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[Official] EVGA Classified & K|NGP|N Owner's Club - Page 1143

post #11421 of 21377
Sorry to bother you guys with a nub question, but I'm working on OCing my 780 classy from stock and am a bit confused about the voltage limits of the default LN2 (meaning the 115% power target one, right?) bios.

I was under the impression that, using the classified.exe program, one could bring the voltage all the way up to 1.35V, which is more than enough for my stock cooler. However, whenever I change the NVVDD value in classified.exe, the voltage doesn't change and is instead seemingly capped at ~1.18V as reported by GPU-Z and Precision X.

Do I need a custom bios to go over this limit?

Thanks!
post #11422 of 21377
No, you'll need a multimeter to measure it.
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post #11423 of 21377
Quote:
Originally Posted by Soulfire View Post

Sorry to bother you guys with a nub question, but I'm working on OCing my 780 classy from stock and am a bit confused about the voltage limits of the default LN2 (meaning the 115% power target one, right?) bios.

I was under the impression that, using the classified.exe program, one could bring the voltage all the way up to 1.35V, which is more than enough for my stock cooler. However, whenever I change the NVVDD value in classified.exe, the voltage doesn't change and is instead seemingly capped at ~1.18V as reported by GPU-Z and Precision X.

Do I need a custom bios to go over this limit?

Thanks!

Yes. Simply flash the appropriate Skyn3t bios. (rev 4) over your LN2 bios. (Which you should save for a backup.)I'm a loser.

For everyone's knowledge:

I OC'd and benched 87.2 on Vally Extreme HD today thanks to that PWM setting! I went as high as 472KHz. It stabilized my OC extremely well! VRMs didn't get too hot either. OC was 1.425v to get to 1419/38xx and it was glorious.

With the PWM setting at 317(?)KHz I'm getting ~1338Mhz at 1.35v. Happy with it for my daily driver gaming setting, I think. Great improvement from the past 1280mhz.
post #11424 of 21377
Quote:
Originally Posted by Soulfire View Post

Sorry to bother you guys with a nub question, but I'm working on OCing my 780 classy from stock and am a bit confused about the voltage limits of the default LN2 (meaning the 115% power target one, right?) bios.

I was under the impression that, using the classified.exe program, one could bring the voltage all the way up to 1.35V, which is more than enough for my stock cooler. However, whenever I change the NVVDD value in classified.exe, the voltage doesn't change and is instead seemingly capped at ~1.18V as reported by GPU-Z and Precision X.

Do I need a custom bios to go over this limit?

Thanks!

Quote:
Originally Posted by varthx View Post

Yes. Simply flash the appropriate Skyn3t bios. (rev 4) over your LN2 bios. (Which you should save for a backup.)

For everyone's knowledge:

I OC'd and benched 87.2 on Vally Extreme HD today thanks to that PWM setting! I went as high as 472KHz. It stabilized my OC extremely well! VRMs didn't get too hot either. OC was 1.425v to get to 1419/38xx and it was glorious.

With the PWM setting at 317(?)KHz I'm getting ~1338Mhz at 1.35v. Happy with it for my daily driver gaming setting, I think. Great improvement from the past 1280mhz.

Start by using a multimeter! GPU+Z, precision and afterburner CAN NOT properly read your voltage! Until you use a multimeter, assume they are too dumb for their own good and that the voltage is correct as Classified Voltage Tool says.
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post #11425 of 21377
Quote:
Originally Posted by Scarlet-Tech View Post


Start by using a multimeter! GPU+Z, precision and afterburner CAN NOT properly read your voltage! Until you use a multimeter, assume they are too dumb for their own good and that the voltage is correct as Classified Voltage Tool says.

What pins should we use to check our voltage, if we become so inclined?
post #11426 of 21377
Quote:
Originally Posted by varthx View Post

What pins should we use to check our voltage, if we become so inclined?

Buy a probe it (9.99) or carefully use the two pins on the far left of the probe it connecting spot. I suggest the probe so you don't short anything.

Take note that this issue has been out since the classified voltage tool was released, and there is probably 40 pages total of it being explained, so much, the is returns on Google even.
Edited by Scarlet-Tech - 4/19/14 at 1:13am
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post #11427 of 21377
Quote:
Originally Posted by fanaticstv View Post

So I was benching my 780 Classified and it was starting to make this really weird noise, almost like coil whine. But the thing is I have a water block so there shouldn't be any coil whine right? the noise would increase the more FPS i would get and it would also change depending on what the scene was like during the bench mark.

I have a youtube video recording of it here:
I have till the 24th to return it to amazon, should I set up the return for that right away?

I used to get real bad coil whine on both my Gpus when i was using an OCZ 850w psu. Since i changed out for a Superflower 1200w it has all gone even in benchmarks like 3dmark which used to whine real bad..

From my personal experience it is due to PSU mostly due to bad voltage regulation and poor ripple measurements...
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post #11428 of 21377
Ah, I see! My apologies for not finding it; I googled for quite a while, but must've not been paying enough attention.

So the conclusion is that the voltage IS changing to what classified.exe states, but it is not being measured, correct? Is it reasonably safe to assume that the voltage is in fact what has been set in classified.exe?
post #11429 of 21377
Quote:
Originally Posted by Soulfire View Post

Ah, I see! My apologies for not finding it; I googled for quite a while, but must've not been paying enough attention.

So the conclusion is that the voltage IS changing to what classified.exe states, but it is not being measured, correct? Is it reasonably safe to assume that the voltage is in fact what has been set in classified.exe?

It is reasonable, yes. Especially if using an unlocked voltage Bios. If the voltage is locked, it seems to shut the card off when it tries to overvolt (tried it on the stock BIOS and on the original LN2, both shut down immediately.
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post #11430 of 21377
Quote:
Originally Posted by Scarlet-Tech View Post

It is reasonable, yes. Especially if using an unlocked voltage Bios. If the voltage is locked, it seems to shut the card off when it tries to overvolt (tried it on the stock BIOS and on the original LN2, both shut down immediately.

Hmm, that's interesting; I'm on stock LN2, and am stable 200+ core clock and 400+ memory clock so far on 1.25V (probably overvolted a lot but haven't felt the need to go down any yet since temps are capping at 73C). I got my Classy a couple months ago; maybe it's a newer LN2?
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