Unlocking voltage in AB GTX 780 Classified

[Tristor]

Howdy,

I figured I'd make a new thread since I'm late to the game and it'd otherwise be some thread necromancy. I've read through what to do in several places including both http://forums.anandtech.com/showthread.php?t=2341641 and http://forums.overclockers.co.uk/showthread.php?t=18545210

Unfortunately, using Afterburner 3.0.0 Beta 19 (latest Beta) I am unable to get the voltage to unlock to 1.3v. I've already flashed the Skyn3t vBIOS rev4 on both of my Classy's and when I run the command, regardless of whether I do the ri3 or ri4, I get "invalid" returned.

Is there a change in the latest release of AB that removes the ability to do this? Unfortunately it seems most people did this with Beta 14, 15, and 16, all of which are now expired and I am unable to run after installation.

Right now, post flash, I should be able to go up to 1.212v, but I can only do +100mV offset in AB which puts me I don't know where. One reason I want to do the 1.3v mod is that it appears to change AB's interface to specify the actual voltage rather than an offset value for the core, this is much easier for me to work with since an offset requires knowing what the base value is.

Thoughts?

 

[guskline]

Have you installed the Classified Overvolting software?

 

[guskline]

Tristor, I misunderstood your post. Didf you successfully update your BIOS? I updated my Rev B Classy to skyn3t rev 4 Bios

 

[Tristor]

Yes, I succesfully updated the BIOS. As far as I can go in AB since the AB 1.3v voltmod is not working is adding a +100mV offset for core voltage. Unfortunately this limits me to +100 Core and +485 memory before I start minor artifacting (although I can go to +125/+525 without crash). My temps are very good at those settings and I need more voltage...

I have not tried the Classified Voltage Tool yet, because my understanding was it was only necessary if you wished to exceed 1.325v (1.3 with Vdroop disabled). I am sticking with the ACX Coolers for the moment and do not plan to exceed probably 1.25v.

 

[guskline]

Yes, I succesfully updated the BIOS. As far as I can go in AB since the AB 1.3v voltmod is not working is adding a +100mV offset for core voltage. Unfortunately this limits me to +100 Core and +485 memory before I start minor artifacting (although I can go to +125/+525 without crash). My temps are very good at those settings and I need more voltage...

I have not tried the Classified Voltage Tool yet, because my understanding was it was only necessary if you wished to exceed 1.325v (1.3 with Vdroop disabled). I am sticking with the ACX Coolers for the moment and do not plan to exceed probably 1.25v.

I understand. When I watercooled my Classified it really helped with OCing.

 

[Tristor]

I'm going to give the GTX Classified Controller a try. I assume that I should lock voltage control in AB if I'm using this so they don't interfere. I'm setting 1.21250V NVVDD (I assume based on what I'm reading here that this is the Core Voltage) as a base to start overclocking from, since that is is nVidia's safe maximum.

There's not really any documentation or how-tos on this tool that I can find, so I guess I'll play around and hope I don't make anything catch fire ;P

Update: Okay, this tool is fantastic, although I'm not sure if it's setting the voltage back upon reboot. Problem is... it seems I'm triggering over current protection on my PSU once I hit 100% on both GPUs. This means the question I asked back in this thread is now relevant once again http://forums.anandtech.com/showthread.php?t=2370776 I am concerned that I am triggering OCP because the GPUs are sharing a rail as there's no way I should be pulling in excess of 400W on a single GPU currently. There are 6 PCI-E modular connectors and 4 30A rails reserved for PCI-E, so it's possible I ended up connecting both GPUs to a single 30A rail on which I'm drawing the 40-50A required to trigger OCP.

Unfortunate, but looks like I'm going to have to do some playing around and possible run a second modular PCI-E cable for the 2nd 8-pin connector on each GPU. For the moment though, at least I know I can raise voltage as needed using this tool. I am hoping it's persistent across reboots like AB is.

Update 2: It's not persistent across reboots. That's... disappointing. I'm a bit miffed I cannot get the AB voltage mod working, as it seems I am unable to find anyone else suffering the same issue. I'm not sure what's specific to my situation which is causing it to fail.

 

[KaRLiToS]

Flash your BIOS to the skynet one like guskline proposed.

http://www.overclock.net/t/1393791/official-nvidia-gtx-780-owners-club/0_30

FOR CLASSIFIED BIOSes http://www.overclock.net/t/1411500/official-evga-classified-owners-club/0_30

Skynet BIOS + Evga Precision X is my thing.

 

[Tristor]

I suppose I'll give Precision X a try, however my understanding is that it has the same voltage limits that Afterburner has, but no way to lift them unlike AB. I've already flashed to Skyn3t vBIOS rev 4 successfully as noted above. Getting the voltage mode for AB working would be my preferred solution, however since it doesn't seem that anybody else is having a problem I don't even know where to begin troubleshooting why it's not working. I found out that I can specify specific cards using /sg${slotid}, so I explicitly attempted the /ri3,20,99 and /ri4,20,99 on each card and received "invalid" back on both cards both times.

 

[Grooveriding]

You can only adjust your voltage beyond 1.21 with the Classified Voltage tool. Afterburner/Precision X will not be able to read those voltage adjustments beyond 1.21 either. You'll know it's working though because your temperatures will rise and you'll find some more overclocking headroom.

That Skynet BIOS is a must as well because you'll be against the hardlocked power limit in the stock 780 BIOS very quickly with additional voltage. Without it your card will just throttle and you'll get nowhere.

 

[Tristor]

You can only adjust your voltage beyond 1.21 with the Classified Voltage tool. Afterburner/Precision X will not be able to read those voltage adjustments beyond 1.21 either. You'll know it's working though because your temperatures will rise and you'll find some more overclocking headroom.

That Skynet BIOS is a must as well because you'll be against the hardlocked power limit in the stock 780 BIOS very quickly with additional voltage. Without it your card will just throttle and you'll get nowhere.

Okay, that's good to know. Do you happen to know if there's command line flags or something that I can use with the Classified Voltage Tool in order to make it set the voltage on boot? I work nights so I shut my computer off during the day to reduce heat buildup in my room so I can sleep. I'd like to be able to boot up and go without resetting manually. I've already verified I have significant additional headroom using the voltage tool.

 

[rtsurfer]

Okay, that's good to know. Do you happen to know if there's command line flags or something that I can use with the Classified Voltage Tool in order to make it set the voltage on boot? I work nights so I shut my computer off during the day to reduce heat buildup in my room so I can sleep. I'd like to be able to boot up and go without resetting manually. I've already verified I have significant additional headroom using the voltage tool.

To answer your question.

NO you cannot set the voltage after boot because anything above 1.2V wasn't considered to be safe for everyday use no matter what kind of cooling you got.

As you have discovered the voltage tool allows you to go till 1.5V.