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~~The GTX 670 Overclocking Master-Guide~~ - Page 151

post #1501 of 3357
Quote:
Originally Posted by justanoldman View Post

Sorry if this is dumb question, but why does everyone just talk about the core clock when talking about o.c. ability? With some of these cards it seems the memory clock is able to go much higher and that adds to your fps. So is it possible to have a card with less than a great core number but a good memory number that produces more fps than a card with high core but low memory?

http://hardocp.com/article/2012/05/10/nvidia_geforce_gtx_670_video_card_review/7

"In our testing, we saw more of an advantage overclocking the GPU frequency, than we did the memory. The memory was actually able to overclock higher, but doing so hurt our maximum GPU core clock headroom. We'd rather have as high of a core clock frequency as possible."

I think it depends of the game though, some games prefer core, when the others prefer memory.
Edited by Sharchaster - 1/30/13 at 5:49pm
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post #1502 of 3357
Quote:
Originally Posted by kitoxx View Post

i am having this exact same issue (low stable clocks with no thermal or power throttling) but with slightly higher clocks....i think it may just be our chips/cards


my card: Gigabyte GTX 670 WF3 OC
my max stable atm:

Core v: +100
Power limit: 112%
Core clock: +113
Memory Clock: +351

i had issues getting my memory clock above 200 which i thought was strange but even more strange was that upon pushing it above 300 i found it became more stable (+100-200 stable) (+200-300 unstable) (+300-350 stable) all played around with while core clock was at +111 or +113.

maybe just try one run @ +331 or something...(also found having an odd number can help with stability with core clock and mem clock)

What I have noticed is that the max GPU core clock only goes to 1215 (where it crashes) after pushing the numbers up beyond +103. For example, between about 95 and 103 it will never go up there and indeed will stay at 1201.9mhz, but between 104 and about 112 I think, it does go up. After that it pushes it even higher. The same applies to the max GPU memory clock which, in GPUZ anyway, goes to max the moment you set it - so I know +281 is the max stable memory as at +282 it pushes into the next "step" which makes it unstable on my card when testing. This step stays the same from +282 to about +295, so its really not about what score you can push up to in your overclocking tool, its more about what the speed is in GPUZ as it tends to stay the same between two points when you define it on your OC tool. Im a bit drunk so I hope this made sense. If I knew the formula for each step it would be easier but alas I don't.

Over the next few days Im going to test pushing it way further and seeing if I can get out of this unstable range but if not I won't be too fussed. My Heaven score sits at about 1212-1215 now which is strange because at a lower clock (about 3 less GPU and 10 less memory) I was getting 1222 consistently so I might actually downclock after testing if these results ring true.
post #1503 of 3357
yer im still getting my simple head around these keplers, but i get what you mean about the ranges and about how what you set in the OC tool can vary from what is displayed in GPU-Z....

keep me posted with how you go...

more testing to be done here too...
 
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post #1504 of 3357
Quote:
Originally Posted by Sharchaster View Post

http://hardocp.com/article/2012/05/10/nvidia_geforce_gtx_670_video_card_review/7

"In our testing, we saw more of an advantage overclocking the GPU frequency, than we did the memory. The memory was actually able to overclock higher, but doing so hurt our maximum GPU core clock headroom. We'd rather have as high of a core clock frequency as possible."

I think it depends of the game though, some games prefer core, when the others prefer memory.
Thanks for the info. It just seems like my $339 card that only does 1163, which is quite bad from what I read, can do 49.3 fps in Heaven with all maxed settings at 1920x1080 which doesn't seem that bad. I guess I am just trying to figure all this out.
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post #1505 of 3357
Quote:
Originally Posted by justanoldman View Post

Thanks for the info. It just seems like my $339 card that only does 1163, which is quite bad from what I read, can do 49.3 fps in Heaven with all maxed settings at 1920x1080 which doesn't seem that bad. I guess I am just trying to figure all this out.

maybe you should try your OC on the games like FC3 or BF3, you will know what is the more important between core and memory.
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post #1506 of 3357
Quote:
Originally Posted by justanoldman View Post

Thanks for the info. It just seems like my $339 card that only does 1163, which is quite bad from what I read, can do 49.3 fps in Heaven with all maxed settings at 1920x1080 which doesn't seem that bad. I guess I am just trying to figure all this out.

How far a card can oc is all luck of the draw. You can however use a modded bios to get more voltage which may allow you to have a higher stable oc. With a modded bios I can have stable heaven runs at 1280 mhz. Crashes in games though, FC3 and BL2. Bios mod is easy, reversible, and worth a shot if you are willing to do a few more hours of tweaking your card.
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post #1507 of 3357


this seems to be all i can squeeze out of it....... i'm relatively happy with 1228/6696 (i can run any game i choose without crashes and Kombuster and Furmark doesn't get to 70C) i have managed runs of heaven with higher scores at higher clocks but it wasn't what i would consider 100% stable (if i remember correctly BF3 didn't like it..)
Edited by kitoxx - 1/30/13 at 7:06pm
 
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post #1508 of 3357
When I OC my second 670 FTW when it comes in will I need them at the same or similar clocks? Or can I have each at whatever it is that they will do max separately?
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post #1509 of 3357
the fastest card will be downclocked to the slowest cards speeds
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post #1510 of 3357
This is really quite strange. So at +281 memory clock, its stable. At +282 it crashes. It crashes anywhere after that too, up to about +300. I just pushed it all the way to +350 and it was stable in four Heaven runs! Pushed it to +400 and it crashed on the third run.

Not sure if I can be bothered to test beyond that and might just move it down to +281 to be on the safe side. I spent hours and hours getting to the "perfect" +281 clock. Dont like the idea of doing all of that again from everywhere between +350 and the maximum!
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