Overclocking my Asus GTX 780 DC2 OC edition

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sjaveri

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Jan 13, 2014
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I am fairly new to overclocking and decided to give it a go on my new graphics card, the gtx 780 from Asus. I game at 1440p resolution with an i5-3570k CPU currently. I read up a little online, and i found a site which said to begin the OC i should maximize the power target and voltage in GPU tweak software, and let the temps reach 85 or so. After that, to keep increasing gpu boost clock and memory in small increments till i see artifacts or crashes in heaven benchmark or any game. Lastly roll back a little so that the overclock is stable.

Here is what i have been able to get so far, is this a safe overclock for a pc that is on 24/7? I dont really use it that much, just a couple hours gaming a day maybe, but i leave the pc on usually.

Also, i have seen most people get their 780 to a boost clock of 1150-1200. Mine only seems to do what i have shown in the pic, anything above and bioshock infinite benchmark crashes. Is there something wrong with my settings?

2q84m4i.jpg



By a safe overclock i meant keeping the power target and gpu voltage maxed out on the gpu tweak software. I believe temps are the main culprit when hardware fails, so by limiting the temps to 79 as is the default setting, it should be ok correct?
 
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Brantyn Gerik

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Sep 18, 2013
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There is safe overclock, and there is also stable. Your overclocks are unstable and temp is not your limit (that card should never get over 75 degrees anyway unless you suffocate it. pull back your core clock by about 20. Just because someone else gets that high of an overclock with the card does not mean you will get the same overclock. It's always best to start from a ground up overclocking and the slowly increase clock speeds until you get a crash in a gpu stressing program, then dialing it back to a stable level. with the direct cuii, your temps will not likely be the limiting factor, but rather the limits of the chip based on the voltage. If you want it to b more stable, increase the voltage
 
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Brantyn Gerik

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If it crashes in a game, then it is not a game stable overclock. Unlike the benchmarks, games require a lower core clock to be stable as the clock speeds often jump around and various other things cause them need a lower clock speed to be stable than the benchmarks
 
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sjaveri

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Jan 13, 2014
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My voltage is maxed. The data on my screenshot is for the highest stable overclock i am able to achieve. Any higher on the boost clock and my bioshock infinite benchmark crashes. The current settings however have not given me any problems at all. I was just worried about the longevity of this card with the voltage maxed out. I did a test an hour ago by leaving all other values as they were and bumping the voltage down all the way. No crashes at all, everything runs fine at the stock voltage at well. This is strange though, because what is happening is the maxing of the voltage doesn't seem to be helping in any way :(.

Also as far as temps go, by changing the target from 79 to 85, my temps do actually go that high. Seems like they go as high as possible because the gpu boost is kicking in and running till it hits the temp ceiling as programmed into the software. My fan profile is on auto as well.
 
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Brantyn Gerik

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Hmm, try increasing case air flow. but honestly the direct cuii is a tough card and can take a lot of overclocking. If you keep the temps under 80, you shouldnt have any problem with the longevity of the card.

I have fairly good airflow and with voltages maxed i get 1286 as my boost speed, and +540 on the memory.

This is entirely due to luck of the draw however, as my 780 has the much better samsung memory modules while yours will have the crappier ones that don't overclock much past +100. After 2 hours of furmark burn in test my temps settle around 75 degrees with the fans still being pretty much unnoticeable
 
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sjaveri

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Jan 13, 2014
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Yup i've manually set the temp target to 79 to prevent long term damage to the card, but i know they can definitely go higher as i just tested it out earlier. Im using the Corsair Obsidian 750D case currently with stock fans which they came with. My memory clock seems to be doing pretty good, i can probably raise it even further actually, but i am hardly getting any performance gain in games at this point by increasing so i stopped. Its just the boost clock which seems crappy as im not even able to do 1100. The memory you were referring to, that's related to the boost clock speeds or the memory clock?
 
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Brantyn Gerik

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The best thing for these cards is an intake fan blowing up from the bottom of the case
and my mem speed is a completely different thing from anything boost clock related,

the core speed of 1286 is just my luck

what you can do, and what i had to do, was tighten the screws on the back of the card. these coolers often come poorly installed. you should be able to get at least a half turn out of each screw. this will greatly help with temps depending on how much more you can tighten it (obviously don't overtighten, but you should be able to tell when you can't turn it anymore safely)
 
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Brantyn Gerik

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also just noticed, it looks like you boosted your memory clock before the core clock.

redo your overclocking test starting with the core clock and not touching the memory clock until you have found your max core clock, and dialed it back to a stable level.
 
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glewin7

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yo man, you need to get precision x first of all as it runs kepler cards more stable than any other overclocking program, I hate to say it but even better than MSI, and that's coming from an MSI 780 owner.. So grab that, you want your temps below 70 degrees celcius as that is the first barrier at which kepler cards automatically throttle, although gpu boost 2.0 is supposed to allow you to adjust the temperature limits, the card's built in features really only take your settings as suggestions and then dynamically adjust on their own anyway, so just aim to stay below 70C and you wont get any throttling. When monitoring you want to prioritize your temperature and your core clock. Give as much power percentile (GPU offset %) and voltage as the program you are using will allow, once again 7XX series cards automatically adjust anyway so I really doubt you're going to damage your card with all the built in fail-safes Nvidia has on their new GPU's. Also once a program like afterburner or precision x recognizes that you are running a 780 it will only allow you to turn up a certain amount of voltage anyway. Slowly turn up your core clock by 10MHZ increments while playing a demanding game (just alt+tab back and forth) until you get a crash, then revert to your last stable clock (+100MHZ for example). Also you want to make sure that your ACTUAL core clock (which will be monitored by your program simply as core clock) is flat-lining (running one consistent number and not changing, although the clock will lower when you alt+tab out of the game). A flat-line clock speed means that the GPU is running stable and does not need to fluctuate, fluctuation decreases performance and can introduce studdering. Once you have your core clock dialed in and stable, raise your memory clock by +25MHZ increments until you crash, revery back to the last stable memory clock and voila! you are finished!
 
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