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~~The GTX 670 Overclocking Master-Guide~~ - Page 47

post #461 of 3357
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Quote:
Originally Posted by Arizonian View Post

See for me with max Power Target I'd get GPU #1 1189 GPU #2 1214 but instability would occur when maxed for a length of time. Lowered PT down and now stable @ GPU #1 1175 & GPU 1201. When I did back down Core and kept PT maxed I only found it to decreased my Heaven & 3DMark11 bench scores. So it actually didn't improve performance to keep PT maxed with lower Core clock.

I'm really curious why your scores actually improved by reducing the power target. At least on paper, it shouldn't increase performance by reducing it. The only way i can see how reducing the power target would improve performance is if you're flirting with the 70C throttle-threshold and the PT reduction would then keep you under 70C. For example, if you're at 1175MHz with the PT maxed out and your GPU is hitting 71C during the benchmark because of the slightly increased power draw (and then being throttled down to 1162), then by reducing the PT a bit, you might be able to keep the GPU under 70C at all times and not get throttled (so you'll run at 1175MHz the entire bench run). Just for the sake of my own understanding, do you mind doing two heaven bench runs (one with PT maxed, one with your current PT) and then post the graphs so i can see temperature, power percent, and core clock, as well as what you scored in Heaven for each run?
Edited by SeanPoe - 7/18/12 at 11:56pm
post #462 of 3357
Quote:
Originally Posted by SeanPoe View Post

I'm really curious why your scores actually improved by reducing the power target. At least on paper, it shouldn't increase performance by reducing it. The only way i can see how reducing the power target would improve performance is if you're flirting with the 70C throttle-threshold and the PT reduction would then keep you under 70C. For example, if you're at 1175MHz with the PT maxed out and your GPU is hitting 71C during the benchmark because of the slightly increased power draw (and then being throttled down to 1162), then by reducing the PT a bit, you might be able to keep the GPU under 70C at all times and not get throttled (so you'll run at 1175MHz the entire bench run). Just for the sake of my own understanding, do you mind doing two heaven bench runs (one with PT maxed, one with your current PT) and then post the graphs so i can see temperature, power percent, and core clock, as well as what you scored in Heaven for each run?

Keep in mind the scores showing are not my top score as my system isn't optimized for benching ATM. I scored 110 FPS top score.

Well learned two things - I'm not at that happy temperature place after all because secondly, GPU-Z dosen't take accurate temps I'm finding. I ran it along side of Precision and got two different results. Hence why I was under the assumption according to GPU-Z my temps were well below 70C as you can see from the screen shots. Here are my results with Power Target as you wanted for confirmation in relation to scoring.


+125 PT / +132 Core / +183 Memory = KB 1177 & 1202 MHz Core = Heaven 103.5 = Precision 75C & 74C GPU-Z 58C & 59C
Warning: Spoiler! (Click to show)



+135 PT / +129 Core / +183 Memory = KB 1175 & 1201 MHz Core = Heaven 105.6 = 75C & 74 C
Warning: Spoiler! (Click to show)



+125 PT / +129 Core / +183 Memory = KB 1175 & 1201 MHz Core = Heaven 106.0 = 75C & 74C
Warning: Spoiler! (Click to show)


     
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post #463 of 3357
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Quote:
Originally Posted by Arizonian View Post

Keep in mind the scores showing are not my top score as my system isn't optimized for benching ATM. I scored 110 FPS top score.
Well learned two things - I'm not at that happy temperature place after all because secondly, GPU-Z dosen't take accurate temps I'm finding. I ran it along side of Precision and got two different results. Hence why I was under the assumption according to GPU-Z my temps were well below 70C as you can see from the screen shots. Here are my results with Power Target as you wanted for confirmation in relation to scoring.
First, I'd just like to thank you for providing this information. It will go a long way in helping our understanding of why some people might see a performance increase by reducing the power target.
Quote:
+125 PT / +132 Core / +183 Memory = KB 1177 & 1202 MHz Core = Heaven 103.5 = Precision 75C & 74C GPU-Z 58C & 59C Warning: Spoiler! (Click to show)

GPU1 is being throttled by what looks like 13MHz for the entire first half of the bench. It's interesting that you saw a 13MHz increase during the second half despite temperatures remaining well over 70C. This, combined with the fact that the power percent also dropped for the second half, leads me to believe the initial throttle was because of power and not temperature. Maybe GPU-Z is actually displaying a correct temperature after-all and its precision-X that's incorrect? The fact that GPU2 doesn't get throttled once the entire run despite going over, and remaining over, 70C the entire run definitely supports this theory.
Quote:
+135 PT / +129 Core / +183 Memory = KB 1175 & 1201 MHz Core = Heaven 105.6 = 75C & 74 C Warning: Spoiler! (Click to show)

Here GPU1 is being throttled by ~13MHz for the majority of the benchmark. I'm actually somewhat surprised this run produced a higher score than the first test despite running at, what appears to be, a lower average core clock. One thing that's interesting here is the core voltage dropped from 1.175v to 1.162v for the majority of the bench run. This didn't happen in either of the other tests. Do you have the voltage slider maxed out to 1.175v in precision-X? If not, it would be interesting to see this test re-run with the voltage slider maxed out.
Quote:
+125 PT / +129 Core / +183 Memory = KB 1175 & 1201 MHz Core = Heaven 106.0 = 75C & 74C Warning: Spoiler! (Click to show)

Here GPU1 isn't being throttled at all, so it's not surprising at all why this test produced the highest score. However, i still don't understand why reducing the power target actually removed, what appears to be, a power-related throttle in the +135PT test. Again, as observed in the first two bench runs but with GPU2, GPU1 isn't being throttled at all despite going over 70C. This either means precision-X is inaccurately reporting temperatures or your GPU throttles at a higher temperature than 70C. I've found that my Asus 670 doesn't throttle until 79C and then again a second time at 80C. This might be the case for your 690 too. Further tests would be needed to confirm either theory. Another interesting observation is that your power usage went up to 113% in this test (it was only 111% and 110% in the first two respectively) even though you reduced the power target.

If you'd like to run a test to find your exact thermal throttle point, i wrote a short guide on how to do that here. You can find my results from that test here and here, so as you can see, not all kepler's throttle at 70C.
Edited by SeanPoe - 7/19/12 at 10:13am
post #464 of 3357
Hmm working out a trade + cash on a Gtx 690... Im kinda scared of it as seeing how hard my 590s were to sell.. but.. they did do a great job on the 690 where the 590 had it's issues...
    
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post #465 of 3357
Hi guys, long time reader first time poster.
Im having a few problems overclocking my evga 670 FTW. I have been trying to do it as per instruction in your quick method, and this is the problem i am having.

With everything at default this is what im getting.
image.php?id=e6ime&f=1'
Click to view full size!


But as soon as i increase only the power target and voltage to max, I get this.

image.php?id=2thab&f=1'
Click to view full size!


Is there something i am doing wrong or have i missed something?
Any and all help will be much appreciated and keep up the good work.

Edit: More info and screenies in the next hour, as soon as i have finished dinner. It looks like volts are hurting my OC, but PT does help. I am very new to this.
Edited by Carcin0Genic - 7/20/12 at 2:41am
post #466 of 3357
Quote:
Originally Posted by Carcin0Genic View Post

Hi guys, long time reader first time poster.
Im having a few problems overclocking my evga 670 FTW. I have been trying to do it as per instruction in your quick method, and this is the problem i am having.
With everything at default this is what im getting.

But as soon as i increase only the power target and voltage to max, I get this.

Is there something i am doing wrong or have i missed something?
Any and all help will be much appreciated and keep up the good work.
Edit: More info and screenies in the next hour, as soon as i have finished dinner. It looks like volts are hurting my OC, but PT does help. I am very new to this.

There was no driver crash or anything? It kind of looks like your GPU's reverting to 2D clocks or something.
post #467 of 3357
Nope no driver crashes. Will edit this post in 10 minutes with more info.
Ok here we go

145%PT 1.175V +80CC Heaven= 789
image.php?id=whr08&f=1'
Click to view full size!

So here i have droped PT and V
130%PT 1.15V +80CC Heaven= 842
image.php?id=fsbkz&f=1'
Click to view full size!

And another V drop
130%PT 1.125V +80CC Heaven= 898
image.php?id=03x05&f=1'
Click to view full size!

And another V drop
130%PT 1.10V +80CC Heaven= 949
image.php?id=crra5&f=1'
Click to view full size!

Increase of PT
145%PT 1.10V +80CC Heaven= 951
image.php?id=0hkrq&f=1'
Click to view full size!

Another V drop
145%PT 1.075V +80CC Heaven= 1011
image.php?id=20mzf&f=1'
Click to view full size!

Another V drop
145%PT 1.05V +80CC Heaven= 1050
image.php?id=fxoup&f=1'
Click to view full size!

Again a V drop
145%PT 1.025V +80CC Heaven= 1075
image.php?id=ph748&f=1'
Click to view full size!


Thats basically where im at at the moment. So yeah to me it looks like Volts are definatly affecting my OC. Notice in the last 2 tests the score only increased my 25 points? Maybe im getting close and im starting to think you definatly need the right volts for the right OC, or at least in my case. This is the first time i have OCed a gpu, and OCed my first cpu just yesterday. So, What do ya think?
And my apologies about the wall of screenies.
Edited by Carcin0Genic - 7/20/12 at 4:30am
post #468 of 3357
Quote:
Originally Posted by Carcin0Genic View Post

Nope no driver crashes. Will edit this post in 10 minutes with more info.
Ok here we go
145%PT 1.175V +80CC Heaven= 789

So here i have droped PT and V
130%PT 1.15V +80CC Heaven= 842

And another V drop
130%PT 1.125V +80CC Heaven= 898

And another V drop
130%PT 1.10V +80CC Heaven= 949

Increase of PT
145%PT 1.10V +80CC Heaven= 951

Another V drop
145%PT 1.075V +80CC Heaven= 1011

Another V drop
145%PT 1.05V +80CC Heaven= 1050

Again a V drop
145%PT 1.025V +80CC Heaven= 1075

Thats basically where im at at the moment. So yeah to me it looks like Volts are definatly affecting my OC. Notice in the last 2 tests the score only increased my 25 points? Maybe im getting close and im starting to think you definatly need the right volts for the right OC, or at least in my case. This is the first time i have OCed a gpu, and OCed my first cpu just yesterday. So, What do ya think?
And my apologies about the wall of screenies.

Interesting. This isn't my first time overclocking, but I never thought extra voltage would hurt a GPU OC (asides from the usual problems of high temperature or too high of a voltage).

I guess you really do have to play around with the settings more, even fiddling around with stuff like lowering voltages just to make your GPU stable. I believe Arizonian (a couple posts back) had this same problem too. He posted in the same thread as this one.
post #469 of 3357
Yeah it does seem to be a very similar problem, and the way i read it is they believe its the PT whereas for me it is voltage.
I only just realised this isnt an Australian forum lol. Must be pretty early in the morning for you guys ay? Well if i just taught an experienced OCer something that would make me a happy man. Hopefully Arizonian and SeanPoe would have learnt from this too. Will update some more of what i have found when there is enough info. Just benchmarked at 1.00V and got 1110 in heaven. So will start increasing CC until i get a suitable clock then will start playing with voltages again. Lets wait and see.
Hopefully i will post up more tonight, (its 10pm here) but if not will definatly share more tomorrow night.

Ok something is really not right here. I had just posted all this following with pics only to realise after i restart my comp i forgot to set the PT at 145% so i went back and removed the pics from the host. Yeah stupid mistake i know. So the text is now edited to reflect this. And is definatly worth reading considering the TP was 45% lower than it should have been.

Here we have
100%PT 1.00V +80CC Heaven= 1110

So from there, i went to +95CC (driver crash) to +92CC (very bad/strange score 1st run, driver crash 2nd run) and ended up at
100%PT 1.00V +90CC Heaven= 1110. Same score as +80CC EXCEPT one of the lowest min fps, and the highest max fps, and the average was the same. I found that quite strange.

So, what happens now if we nudge the volts back to 1.025? This...
100%PT 1.025V +90CC Heaven= 1072 So we lost 28 points!

Ok ya wanna play that game huh, lets take it down to 0.975. Which happens to be the lowest she will go.
100%PT 0.975V +90CC Heaven= 1115. A 5 point jump from 1.00V

And this is where it gets really strange. After i realised my mistake i set everything back to what its was meant to be (145%TP 1.00V +90CC), and guess what? Driver crash. Ok i thought, resets computer, sets everything up again, driver crash again. Ok. What the frick is happening. The only thing i know right now is im tired as all hell and have to work in the morning. When i knock off from work tomorrow this will be my top priority. Expect to hear from me again soon!
Edited by Carcin0Genic - 7/20/12 at 7:00am
post #470 of 3357
Wait, so how many of you guys are getting better performance at below max power target or below max voltage?
Edited by bigal1542 - 7/20/12 at 9:41am
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