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Undervolting and Overclocking GK110(b), featuring GeForce GTX Titan Black

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Hello everyone.

I hope this topic helps users increase longevity of those chips, while maximising their performance.
Informations contained here are mainly for anyone that wants to use GK110(b) class GPUs on air or for users of such cards that have throttling issues (it's also highly recommended if card uses reference "NVTTM" cooling).

Long story short : I got my Titan Black this friday, and I wanted to do some testing on it.
Titan Black front.jpg

But after first test ended, I saw "1,187V" as default GPU voltage in GPU-z...
^"This can't be right..." - I thought,
Since my GTX 780 Ti Reference had only 1,0325V as stock (granted, for ~1020MHz clock - but still too high jump).

Why it's bad to both You (user) and your card to have high stock GPU voltage :
1) GPU Boost 2.0 will throttle card A LOT harder on higher voltage (which means max. boost speed isn't possible for any meaningfull lenght of time), because it works within Power/TDP and temp limits.
2) Higher VRM load (in my case, 1,187V is just two notches below NVidia max. allowed limit of 1,212V), and everything that it means. Here's video on blowing up VRAM VRM from buildzoid : LINK.

Because of that, I decided to so something with this situation using KeplerBiosTweaker.
Max. boost frequency for my card was 1058MHz (seen for first few seconds of test... but it was there), keeping in mind my Titan Black uses stock NVTTM cooler I knew that frequency may be beyond reach (since stability of it depends on die quality and how it scales with voltage), but regadless I gave it a try using software only method first (MSI Afterburner). After few tests on lower and lower voltage, I finished with 1V and that was fine for 1058MHz speed I wanted to set (can't be greedy here, maxing frequency/Voltage is silicon quality and cooling limited).

I opted for skyn3t's Titan Black vBIOS, which has power limit unlocked/GPU boost off, instead of stock one (preference).
Since skyn3t's has 1,212V max. voltage, I had to increase max. table frequency under "Boost table" tab, which in turn would decrease default GPU voltages used for lower frequencies (basic Boost Table to Voltage Table comparison should tell you where you SHOULD end up Clock/VDDC wise).
Going from default "1202MHz" Max. Table Clock (boost table) to "1359MHz" in MY CASE meant I got my 1V GPU voltage on 1058,5MHz frequency.
After I set 1058,5MHz as both base and max. boost frequency for my card, I checked all settings second time and flashed my card...

Result :
Superposition 4k optimised (1V).png

Pretty good :)
(grey bar in "PerfCap reason" means utilisation)

But then I thought : What if I decreased GPU Voltage some more ?
Well, only one way to find out...
Checking voltage table and boost tables again, I set "0,987V" after tweaking Max. Table Clock again, and ended up here :
Superposition 4k optimised (0.987V).png

Of course Fan profile remained the same for both tests.

Conclusion (probably not REALLY accurate, but "good enough") :
+0,0125V = +6W in power (according on GPU-z), and that's on ~1V level, where leakage isn't that big of a deal yet.
However I decided to not use this setting, since 0,975V wasn't stable at all in 3D tests (and it's always better to have some headroom for stability "just in case").

Now, why I decided to created this topic :
Since many first users of highest end cards liked to "maxed" them out on water/air, some users that buy those cards used may end up with cards that have relative high stock GPU voltage (like me).
For anyone that doesn't have skills required to do this, you don't have worry... just yet.
vBIOS should automaticly downclock (and downvolt), overheating card the moment it reaches temnperature threshold (assuming it's not set too high). Because of this, your card won't die fast... in theory.
 
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It's good stuff! Why is this pretty much important is because GTX Titan Black has way better FP64 performance than GTX Titan X Pascal or any other NVIDIA card at the moment, except Titan X Volta and those professional NVIDIA Quadro line cards. Squeezing as much as you can out of GTX Titan Black is crucial for maximizing compute performance.
 
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It's good stuff! Why is this pretty much important is because GTX Titan Black has way better FP64 performance than GTX Titan X Pascal or any other NVIDIA card at the moment, except Titan X Volta and those professional NVIDIA Quadro line cards. Squeezing as much as you can out of GTX Titan Black is crucial for maximizing compute performance.
FP64 test (stock) :
AIDA64 compute mini.png


And after 1V (with unlimited power/TDP) :
AIDA64 compute 1V+ mini.png
 
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1 i used to undervolt my gtx 460 for noise and heat reduction purposes.that arch had quite a lot of leeway in terms of voltage.
2 latest arch from nvidia seem to be very good at low power consumption.
3 are you really using Windows Xp ?
 
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As my first test, I didn't saw anything wrong with it... card supports it, board as well, so I used it :)
It's my backup for older cards I test, day-to-day it's Win10.
 
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Those are huge numbers for that overclock! GTX Titan Black is a rare gem that should be preserved. It must have a water cooler and be overclocked even more! You've managed to overclock the most with least voltage possible - you were still geting 83 Celsius with a stock cooler. It's time to upgrade the cooler and overclock the living daylights out of it!
 
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Kepler scale very well to voltage on ambient temperature. It is sad that Nvidia locked down voltage on 780 Ti and Titan Black to 1.212V. Need hardmod or special cards like HOF / CLS / KP if you want to go further.
IIRC 780 and OG Titan can go upto 1.3V without hardmod. 1400-ish Mhz on GK110 is a beast. That is 40-50% oc potential.
 
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Kepler scale very well to voltage on ambient temperature. It is sad that Nvidia locked down voltage on 780 Ti and Titan Black to 1.212V. Need hardmod or special cards like HOF / CLS / KP if you want to go further.
IIRC 780 and OG Titan can go upto 1.3V without hardmod. 1400-ish Mhz on GK110 is a beast. That is 40-50% oc potential.

Seriously? So if i had a common GTX 780 Ti (which i had before), i could not change the voltage with programs like Rivatuner of Afterburner??? What about Evga cards? Are those unlocked?
 
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Seriously? So if i had a common GTX 780 Ti (which i had before), i could not change the voltage with programs like Rivatuner of Afterburner??? What about Evga cards? Are those unlocked?

You can rise voltage upto 1.212V maximum with normal 780 Ti.
EVGA only Classified and Kingpin can bypass this.
 

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I had MSI 780 Ti Gaming which I sold in spring 2017, overvolted without problems and clocked about 1200MHz IIRC. But it's strange if the voltage can't be changed.. feels more like a software bug.


I can test that Gigabyte GTX 780 what I have, just throw my waterblock to it so I don't even need to drain my loop. Just need to have some airflow to VRM/VRAM.
 
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You can rise voltage upto 1.212V maximum with normal 780 Ti.
EVGA only Classified and Kingpin can bypass this.

I can +1 this statement, my 780ti didn't push beyond 1.212v either.
 

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I can +1 this statement, my 780ti didn't push beyond 1.212v either.
I guess my 780 Ti had the same limits. Can they be bios modded? I remember raising my old Gigabyte GTX 470 SOC's limits by modding the bios.
 
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I guess my 780 Ti had the same limits. Can they be bios modded? I remember raising my old Gigabyte GTX 470 SOC's limits by modding the bios.
No. 1.212V is max. without hard modding PCBs.
Only few cards mentioned before can go above this limit.
 

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Hello, could I ask for your vbios? I recently got a TTB, and 'd like to do some tricks based on your work. Thx in advance.
 

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Hello, could I ask for your vbios? I recently got a TTB, and 'd like to do some tricks based on your work. Thx in advance.
3 years ago about,necro.

Make sure to select nvidia in the very first category or unverified if
 
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I like undervolting stuff too,because I'm very paranoid about the noise my pc produce and it longevity.

Besides, I think that's a very neat way of cramming very high performance in a low power budget. It's a killer for sff builds. The amount of power efficiency you'll able to get is insane when going to 0.7-0.8ish volts.

Good job on the undervolt, thanks for sharing. You don't usually see this kind of posts around here.
 
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