GTX 780 Classified Overclock

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kayaknate

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Sep 23, 2014
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Just upgraded from an EVGA 780 SC to an EVGA 780 Classified. With the SC I ran Precision X and had the slider bar for 'power target' all the way up which was 106%. With this Classified model, the default max for this slider is 115%!!! Is the Classified not already clocked higher to begin with? Is it safe to max out that slider as I did with my SC edition?

I am also expecting a second Classified tomorrow to SLI with. I previously understood that a 850W PSU would be enough to handle both cards and the rest of my system. I'd like to use the cards at their max capability. Is 850W enough for them to run with their 'power targets' all the way up, or to overclock them like that do I need a better PSU?

My Build:
Asus VI Hero
i5 4670K OC'd to 4.5 (Cooled with Noctua NH-D14)
16GB Ballistix RAM
840 Evo 256GB
2 500GB WD Blue Drives
5 140mm Case Fans
650W PSU that I was gonna upgrade to the 850W when the second card came in.

Thanks for the help guys!
 
Solution
nikoli707
there are better power supplies out there but it should work fine.

as far as overclocking, you are limited to 1.212v right now with your stock ln2 bios, and you will have no problems running that at a 115% power target. the power target really means nothing unless your clocks are throttling.

ive had my classified at 1.285v with a 133% power target and 1385mhz on the core, side of case off, floor fan blowing, for a quick benchmark run. though temps got up to about 87c. this isn't ideal, but very fast.

you need to go get a skynet bios for your card/s. it will get rid of stupid boost 2.0 and lock in the highest p0 state, unlock a 200% power target, and it will also fully unlock voltage control, was up to 1.35v, but now i think its...
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Jameson Clark

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Jul 15, 2013
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Just as a heads up "bumping" is against forum rules.

As for your question Yes put the power slider all the way up but make sure your temps are ok when your GPU(s) are at full load. The classified is meant for MORE overclocking than the SC so yes OC it. Your 850 w PSU should be good as long as its a good one.
 
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K

kayaknate

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Sep 23, 2014
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Great. Thank you for the response. Sorry for bumping. Hard to keep track of rules for so many forums.

It's the EVGA 850 B2. Sufficient? Also, I've never known/understood completely. Do I have to leave PrecisionX running for the OC to stay or is like once you set the OC the card knows and PrecisionX can be closed?
 
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nikoli707

nikoli707

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Jan 4, 2012
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there are better power supplies out there but it should work fine.

as far as overclocking, you are limited to 1.212v right now with your stock ln2 bios, and you will have no problems running that at a 115% power target. the power target really means nothing unless your clocks are throttling.

ive had my classified at 1.285v with a 133% power target and 1385mhz on the core, side of case off, floor fan blowing, for a quick benchmark run. though temps got up to about 87c. this isn't ideal, but very fast.

you need to go get a skynet bios for your card/s. it will get rid of stupid boost 2.0 and lock in the highest p0 state, unlock a 200% power target, and it will also fully unlock voltage control, was up to 1.35v, but now i think its 1.50v.... either way, its far more voltage than you should ever put to the gk110 chip unless you have liquid nitrogen.

anyways, your allowed to flash your bios without killing your warranty.
http://www.overclock.net/t/1411500/official-evga-classified-owners-club
i would go there, figure out your stock classy bios, and match it to the skynet bios and use nvflash to load it on the ln2 side of your card/s. ask them questions, or you can pm me if you want. also you will find a link to the special classified voltage tuner there. that is what you want to use to control core voltage, its better than msi afterburner(evga precision... dont use precision). you can also up the memory voltage and change the pwm modulation to stabilize vdroop if you start getting high enough clocks. then you can use msi ab to control core and memory clocks, along with the power target, then go thru the process of benchmarking the card/s using unigine valley/heaven and checking the hardware monitor in msi ab to match the power target to your wanted core clock.

its likely with both cards you can find a sweet spot at about 1200-1250mhz with a low enough vcore and have decent temps along with whatever fan profile you can tolerate.

you can save your overclock profile in afterburner and go into ab settings and have it load on windows start. again, dont use precisionx.
 
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