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~~The GTX 670 Overclocking Master-Guide~~ - Page 197

post #1961 of 3357
Quote:
Originally Posted by Forceman View Post

It's safe to leave it at 132%, the card will still only draw what it needs.

Not sure why it would drop the clcok speeds like that - sounds like it is disabling the overclock or something. Does restarting Afterburner fix it? I have seen my card get stuck in a low power state (526 MHz) but never from changing settings.

It's normal for th cards to boost to different levels - you should be able to adjust the offset for the lower card to bring it up to the same speed, or you can try the sync cards control but I'm not sure that really works.

I am using sync settings, I restarted my PC and both cards properly run at the expected speed but if I do any changes I have to do them TWICE because it will drop to 1006 then go up at the offset speed.
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post #1962 of 3357
Quote:
Originally Posted by omega2551 View Post

I've noticed this as well. For the longest time, I was wondering why sometimes my Kepler boost would come out to not be a multiple of 13 while other times it would be dead on. It had me wondering what my true Kepler boost was because it would come out to be anywhere between 117 and 130 MHz. Well, when I am on one of these "sweet spots" my Kepler boost always comes out to be 130 MHz.

It turns out that for my particular card, these "sweet spots" are at +131, +144, +157 and +170 offsets (maybe more but I haven't tested outside these yet).

The kepler boost is 13.065 increments, the decimals are not shown in most software. Use GPU-Z to get one additional decimal.
post #1963 of 3357
Quote:
Originally Posted by batman900 View Post

^You will love that Gigabyte SLI, thats what I have, runs super cool in my cramped case to.

I have a question, does overclocking the memory really have much of a benefit? Also is overclocking the mem just as safe as OC'ing the core on stock volts and good temps? I have never overclocked memory on anything and always heard it doesn't do much but carried more risk than core OC. I can get the core on both my 670s to 1281mhz max boost stable, I tried bumping the memory +100mhz on both cards and ran 3dmark11 but actually lost 100 points. Probably need to drop the core or something? But after seeing that I was like meh at the memory.

Any info is appreciated, TY
OC'ing memory does help, it depends on the game as to how effective it is. BF3 is a good example of a game that loves memory OC. It isn't any more dangerous than OCing core, it's either stable or it isn't. Just OC both get them both stable and enjoy tongue.gif
Found that my new card reaches a higher max core than my first one and has a higher kepler boost (kinda annoying since it runs at the slowest cards speed) but with 2 cards running I don't really think it matters too much tongue.gif
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post #1964 of 3357
Quote:
Originally Posted by kevindd992002 View Post

But how do you measure diminishing returns? Through benchmarks? I still don't understand you regarding the 13MHz increments, sorry, no pun intended here.

To calculate this I used GPU-Z 0.6.8 and would take my Max GPU Clock that I got from Precision X / GPU-Z and then subtract the number from the what it was reporting as the new boost, which is the third box in the GPU Clock row labeled Boost. That gives you your Kepler Boost that I was using for part of my tests.

You also could go off your benchmark scores in a program such as Heaven to see actual performance gains/losses.
post #1965 of 3357
Thanks Drak, I've always OC'd the core and CPU but never touched any memory. $750 worth of cards makes me nervous before getting all the facts. smile.gif I'm being a bit more proactive with my OC now that I ordered a 120hz monitor.

So one more question because this is how I look at Gfx card overclocking. On stock voltage with good temps can u pretty much OC as far as stable allows and it's basically reprocussion free performance for years to come? And the reason they don't come this way from the factory in the first place is because not all cards are garunteed to run at these speeds? I've always done processor OC but Gfx card makes me more nervous. Thanks again!
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post #1966 of 3357
I am not sure it is "dangerous" to oc the core or memory. I believe the worst that happens is your drivers crash. Unless you have a modified bios and/or hard mods that can push through more voltage I don't think anything you do with Precision X or Afterburner can hurt your cards.

I tested a number of 670s and they seemed to love the memory offset more than the core. Getting +150 on the core is not always easy but +500 or more on the memory was not hard at all.
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post #1967 of 3357
I dont think you can damage you card by raising the clocks to a stable level because you cant set a higher VCORE than 1.175V. Theres no chance of overvoltage since thats the max allowed by the bios that the cards comes with and i believe its tested to work else theyd lower it by default. The only other concern are the temps. Ive got my card OCed by +110 on the core and +550 memory and i never go above 65C with fan set to auto. Im not sure how the reference cards handle the heat but Gigabyte did an awesome job with their Windforce x3.

I might be wrong on that so dont take my word for it. Its just my reasoning. Maybe someone more with knowledge will speak on this.
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post #1968 of 3357
So i unlocked the bios with more voltage and more boost.

Setting the Powerslider to 150% // Voltage to 100% // Core clock to 0%

i get
1202 core clock

1.212 Voltage

and 34-37% power.

The best of all, first time it run stable.

The card needs more voltage for anything higher than +120core with 122% stock power boost for sure.
post #1969 of 3357
Quote:
Originally Posted by seithan View Post

So i unlocked the bios with more voltage and more boost.

Setting the Powerslider to 150% // Voltage to 100% // Core clock to 0%

i get
1202 core clock

1.212 Voltage

and 34-37% power.

The best of all, first time it run stable.

The card needs more voltage for anything higher than +120core with 122% stock power boost for sure.
Not really... I run stable at +180 and +575 on my gtx. 60C my max temp with those settings.
My core clock runs nice at 1254Mhz
With stock Voltages. Just maxed the slider to 1.15V
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post #1970 of 3357
How would you reccomend to OC with valley . Same?
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