Pause the Client Software and Save and then Exit it.
Delete your GPUs.txt file from the Folder ProgramData\FAHClient\
Start the Client Software back up it will download a new GPUs.txt file.
 
Please Post an Image of the Client Software showing what you are Folding on.

Are you folding both cards or just the 780ti?

Sometimes Folding swaps GPU labels on auto configured cards. So, it may be a folding identification glitch using the wrong card.

Cool GTX

ipkha
Sometimes Folding swaps GPU labels on auto configured cards. So, it may be a folding identification glitch using the wrong card.

+1
 
My Rig1 has the cards mixed

This^^^
Make sure the other card is not folding instead.
 
Sometimes a restart will get it to ramp up again.
For example, logging in with Teamviewer sometimes makes my gpu run at idle clock speed when folding.  I restart and it ramps up again.

My trick to get boost clocks on my 1080 is tied pause a YouTube video in chrome. It generally bumps my clocks to boost levels, but can be intermittent. Usually I never see below base clock unless at the transition points. Hitting a glitch can sometimes kick you gpu into safety clocks and I've seen that sometimes as well on my 970 and 760 when pushing clocks too high in games. The driver would crash and it'd get stuck at 535Mhz or so.

Do you have a 4 Core or 8 Thread CPU?
You need One Core or One Thread Free for each GPU.
By the way your GTX 580 is going to get very low PPD now.
You may want to also think about Not Folding on your CPU and get all the Power to your GPUs.
 
I would go back to Driver 373.06 if this is a Folding Only Computer.
This might still be a problem for some, about the New Core 21
"While a slight reduction in performance may be observed, this performance regression should be eliminated when NVIDIA removes the hotfix in forthcoming driver updates."

bcavnaugh
Do you have a 4 Core or 8 Thread CPU?
You need One Core or One Thread Free for each GPU.
By the way your GTX 580 is going to get very low PPD now.
You may want to also think about Not Folding on your CPU and get all the Power to your GPUs.
 
I would go back to Driver 373.06 if this is a Folding Only Computer.
This might still be a problem for some, about the New Core 21
"While a slight reduction in performance may be observed, this performance regression should be eliminated when NVIDIA removes the hotfix in forthcoming driver updates."

^^ +1
It looks like you are running the newer drivers, with the core 21 0n the 580. I would remove the CPU slot from folding . The {CPU} PPD vs electric cost is not worth it ,IMO. 

Cool GTX
As you have two different GPU it would be very Odd --But, is SLI Off ?  The newer drivers from Nvidia turn it on
 
Set to performance in Nvidia Control Panel & OS

Believe it or not I removed all my SLI Bridges because of this.

I think that both GPU WUs are running on your GTX580 and that could be the reason why your GTX780 Ti is running idle.
Looking at your FAHControl screenshot, I noticed the low PPD on both GPU slots (I've used the Project and Credit info to calculate the PPDs).
Total is ~61k PPD: CPU is ~14k, 580 is ~29k and 780Ti is ~18k.
When I combine both GPUs it's ~47k PPD, which seems to be the "normal" PPD of a single GTX580.
 
You can test this by pausing Slot 02, which is labeled as your GTX 780Ti (but would be the 580), and see if your 580 load is dropping or not. When the 580 still keeps running then you can monitor the TPF of the WU that is running and see if the TPF is decreasing (and PPD is increasing).  When the PPD goes up (lower TPF) it's a sign that both WUs were running on the 580 and I would set your running Slot 01 to Finish the WU and after it's finished set it to Pause and you could unpause ("Fold") your Slot 02 and also set it to Finish the WU.  (Edit: To be sure a little quicker, you can also start folding on Slot 02 again and Pause Slot 01 to see if it's also folding on the 580)
 
Assuming both GPU WUs are running on your 580; I don't know if you have tried to manually set your gpu-index, opencl-index and cuda-index fields of your GPUs or that there could be something wrong with your FaHClient?  If you have manually set your GPUs indexes, can you share your settings or post the first part of your FAHLog with your system and configuration info.
 
Edit-2:
Just another thought, could it be possible that you are folding on your integrated GPU (Intel HD Graphics 4600, which is not official supported by FaH) instead of the 780 Ti?  I think that only could be possible if you have set (manually) the GPU indexes incorrectly though.

notfordman
 
 The {CPU} PPD vs electric cost is not worth it ,IMO. 

I would say the same for both GPU's as well....  580 & 780 Ti both use about the same amount of electricity, which is about 28% higher than a GTX 1070 Founders Edition, but the 780 TI is beaten in Folding and in gaming by a 1060 6GB which uses about 32% less electricity & the 580 is absolutely horrendous in ppd with current work units.   A single 1060 6GB card has potential to out produce both cards combined while reducing total power consumption 70-80% at the same time - much lower electric bill could mean more future upgrades....
 
OP, if doable, your best bet would be to sell both cards & buy just one card, either a 1060 6GB version, 1070, or 1080 depending on how much you can afford after selling the other two.  
 
Quick rundown of your current cards vs proposed cards....
GTX 580 = 30,000 - 55,000 ppd depending on WU & core speed.  GPU power usage (not system power usage) under maximum stress in Furmark, typically more than 225 watts & over 250 Watts with modest overclock.
GTX 780 TI = 200,000 - 350,000 ppd depending on WU & core speed.  GPU power usage (not system power usage) under maximum stress in Furmark, typically more than 225 watts & over 250 Watts with modest overclock.
GTX 1060 6GB = 350,000 - 440,000 ppd depending on WU & core speed.  GPU power usage (not system power usage) under maximum stress in Furmark, typically less than 200 watts when overclocked to 2Ghz  
GTX 1070 = 400,000 - 900,000 ppd depending on WU & core speed.    GPU power usage (not system power usage)under maximum stress in Furmark, typically less than 210 watts @ stock clock
GTX 1080 = 600,000 - 1mil+ ppd depending on WU & core speed.   GPU power usage (not system power usage) under maximum stress in Furmark, typically around 210 watts @ stock clock
 
 
Rough savings estimate with one GTX 1060 6GB overclocked to 2,016Mhz boost clock = $415 to $530 per year @ 13.5 cents per kilowatt hour if current system is run 24/7.... enough to buy a GTX 1070!!!
 
PPD estimates partially formed using data pulled from GPU Folding Projects Performance spreadsheet on google docs
 

ThorbansI would get a 1080 but last time I upgraded everything 4 months later everything equipment wise updated and I have been holding out for a 1080Ti so I haven't bought one.

1080 Ti might be officially 'launched' in just 4 days....