And the GTX Titan and Double Precision Setting Turned on.  WOW! is a start, 4 Minutes or Less to complete a task.
 
app_config.xml Files
 
Both Cards Run 10 Tasks Per GPU at about 99% of GPU Usage and 10% CPU Usage.
20 Total Tasks Running. A little over 5 Minutes to complete a task
 
<app_config>
   <app>
     <name>milkyway</name>
     <gpu_versions>
         <gpu_usage>0.1</gpu_usage>
         <cpu_usage>0.2</cpu_usage>
     </gpu_versions>
   </app>
   <app>
     <name>milkyway_separation__modified_fit</name>
     <gpu_versions>
         <gpu_usage>0.1</gpu_usage>
         <cpu_usage>0.2</cpu_usage>
     </gpu_versions>
   </app>
</app_config>
 
Card 1)  This one runs 5 Tasks Per GPU at about 60-70% of GPU Usage and 1% CPU Usage.
Card 2)  This one runs 4 Tasks Per GPU at about 60-70% of GPU Usage and 1% CPU Usage.
9 Total Tasks Running. 4 Minutes or Less to complete a task
 
<app_config>
   <app>
     <name>milkyway</name>
     <gpu_versions>
         <gpu_usage>0.2</gpu_usage>
         <cpu_usage>0.2</cpu_usage>
     </gpu_versions>
   </app>
   <app>
     <name>milkyway_separation__modified_fit</name>
     <gpu_versions>
         <gpu_usage>0.2</gpu_usage>
         <cpu_usage>0.2</cpu_usage>
     </gpu_versions>
   </app>
</app_config>
 
This applies only to the GTX Titan Graphics Cards that Support "Double Precision" I found that the newer Titans Do Not Support "Double Precision"
 
I have tested all the Other GPU BOINC and Even Folding Tasks and non can use the Double Precision Settings of a GTX Titan.

Yes under the NVIDIA Control Panel

 
I never did get my AMD R9 290x to run this Program.

As far as I know Only the Titans and Titan Blacks have it, the Titan X is when they Dropped it for what ever reason I do not know.
The Titan Z did have Double Precision.
Maybe because of this "single-precision GPU for gaming" is faster and the GeForce Cards are Gaming Cards.

I think the GTX780 and 780Ti could do DP. I think they gimped DP when they went to the next generation. they wanted to sell special "Work station" cards for DP
The mainstream cards were to be for gammers.
I think AMD gimped DP after the R9-290 to sll their workstation cards too, but I think they put it back in after a couple models.

This is the app_config.xml File I ended up with on my Titans With Double Precision Enabled.
Starting to have to many Validation inconclusive with a Settings of 0.1 | 0.1 and even 0.2 | 0.2
 
<app_config>
   <app>
     <name>milkyway</name>
     <gpu_versions>
         <gpu_usage>0.25</gpu_usage>
         <cpu_usage>0.25</cpu_usage>
     </gpu_versions>
   </app>
   <app>
     <name>milkyway_separation__modified_fit</name>
     <gpu_versions>
         <gpu_usage>0.25</gpu_usage>
         <cpu_usage>0.25</cpu_usage>
     </gpu_versions>
   </app>
</app_config>
 

cuarc001
I think the DP cards with nVidia started with Fermi around the GT520/GT430 cards era. However AMD smoked them in DP with every generation. As mentioned above, nVidia started gimping DP in the non-Quadro cards even worse because of the markets. Most applications don't/can't use double precision. So, no incentive to cut into the Quadro markets.

I cannot even run MilkyWay @ Home on my AMD Cards, at least I have never got my AMD 290X to run them.
Well at least for now my Titans run ok.

bcavnaugh

cuarc001
I think the DP cards with nVidia started with Fermi around the GT520/GT430 cards era. However AMD smoked them in DP with every generation. As mentioned above, nVidia started gimping DP in the non-Quadro cards even worse because of the markets. Most applications don't/can't use double precision. So, no incentive to cut into the Quadro markets.

I cannot even run MilkyWay @ Home on my AMD Cards, at least I have never got my AMD 290X to run them.
Well at least for now my Titans run ok.

7970's were king for a very long time because of DP. I did not keep up if any cards dethroned them. I'm sure from a price point it's probably still up there.

bcavnaugh
They do run Hot when set to 0.1 NOTE: You can overclock the Memory But NOT the GPU when you enable "Double Precision"

This is from a while ago, Bill you said " can't overclock the Titan with DP enabled.
I have DP enabled and +145 with afterburner and the Titan is running around 1096 or so, just under 1100
She is cranking out 8 tasks at 102% or so 277 seconds if I remember right  4:35.