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Trying to find out whether my card is special..

Poll Results: How far does your best GTX 680 Boost OC?

 
  • 10% (1)
    <1200MHz
  • 0% (0)
    1201-1225MHz
  • 20% (2)
    1226-1250MHz
  • 30% (3)
    1251-1275MHz
  • 20% (2)
    1275-1300MHz
  • 0% (0)
    1301-1325MHz
  • 20% (2)
    >1325MHz
10 Total Votes  
post #1 of 7
Thread Starter 
Hey guys I have had a GTX 680 that does 1250MHz boost with power target maxed to 132% and was looking to see if anyone had much success getting there or getting further.

Cheers
post #2 of 7
Thread Starter 
Thanks I was hoping to try to get to 1260 without overvolting but it didn't go so well, so I BIOS unlocked using KGB and all is well.

The bios unlock settings I used were to increase maximum possible power use to 150% (adjustable in evga precision - resting at 142%), overvolt the base and boost voltage to maximum 1.200V (not game to try further seeing how nvidia has sabotaged higher voltages with "electromigration" and a lower life span) and the fan speed unlocked to 100%.


I managed 1267Mhz boost with ease and was stable at 1280MHz and could even pump the memory a bit more.

I'm going to look into adding my GTX 680 to my loop so that it can run sub ambient or at most a max of 30C on a hot (40C+) day.
post #3 of 7
first, my 670 dc2 non top did 1285, updated drivers and now only does 1280. actually average slighty above average.
second, unless youre using a bong or 'extreme' cooling, you will never get below ambient temps. it is impossible.
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post #4 of 7
only for GTX 680?
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by pc-illiterate View Post

first, my 670 dc2 non top did 1285, updated drivers and now only does 1280. actually average slighty above average.
second, unless youre using a bong or 'extreme' cooling, you will never get below ambient temps. it is impossible.

Quite interesting... you didn't mod your BIOS at all? Nvidia has been proven to make changes in driver revisions that limit what people can do with their graphics cards in terms of OC (think 590s burning out). Mayhaps the DC2 that Asus provides had some very minor voltage adjustments in the BIOS, and nvidia clamped down - but I can only speculate. Perhaps it is proof of electromigration damage? Nvidia put out a statement as to why they disabled voltage adjustments (Google?) and to paraphrase said it boiled down to excessive electromigration or 'electromigration in key sections of the cards' that caused the cards performance to be 'significantly impaired'. In short - you overvolt and your card goes slower.

Bong? I wouldn't say 'sub-ambient" unless I meant it, especially on a website called "overclock.net". I have a modified Boreas and a hot and a cold loop stemming from it. Current room temp is 30C and the cold temp is 24.9C (at 40% cooling power). I'm gathering parts and tools for a rad box for the sub ambient loop set up, expect (in future!) a build log/update.

For reference when I had my 590 on my loop the cores used to idle at 13-14C and on load 20C.
Quote:
Originally Posted by Sharchaster View Post

only for GTX 680?

I know right? But it is Kepler, and then again it would be unfair to those who own 690s (1.2GHz on air) unless somehow (magically) a non reference 690 (hint - MARS 3) showed up out of nowhere and mopped the floor with our frequencies.
post #6 of 7
Quote:
Originally Posted by Phirebird View Post

I know right? But it is Kepler, and then again it would be unfair to those who own 690s (1.2GHz on air) unless somehow (magically) a non reference 690 (hint - MARS 3) showed up out of nowhere and mopped the floor with our frequencies.

I mean, you just make a poll for a GTX 680, right? I have a GTX 670, so I can vote on it too, or I can't?

Edit : or If you allow me to give the information of my card, I can get stable 1320 Mhz on 3DMARK11 with +170 Core offset and +624 on memory and 1300 Mhz on games...my temperature is 68C (due to my ambient temperature between 29 - 31 C) WITHOUT modding BIOS...IF I decide to do it, maybe I can get a higher clock speed, but I don't need that things...as now my graphics card are more than enough to run most of games @60 FPS except for Metro 2033, Crysis 1.
Edited by Sharchaster - 12/16/12 at 1:32am
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post #7 of 7
Thread Starter 
Yeah well we are talking about a specific line sadly, I can make another poll for 670s if you'd like?

It would probably get way more hits as the 670s have a higher core and a lot more are available cheaply than the 680/690 (order of availability wink.gif).

The reason being is because the cards themselves are pretty different, the 670 is a lower thermal load due to having 188 shader units disabled compared to the GTX680, resulting in a default of higher boost clocks than the 680 out the gate. The 690 is two fully fledged 680 cores crammed into a tighter space so the thermals are much greater on each GPU as well as the limitations on the power input and regulation by both the PCI-express port itself and the power cables, so it clocks much lower than the regular 680.

I would have no qualms using a modded bios on the 670, I am unsure as to whether they also have a fan speed cap however my card stays stable at <=60C during a 30C day with a .025v overvolt and +160mhz core due to having a fan profile that scales to 100% instead of 85%. That helps keep the card at boost clock rates during heavy gaming/benching.

Overvolting the 670 may be a little bit 'safer' than with a 680, or not at all depending on what nvidia meant by 'sections' of the GPU being affected by electromigration when overvolting, however I would do it just cause the power usage is still less than that of a 680. Anyway its your card and I remember feeling a little uncertain when I used the KGB unlocking tool but it worked without a hitch!

I was considering bringing the voltage closer to the boards 'hard limit' of 1.215?v but nvidia's spooked me a bit and I am not a fan of being spooked, I might just swing in for the AMD HD8970 if it shows a lot more promise from the 7970 (than what the 6870 was to the 5870).

Again I haven't been running this voltage for long, and part of what nvidia said was that it would be a shortening of the cards lifespan at higher voltages, so maybe check around and see if anyone has recorded performance issues with their card after keeping it overvolted over a period of time.

EDIT: GTX 670 Boost poll here
Edited by Phirebird - 12/16/12 at 4:46am
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