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~~The GTX 670 Overclocking Master-Guide~~ - Page 295

post #2941 of 3357
Quote:
Originally Posted by anubis1127 View Post

PSU should not be an issue.  I have my 680 Lightning @ 1.28V on a 620W Seasonic Bronze PSU, and it folds all day, 24/7, and it's completely stable @ 1326Mhz.

Kepler core clocks increase in increments of 13Mhz, so seeing a difference between 120, and 125 is rather odd to me, unless somewhere in between there is where you card goes +13, or -13Mhz.

What is the ASIC Quality % in GPU-Z, and stock Kepler boost clock on your card?  What clock does +120Mhz get you to?  

Only +200Mhz is rather strange / low to me.  I would start by OCing the RAM on your card considering it is a 4GB card, and if BF4 is anything like BF3, it will go Oooo, there is vram available, let me allocate that right quick.  GK104s are a bit memory bandwidth starved, so clocking the RAM as high as you can is actually pretty useful for getting better performance in games.  Once you get the max memory clocks, then increase in increments of +13Mhz until you find a good clock speed you are happy with.

[edit]

Oh, and you can always overvolt the card a bit, you'll need to flash a modded bios for that.  You don't necessarily have to go full bore at 1.21V (max on reference BIOS), I've seen good results on my 670s even at just 1.187, or 1.195V

I did your method and went for the memory overclock first. It took me longer to get back to you then expected seems lately I haven't had much time to sit down and fully go through it. I cheated on some parts to make the overclock go faster. So instead of increasing the core clock offset by 13Mhz I increased it by 26Mhz each time. When I was stable at a memory offset of +400Mhz I really didn't see any need to go higher as I didn't really notice that much of an improvement going from 300 to 400. Of course maybe it would have scaled better if I went for +100 core clock offset and +500 core clock offset?

Here are the stock clock settings:

GPU Core Maximum Frequency 1097.4Mhz
GPU Memory Maxium Frequency 1502.3Mhz (x2)

Was recorded as highest reading after a run in heaven benchmark.

Here are the scores of that benchmark:



Here was the first overclock attempt as stated above where I reached 120 core clock offset and 180 memory clock offset results:



And here was the second overclock where I did the method you suggested and I managed to hit a a clock offset of +104 and memory clock offset of +400. Once I hit that point I didn't even try to go higher because my temps were already getting high on a 5 minute or so benchmark much less playing a game for an hour/s. Anyways here are the results of that benchmark:



So a whopping 13 extra points in heaven there's no telling how much of a difference that will make in a video (eg: bf4) but I doubt it's gonna reduce the performance so either way win win (I guess?).

I also noticed in his guide that he noted that in precision X you can go to a fan speed of 25% or even below. Precision X doesn't allow me to go below 30%. Also he says Precision X let's you go to 1.175v I can only move the slider to 1.15v I have scoured the internet and apparently that is the way it's supposed to be without doing a bios mod. So the guide is kinda misleading because he either did a bios mod or he has a non-reference card that allows you to go above that. Or maybe the GTX 670 has more overclocking / tuneability than the GTX 680? That wouldn't make much sense.

Just doing a quick test in battlefield 4 running the fan speed at 80% I noticed my temp would hit 70c and according to his guide I would see throttling of the card by 13Mhz. So I went through the next part of his guide. To tune my fan profile for maximum performance. I let furmark run for more than 5 minutes to actually simulate playing battlefield 4. It reached a max of 70c on 85% fan speed ouch. Thing is you can't go any higher. And I'm not really sure I would want to. Because 85% is kinda loud which I don't mind so much but there's a reason why they lock it so you don't wear down your fan faster. And then end up having to replace it with some expensive aftermarket cooler. Which will in turn probably void the warranty. So should I just let it throttle? Do I have any other options? By the way I heard throttling can actually cause a game to crash or cause some other weird instability issues. Which sounds legit because the card no matter how brief it is. It's almost like changing gears in a car if you don't do it right you're gonna stall the car. Now I know that's comparing apples to oranges but serves as a good metaphor that I could think of on the spot.

I obviously have some ideas on potentially bringing down that temp like installing a intake fan in my haf 932 under the video card so it would be feeding the video card cold air in a sense. I possed that question on this forum and another no one has bothered to respond. I think I spend more time trying to get help from other people then just performing experiments of my own. You'd think just asking someone with more knowledge on the subject would be quicker but no it's not. I could have already rearranged my fans in my case and gave furmark a spin to see the temp difference. But at this point I don't think I really care anymore. Spent way too long trying to tweak things then actually playing the damn game I bought.

edit: As I noted above EVGA Precision X doesn't allow you to manually set the voltage to 1.175 but once you boot up heaven or any other gpu heavy task the 1.175v kicks in.
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post #2942 of 3357
just out of interest guys,

if I OC a Gigabyte Windforce 3X 670 OC 2GB
how much more FPS could I expect in say BF4 multiplayer?

My CPU runs at 4.6Ghz. I play with MSAA off and medium / high settings with around 90-110 fps.
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post #2943 of 3357
I can't hold an oc at 122%, but a bigger one at 110% gives me better score in heaven. How does that work?
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post #2944 of 3357
I'm not sure. I noticed similar behavior on my 670 GC cards, at 122% on the stock bios.
post #2945 of 3357
Hey, thanks for the guide.
Quick question though. I am experiencing two perplexing situations. The first is that my Keplar Boost seems crazy low (39). I measured it using GPU-z, Afterburner, and then uninstalled afterburner and checked it with Precision-X, while running a benchmark in Unigine Heaven. 1098 Boost Clock, Highest GPU Core Clock is 1137. A KB of 39 seems a little low doesn't it? Temperature never goes over 50 degrees with the recommended fan curve and power usage never goes over 81% TDP.

The second thing is a strange occurrence when I attempt to overclock the core. I add +2 to the core offset to bring my boost up to 1100. Run benchmark, looks good. Then I Increase by 20 points to +22 core offset. Run benchmark. Halfway through the benchmark, the image will freeze, then my display goes blank. All the while the sound is playing fine. Then I hear the fan drop to inaudible and the display comes back and the benchmark moves forward as if nothing had happened, but fan speed, voltage, even the clock have been reset to stock settings. This isn't what I normally think of as a crash; besides, shouldn't I be able to get my clock much higher than that?

Any idea as to what I might be doing wrong? Could it be I just got a poor quality card? Perhaps something wrong with the way the rest of my hardware is configured?

Here's my video card at stock, with voltage and power target boosted in preparation of an overclock test.
MSI N670 PE 2GD5/OC
1098 Boost Clock
1137 Max Boosted Frequency (1098 + 39) ?
1502 Memory Clock
114% Power and 1150 mV
post #2946 of 3357
Quote:
Originally Posted by AdventureMode View Post

Hey, thanks for the guide.
Quick question though. I am experiencing two perplexing situations. The first is that my Keplar Boost seems crazy low (39). I measured it using GPU-z, Afterburner, and then uninstalled afterburner and checked it with Precision-X, while running a benchmark in Unigine Heaven. 1098 Boost Clock, Highest GPU Core Clock is 1137. A KB of 39 seems a little low doesn't it? Temperature never goes over 50 degrees with the recommended fan curve and power usage never goes over 81% TDP.

The second thing is a strange occurrence when I attempt to overclock the core. I add +2 to the core offset to bring my boost up to 1100. Run benchmark, looks good. Then I Increase by 20 points to +22 core offset. Run benchmark. Halfway through the benchmark, the image will freeze, then my display goes blank. All the while the sound is playing fine. Then I hear the fan drop to inaudible and the display comes back and the benchmark moves forward as if nothing had happened, but fan speed, voltage, even the clock have been reset to stock settings. This isn't what I normally think of as a crash; besides, shouldn't I be able to get my clock much higher than that?

Any idea as to what I might be doing wrong? Could it be I just got a poor quality card? Perhaps something wrong with the way the rest of my hardware is configured?

Here's my video card at stock, with voltage and power target boosted in preparation of an overclock test.
MSI N670 PE 2GD5/OC
1098 Boost Clock
1137 Max Boosted Frequency (1098 + 39) ?
1502 Memory Clock
114% Power and 1150 mV
Sounds to me like you got a dud in the overclocking department.

You can try raising the voltage by flashing a new BIOS, I described how to a bit earlier in this thread.

When everything goes black and then the bench restarts, that's a crash.
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post #2947 of 3357
I can complete all runs with +90 on core at 110%, but can complete only one run of +54 at 122% (out of about 20 runs). Of course, the frequency of the core, voltage and all will fluctuate like it's a prty in there, and the score will be lower than at 122%. However, at 110% I can also oc the memory, which gives me and over all better result.

I have no idea what is going on, and I need an explanation to ease my mind. Like I said, I don't mind low oc, I just was a stable one.
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post #2948 of 3357
Has anyone here had any issues installing the latest few Nvidia drivers? 331.65, 331.58 or 331.40 Beta? For some reason I get basic VGA and "this device has a problem" in device manager.
post #2949 of 3357
try uninstalling the driver first. Reboot in safe mode and reinstalling it again.
post #2950 of 3357
If I go with SLI, do I need to reinstall the drivers when I plug-in the second GPU in my system for the first time?
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