Greetings folks,
 
First off, I would like to say that I have searched this forum and the web for numerous hours already and have read loads of suggestions but to no success.
 
Here are my specs:
 
OS - Windows 8.1 Pro 64-bit
CPU - Intel i7 4770K
RAM - 32 GB Corsair CMY32GX3M4A1600C9
Mobo - Gigabyte G1.Sniper 5 (Bios F7 latest official release) I have tried the latest Beta version F8d
Graphics - 2 * EVGA GeForce GTX 780 Ti SC ACX 3GB - SLI Enabled (Max Performance) - Latest Official Nvidia release & Latest Nvidia Beta Release
HDD - Samsung SSD 840 Pro 256 GB
PSU - Silverstone Strider 1200W Gold Evolution
 
My Issue:
Video Card fans will spin up to 100% randomly, no particular action will set it off. This can happen when the system is idle, copying data, browsing the net, watching Youtube, playing a video on VLC to playing video games. It can have intervals of a few minutes to a couple of hours between spin ups.
 
Diagnose:
Precision X, HWMonitor & Speccy has been used to monitor the behavior.
Idle temps for both cards avg 35C. Checked to see if the temperature changes when catching the fans at 100%.
The temps don't change, however with Precision X I'm able to control the fan speeds and I did setup a profile with my own curve.
Left it for a day, but it still managed to bypass my curve and spin up randomly.
 
I've done clean installs and only put the bare minimum, I've disabled my onboard graphics via the bios. Primary display is set to Pcie1.
I have been gaming and I don't seem to have any issues, I'm yet to do a full stress test but just the fact of hearing those fans rev up bugs the hell out of me.
All my other other fans in the case (Corsair 900D) are fan controlled including my Corsair H110.
 
Something did catch my eye on GPU-Z in the Bus Interface, both cards would read PCI-E 3.0x16 @ x16 3.0 when selected.
However after waiting a couple of seconds it would read PCI-E 3.0x16 @ x16 1.1.
Now I read that this was normal behavior, for saving power output and that if I did a render test full screen both would display 3.0
However doing a render test full screen starts off with both cards @ 3.0 but then the bottom one drops to 1.1, I'm yet to read up on that.
 
I hope I've given enough details to start with.
This system is my first SLI setup,  so I'm still learning the ropes.
 
Thank you for taking the time to read this and hopefully help me on my quest to silence these fans !!
 
Mero
 

Hello maniacvvv
 
Thank you for your welcome and response.
I will give your suggestions a go, however over the course of my many clean formats I've only had two of those software mentioned installed in one instance.
Each time however had Precision X.
 
I do not have any other software that control my fans, I have a good old Zalman fan controller for all my fans in my Corsair 900D. (Hence the temp monitoring tools)
Why I didn't go with MB fan headers? 1. I have too many fans 2. Wanted manual control for silence operation under the right environment 3. The motherboards CPU bios sensor is off by 10 Degrees and would make my H110 go nuts at times.
 
This case (Corsair 900D) is huge, and I wouldn't think that having this SLI setup would be an issue, like I mentioned both cards idle @ 35C avg. I think that's pretty decent.
 
Anyway I will do some testing with just Precision X installed (I have been using the latest version and never installed Riva Tuner with it)
 
Also do you have any ideas on my GPU-Z showing both my cards as 3.0 & 1.1?

I had ramping and card crashing once. Precision had a bug where if you put the computer to sleep and woke it back up the fans would be locked at 40%... Fried one of my cards when I fired up a game and didn't know about the bug. However, Maniac is correct, running Precision with another sensor monitoring program can cause this as well. 

Silly question, is it one or both fans ? I ask, because one of the members had something stuck in one fan, so it caused the other to go full speed... Maybe worth a look at the fans.

It's not just one fan, it's both. I went in the case once using a brush to softly slow them down and had to apply it to all fans.
 
As for the profile, that was one of the first things I did. It would take on the profile and increase the fan speeds based on the curve I gave it, but again randomly would go 100% even when my profile was active.
 

HeavyHemi

meroced
It's not just one fan, it's both. I went in the case once using a brush to softly slow them down and had to apply it to all fans.
 
As for the profile, that was one of the first things I did. It would take on the profile and increase the fan speeds based on the curve I gave it, but again randomly would go 100% even when my profile was active.
 

Are you using ANY other software that can monitor or change the GPU fan speeds. AIDA64, Speed Fan, Nvidia Inspector, vendor motherboard utilities etc etc.

+1
Uninstall--> HWMonitor & Speccy (BOTH of these are using the GPU sensors(!!
 
Also--> "Today my wife told me that the fans randomly went to 100% for a full 3 hours"
 
I dont think you understand how serious your problem could be..
When having these types of problems SHUT THE COMPUTER DOWN when you are not in front of it.
The potential for more loss than just the GPUs would appear to be present on your system...
 
Question: Have you run a FULL Malwarebytes (with latest updated definitions) you "could" have a Bitcoin miner infection.
While I'm 98% sure your having just a software conflict problem, a bitcoin infection should be ruled out as well.
 
 

Well then, seems there is something odd with my rig.
 
I'm currently testing the cards on a spare rig and all is normal, 11 hours in and no unusual fan speeds...
I had this feeling that there were nothing wrong with the cards, could play games without issues and the temps were normal in idle and under load.

Mr_Rust-EZZE
I have only one fan on my EVGA GeForce GTX 780 Classified run at full speed and make a lot of noise. Has the solution been found yet??

Time to contact EVGA tech support if only one fan is spinning.

Hello, I have an EVGA 780 Ti and the same problem as you. Once I install an Nvidia driver, the fans suddenly go to 100%.