellinious

Vellinious

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Apparently.

Overclocking pascal is all about core temps. Keeping the core cool should be first and foremost on everyone's mind. Adding voltage on air can help, a little bit, as long as they're running a custom fan curve to account for the increased voltage.

I reiterate the "temp" thing as much as possible, because it is the single most important thing when overclocking this new architecture....and will probably become even more prevalent as die shrinks continue.

The reason I mentioned the temp testing I have done, is because you talked about the "throttling thresholds" and where they're at. I interceded there, because the "throttling thresholds" don't go away below certain temps. Boost 3.0 constantly makes adjustments.
 
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TehPenguin

TehPenguin

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I feel like youre overthinking this a bit. Yes, Pascal does run better the cooler it is but there is a point of diminishing returns. That's what I meant with my "thresholds". These are rough windows of when getting the core much cooler costs you a lot of noise but yields little performance.
 
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Vellinious

Vellinious

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And I was just correcting your errors. Those points are different for every GPU.

Personally, I wouldn't even bother overclocking a pascal GPU unless it was under water.
 
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