I finally upgraded from a X58 platform to a X299 with an I9-7940X.
For kicks I tested folding on CPU and to my surprise it was posting 365k PPD. I still need to do a 24Hr test.
This may be old news for most but new news to me.
I couldn't believe it. That PPD is about on par as a GTX 970??? I think. Sure smokes GTX 580's, lol.
These modern CPU's is a nice PPD booster in addition to GPU's.
Just wanted to share. 

Cool GTX
With a 14 Core CPU are you using 10 or 12 cores for folding ?

How are you cooling the CPU, what kind of temps are you seeing ?
 
Mostly its a Wattage game.  Watt for Watt a 10 series GPU uses much less power/PPD
 
Anything older than a 900 series card caries a hefty power consumption penalty and a much lower PPD potential

I set CPU config in folding to -1 which lets the program to choose. This is with 2 GPU's also config'd and running.
HWINFO did show all cores were active and cycling between 4.0 - 4.3Mhz. The CPU is set at 4300Mhz. The folding ID Status did show 26 which means 26 Threads???
Cooling is a single loop dual pumps: 420 60mm thick rad, 280 60mm thick rad, cpu, and 2 Hydrocopper's.
CPU Temps were 63C ambient 76F.
If anyone is interested I can test further. 
 

Those numbers see right for the CPU; when I was setting up a Quad socket Intel® Xeon® Gold 6154 Processor server I did some folding tests on VMs and set them to pin to specific cores on the host CPUs and I could get ~1.3M PPD on the server; however the wattage to run the server and the CPU under that load is far to much to justify compared to say 2x GTX 1050s.