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680 Overclocking (Calling all owners!) - Page 19

post #181 of 1059
I would still try 2.5..
I couldn't get through test 26 on 3.0 at all, everything else runs fine.
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post #182 of 1059
NVIDIA must have made some farily radical changes or are already pushing these cards near their limits. 1.175v already seems very higher for a 28nm part. These are higher stock voltages than their 40nm predecessors.

Anyway, has anyone checked for errors/throttling with more strenuous tests than Heaven?

Also, when throttling or performance loss becomes evident, is this reflected at all in reported clock speeds?
Quote:
Originally Posted by Murlocke View Post

EDIT: If your driver crashes (heaven crashes) then you need to restart your entire computer. This is why many people are claiming "I can do +170/+500 but its slower than +150/+500". I've tested it thoroughly and even resetting Precision does not fix it.
I can easily do +190/+500 in heaven stable for at least 5 loops after a driver crash. After I restart my computer heaven will crash instantly and I have to go back down to +135/+500. This is why i'm taking all these +155 to +200 results with a huge grain of salt. I'm looking at their FPS and it's low compare to mine, which leave me to believe they are not restarting their comp after each crash. Even though the card says it's being utilized to 100%, it is not.
Look at FPS in heaven, crash driver, then look at it again. It will be 5-10FPS lower until you restart. Not a full load on the card = unstable overclocks become stable.
EDIT2: The above may only happen when overclocking the memory clocks. I'm just had a crash where it did not happen. Keep an eye on your FPS on the start of Heaven. If it's lower than normal, I suggest restarting your computer before testing for stability.

Sounds like what happens when ECC detects an error. Anyone know if ECC is enabled on the 680s?

There should also be tools available to restart/reload the display driver without a full system restart. Windows SDK has some such component, and Rivatuner used to have this feature. Haven't messed with this is a while though.
Quote:
Originally Posted by Murlocke View Post

We found out in the other thread that setting your fan to 65%+ drastically increases your overclocking stability. Even if your temps are fine.

All temperatures are relative. Stock temp ratings are often only fine for stock speeds. The higher you go the colder you need to be.
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post #183 of 1059
Thread Starter 
Quote:
Originally Posted by Blameless View Post

NVIDIA must have made some farily radical changes or are already pushing these cards near their limits. 1.175v already seems very higher for a 28nm part. These are higher stock voltages than their 40nm predecessors.
Anyway, has anyone checked for errors/throttling with more strenuous tests than Heaven?
Also, when throttling or performance loss becomes evident, is this reflected at all in reported clock speeds?
Sounds like what happens when ECC detects an error. Anyone know if ECC is enabled on the 680s?
There should also be tools available to restart/reload the display driver without a full system restart. Windows SDK has some such component, and Rivatuner used to have this feature. Haven't messed with this is a while though.
All temperatures are relative. Stock temp ratings are often only fine for stock speeds. The higher you go the colder you need to be.

- Heaven 3.0 is the only thing crashing my card.. other games (and 3dmark11) do not even with the same overclock. Furmark doesn't even load the card completely (NVIDIA capped the TDP in it or something?).

- My card is not throttling at all with TDP set to 132%.

- The driver actually reloads just fine but performance never comes back to 100%. I just had a driver crash and my card was performing at about 75% of it's max this time. I tried everything to get the performance back, but in the end the only thing that works for me is restarting the computer after each driver crash.

- I can keep my card at 59C and my max overclock on the core does not improve even 5MHz over keeping it at 80C. That was a false alarm before we realized the driver crashing was hindering our performance (even after it recovers).

This card surely is a odd one. tongue.gif
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post #184 of 1059
Quote:
Originally Posted by Murlocke View Post

Just adding that my friend's GTX 680 (came in the same package as mine) can't even get +135 stable. Crashes after about 2 minutes of heaven.
Overclocking on these cards is an extreme hit or miss. EVGAJacob on twitter said we will NOT get voltage control on these because they are at the limit of 2x 6-pin. Voltage control would require an 8-pin. The overclocks we are getting are the max our card will ever get... non-reference cards will overclock much better. There's is no reason to watercool reference 680s since max OC is easily obtained with reference cooling.
Not exactly happy with that information, may return the card. I will be getting a GK110 when it comes out so I may just deal with it.

Good info on the twitter remark... shame the eVGA FTW editions (both 2gb and 4gb) supposedly aren't coming out for a couple of months, and we don't know how much more they could gain anyway.
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post #185 of 1059
Actually 2 6 pins allow up to 225 watts and this card is based on 170 watts at stock settings. At +32% power it is approaching 225 watts but nobody is getting there partially because the voltage can't be raised high enough. And again if you are getting the same reading at 70C and 80C you are not reaching the top of the scale. I guess I'll map it next week.
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post #186 of 1059
Thread Starter 
Quote:
Originally Posted by JKDC View Post

Actually 2 6 pins allow up to 225 watts and this card is based on 170 watts at stock settings. At +32% power it is approaching 225 watts but nobody is getting there partially because the voltage can't be raised high enough. And again if you are getting the same reading at 70C and 80C you are not reaching the top of the scale. I guess I'll map it next week.

My card isn't even reaching 110% TDP... so I hope your right.
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post #187 of 1059
Quote:
Originally Posted by Murlocke View Post

My card isn't even reaching 110% TDP... so I hope your right.

Yeah, I was thinking something sounded off... 6-pin PCI-E connectors are 75w each, and PCI-E slots deliver 75w or 150w depending on the board. If it's really based on the number JKDC mentioned, then 32% should be reachable technically... hopefully some voltage tool will release like I was saying earlier, if this is doable.

EDIT: In fact, isn't PCI-E 2.0 spec 150w for the slot?
Edited by GoldenTiger - 3/24/12 at 9:09pm
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post #188 of 1059
I noticed that even with TDP at 110% or 130% didn't change the fact that I could hit between +170MHz and +175Mhz (And +500Mhz Memory, didn't try above) with default fan profile at 1ºC = 1%, and it still wouldn't hit above 63ºC and TDP was low.

I am sure we can get some more out of them, and even if we can't, I still won't regret my purchase at all! In fact I can't wait to add a 2nd one for my birthday! biggrin.gif
    
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post #189 of 1059
Quote:
Originally Posted by kcuestag View Post

I noticed that even with TDP at 110% or 130% didn't change the fact that I could hit between +170MHz and +175Mhz (And +500Mhz Memory, didn't try above) with default fan profile at 1ºC = 1%, and it still wouldn't hit above 63ºC and TDP was low.
I am sure we can get some more out of them, and even if we can't, I still won't regret my purchase at all! In fact I can't wait to add a 2nd one for my birthday! biggrin.gif

Yeah, I'll be happy if my cards hit around that too, but it seems like we'd get a good chunk more (and it should be capable of doing this) if we got voltage adjustment. On the surface the answer that was provided simply doesn't make sense; now, it could be a board limitation by the voltage controller on the reference design, but the wattage answer doesn't look right to me. I tweeted EVGA JacobF to see if we can get a clarification.
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post #190 of 1059
Quote:
Originally Posted by GoldenTiger View Post


Yeah, I'll be happy if my cards hit around that too, but it seems like we'd get a good chunk more (and it should be capable of doing this) if we got voltage adjustment. On the surface the answer that was provided simply doesn't make sense; now, it could be a board limitation by the voltage controller on the reference design, but the wattage answer doesn't look right to me. I tweeted EVGA JacobF to see if we can get a clarification.


Pencil modding anyone? biggrin.gif

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