Gigabyte GTX 770 GV-N770OC-2GD Over Voltage?

[bissa]

Hello,

any one was able to overclock his GV-N770OC-2GD voltage to 1.212v?

I tried to increase the voltage from stock 1.200v to 1.212v without any effect, GPU-Z and Afterburner reports the GPU voltage max 1.200v

I tried this program to increase the voltage without success
afterburner
oc guru
precision x

 

[blackened23]

Software does not report proper voltage, generally speaking, with Kepler cards. The only way to properly verify voltage is with a digital multimeter.

First off, default voltage with the 770 at 100% load is 1.175V, not 1.2V. If you input +37mV (or whatever your card allows) in Afterburner then your card should be around 1.2xV when running at 100% GPU load. Note that Kepler's voltage is dynamic, so if you're running a non-intensive program - the voltage will lower as 1.2xV will not be needed for light loads.

The main point, though, is that software will not report voltage properly with the Kepler. GPU-Z does not work in this respect - I had the same issue with MSI lightning 680 where GPU-Z would report 1.175V while a DMM would verify overvoltages above and beyond that. (and obviously the DMM did not match GPU-Z's incorrect voltage reading)

 

[bissa]

I have seen some 770's GPU-Z is reading them 1.212v when applying the extra voltage

I still think the 1.212v is not working correctly in my case as I'm failing my OC stability with the extra voltage and it is just 1 notch over the stable clocks.

 

[blackened23]

GPU-Z does not work. My MSI lightning showed 1.2xV in GPU-Z when the card was using 1.4V. The lightning 680 was the last kepler card to allow over-voltage through software with the original LN2 BIOS....

Trust me, you cannot verify voltage WITHOUT a DMM on a Kepler card. Gpu-Z is not...accurate..... If you put in +31, that is what you're getting, period.

 

[bissa]

btw I'm not talking about the proper voltage, DMM is another story but I mean the GPU-Z should show the +mV increase applied over the stock voltage as it reads the voltage directly from the onboard voltage control and it looks the voltage controller is denying the increase for some reasons.
Well, after more research, GPU-Z should reports the voltage applied (it should show up the increase applied over the stock voltage +mV) and I found that if your GTX 7xx has ASIC quality more than 80%, it won't accept the voltage increase (not sure about that) but I saw some reports for the evga gtx 780 not accepting more voltage too with softwares for unknown reasons.

This is a screenshot from a review and it showing this card showing the voltage increase has been applied and the monitor tool is reading 1212v correctly.

And this is another screenshot, voltage increase is applied but the monitor tool still showing 1200v

 

[ViRGE]

The GTX 770 uses GPU Boost 2.0, so "overvoltage" is actually unlocking one higher boost bin. You don't have direct control over the GPU voltage on these products (the bin/voltage table is fixed) and this feature isn't meant to improve overclocking.

http://www.anandtech.com/show/6994/nvidia-geforce-gtx-770-review/2
http://www.anandtech.com/show/6774/nvidias-geforce-gtx-titan-part-2-titans-performance-unveiled/2

Consequently you'll only see 1.21v show up when conditions permit that bin to be used; when there's enough load and no thermal/power throttling. If you used AB or Precision X then you will have correctly enabled it.

 

[bissa]

Thanks for the info but actually I never saw the voltage go 1.21v even when forcing it with AB, everything is fine, TDP never exceed 70%, Power never exceed 80%, temps never exceed 74c, still the voltage will never bump to 1.21v. What is the secret for some cards not accepting voltage increase? I read it is something related to the PCB...

 

[ViRGE]

Turn on logging in Precision X. The "reason flags" will tell you why the card isn't boosting higher. Unless you're limited by voltage then the card isn't hitting its highest bin.

http://www.anandtech.com/show/6973/nvidia-geforce-gtx-780-review/5

And I doubt this has anything to do with the PCB. Card manufacturers control whether the overvoltage feature is even allowed; if their cards couldn't handle it, it wouldn't even be an option for you to select. The fact that it's an available option means the VBIOS supports it.

 

[bissa]

it that the same as PerfCap reasons in GPU-Z?

When the card under load it is showing VOp , VRel

 

[bissa]

Precision-X is reporting Voltage Limit = 1 what ever voltage is used 1.200v or 1.212v

Do you think trying another bios can have effect?

 

[bissa]

there is a bug, the newer posts are showing before your post

 

[ViRGE]

Precision-X is reporting Voltage Limit = 1 what ever voltage is used 1.200v or 1.212v

Do you think trying another bios can have effect?

If Gigabyte has pushed out a newer BIOS you can give a shot. Otherwise I'm at a loss for explaining why the option is there but doesn't seem to be having any effect.

 

[HeLeX63]

I found a solution for this. I have an MSI GTX 770 Gaming OC, voltage was locked to 1.200 and could never go to 1.212 in any program. I have unlocked my voltage up to 1.300 volts.

I'm currently running at 1333MHz on the core at 1.231V

 

[jra505]

I found a solution for this. I have an MSI GTX 770 Gaming OC, voltage was locked to 1.200 and could never go to 1.212 in any program. I have unlocked my voltage up to 1.300 volts.

I'm currently running at 1333MHz on the core at 1.231V

Care to share how you managed to get your card to 1.3 volts?