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~~The GTX 670 Overclocking Master-Guide~~ - Page 88

post #871 of 3357
Thank you for the response. What CPU are you running and at what speed? I am running an i7 950 running at 4.0 ghz. The reason I ask is because your heaven score is still slightly higher than mine when I am running at +115 core. Of course my kepler boost is only 38 given me a max boost of @1215 so maybe that is why.

I am happy with the card but I was hoping to break 1300 mhz just for bragging rights. With my load temps so low and TDP only running in the low 70% range I expected a much higher core overclock. I guess I shouldn't complain because some cards won't break 1200 and run much hotter than mine.

I think I am going to try running it at +100 on the core and +700 on the memory and play a few games. I am a little concerened running the memory so high for long term reliablility. Could running the memory overclocked so high cause reliablitiy issues down the road? Since we can't inrease the voltage I don't think overclocking has any negative effects as long as the temps are safe and it is stable. Does that sound about right?
post #872 of 3357
Thanks for the guide, you really helped me with my first OC, here is the result:

Gigabyte N670-OC-2GD (Windforce)
Stock/Boost 980/1058
Kepler Boost +92(Stock clock Max 1150)
Voltage =1.175 Power Limit 112%(Max)
Core offset +94 (Instant crash +116, Artifact 95-115), Max Boost OC 1241
Memory offset +600 (+700 drops TDP% to 70% max and Heaven FPS to <30)

Combined Max without crash: + 94, +600 (stopped after 1 artifact)
+93, +595 (passed with artifact)
tested all the way down to +93, + 430 -> crashed, everything above it had artifacts but no crash

+90, +400 passed without crash.




Max stable Heaven:50 FPS, 1259, 85% TDP & 66C @ 50% fan


3D mark 11 9665 (Max stock 9113)

Edited by sherlock - 9/27/12 at 9:04pm
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post #873 of 3357
I have a strange behaviour on my card i want to share it here so i can see if anybody else is having this issue also.

I can bench and pass heaven with the memory clock @ 3756 but i need to turn it all the way down to 3694 to pass 3dmark 11 -60mhz . I don't know but it seems to me weird that i need to turn down the clock all the way down to pass 3d mark .

Any comments on this ????

BTW i did this test without touching the core clock so i can narrow it down to the memory.
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post #874 of 3357
Quote:
Originally Posted by shremi View Post

I have a strange behaviour on my card i want to share it here so i can see if anybody else is having this issue also.
I can bench and pass heaven with the memory clock @ 3756 but i need to turn it all the way down to 3694 to pass 3dmark 11 -60mhz . I don't know but it seems to me weird that i need to turn down the clock all the way down to pass 3d mark .
Any comments on this ????
BTW i did this test without touching the core clock so i can narrow it down to the memory.

I think this is power celing limited, my +90/+400 OC ( 1240 max boost/ 1702.5 Max memory) Gigabyte 670 register a 85% TDP on Heaven3.0 but on 3D Mark it shows 96.5% TDP, so you probably bumped against the 100% TDP wall with that 3756(+751).
Edited by sherlock - 9/28/12 at 12:59pm
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post #875 of 3357
Hi Beekermartin, I have an i7 930 that I have overclocked to 4.0ghz. That bastard is D0 but needs me to pumpe 1.365 volts to it otherwise prime 95 crashes lol. I have a noctua NH-D14 massive heat sink so its all good, load temps are like 60 degrees even with that voltage. I also have 6gb of ddr3 corsair XM3 rame (1600 OC to 1691mhz). From my experience as long as your tempts are within the cards limits I dont think anything will fry long term, I backed down my memory a bit to +650mhz on the gpu because Borderlands 2 crashed randomly after like 2 hrs when I was at +700. Have you tried using afterburner 2.2.3? Like I mentioned in my first post, I am running the older 301.42 drivers as the latest (3.06.whatever it is) broke my overclock to max out at 1250mhz (including boost). All to say that the 670 is rated for a boost of 985 mhz so I suppose we should not complain about 1200mhz+. One interesting note is that last night I was benching at stock voltage on everything, memory+650mhz and power limit +114% and my card boosts to 1201mhz. Seems to crash when I dont add the extra voltage. I am still trying to figure out if the POWER EDITION actually does anything...but since it crashes without the extra voltage I guess it does? The one thing is when I monitor the voltage it always maxes at 1.175 and the +100mV seems to do nothing. But it crashes if I dont. Interesting stuff.
post #876 of 3357
It took some high voltage to get my i7 950 stable at 4.0. I am currently running at 1.38750 in the bios without vdroop. I was stable at 4.2 but it took over 1.4 volts to get there so I settled on 4.0 for 24/7 use. I have speed step enabled so unless I am gaming the volts drop down to @1.0 volts which helps keep idle temps low and probably helps with the lifespan of the chip. I am using a Corsair H60 with 2 fans and it keeps temps very low. Well, low for an i7 950 running at 4.0 that is. biggrin.gif

I just ran a few runs of 3d mark with the core at +104 and memory at +700. At that core offset I get a boost clock of 1201.50 according to gpu z. I was stable at +110 core offset but I hit the same boost clock so I dropped it down to 104 because it hits the same clock as 110.

I scored 9401 in 3dmark. I am using the free version so I can't change anything. The highest I've hit in Heaven is 49.7 fps and a score of 1252.

I did see a big jump in max tdp running 3dmark. It hit a high of 91%! Heavan only hit 76%. I am still way under the 112% that precision is set to. My temps are still incredible. Max temp while running 3dmark was 50C! I am using the custom fan profile explained in the guide. It is a little loud under load but not bad at all. I turn my case fans up to max when gaming so the card fans aren't much louder. I can hear them over my case fans but I can tolerate it. Since my temps are so low I think I will play around with the fan profile a bit. As long as the temps don't hit near 70c I should be fine. I will try to create a profile that keeps them at @60c but is a bit quieter.

I guess I am done overclocking this card for now. I wish I would have hit a higher core clock but thats the chip lottery. I hit a very high memory overclock and my temps are excellent so I am overall happy. Now its time to start playing Borderlands 2!
post #877 of 3357
I started testing some different fan profiles and I noticed a few artifacts while running Heaven. Only once or twice for a second but I know it wasn't right. I dropped down the memory to 650 and it crashed while running Heaven. That may have been a fluke but I dropped the memory down to 600 and I didn't see any artifacts. My Heaven FPS dropped to 49.3 compared to 49.7 at 700 mhz. I don't think that is a big deal. biggrin.gif
post #878 of 3357
Yeah, please note that if the artifact was around the dragon in the heaven benchmark I would ignore it. I get it on every run on every clock setting, on other forums I read most people claim its a flaw in Heaven itself (correct me if this is wrong). However if you are getting artifacts elsewhere I think you made the right call in backing down the memory. Enjoy borderlands 2 dude, I have been playing it with a friend and have been having a blast, including high PHYSX. I think I could optimize my OC on my i7 930 but I am so damn lazy now. I did a quick and dirty OC for a friend of mine with the same cpu and his runs at 1.325volts. Who knows maybe he has a golden chip that might run below 1.3 volts @ 4ghz (HT on of course, no cheating tongue.gif). To give you an idea my 670 runs and hits mid 60's @ 1350mhz with 600mhz ram. That is with a fan speed set to about 50%. In general its not that loud, I find I cannot hear it until about ~40% speed.
post #879 of 3357
Thanks for your help Immense Brick. I just played an hour or so of Borderlands 2. I had physx set to low but I am going to try turning it up next time I play. I have adaptive v sync enabled and I didn't see the frame rate drop below 60 at all. I imagine turning physx to high might change that.
post #880 of 3357
This guide is the bomb, and Sean!!! +rep

I've read the guide and 20+ pages and have a quick question. Is there any place in the guide I should deviate from for Ocing a newly purchased 680 rather than the 670?

From my study of the guide it seems to be more of a Kepler Ocing guide rather than a gtx 670 guide.

What do I need to consider that is not covered? Is there any information that only applies to the gtx 670?

Thanks a million for your hard work and all you've done for overclock.net
Edited by bce22 - 9/28/12 at 8:51pm
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