I have a 23" LED now and wonder...How much of a FPS loss would I get if I add a second monitor to my GTX 780 (if I recall it's a 3 gig)?  

 

I have an 4770k at 4.7 ghz / 250 gig SSD / ASRock Z97.

ok i have to ask this...i currently tun a dual monitor setup...will i get more FPS from using just one? Im a bit noobish when it comes to this. It certainly is nice to have my Plan G on one monitor and P3D on the other, but i will gladly sacrifice this if if gets me a noticeable jump in FPS.

OK...i am running 4 monitors of a GTX670oc card and NO PROBLEMS at all with frame rate loss...

 

I am betting you wont notice any difference.... my set up is 2 x 27 inch linked as one and then 2 x 18" below for my gauges...

 

I also run iDisplay on my ipad for the MCDU which i run...

 

With grunty cards like that and powerful CPU i am thinking yo will see negligible frame loss... and so long as the sim is smooth, the frame rate itself is pointless.... been down that treadmill for years... smoothness is the key

More monitor means higher resolution. Yes, basically you'll loose fps if you increase resolution. I gave it up triple monitor setup and bought big lcd tv for p3d. It was cheaper than upgrading cpu, gpu etc.

Depends on the resolution you are running the sim in. More pixels to compute means higher CPU/GPU load, leads to FPS loss.

 

In other terms:

- if you use your second monitor for Plan G and keep your sim on only the first monitor, there is no difference in FPS to a single monitor setup.

- But if you stretch the sim window over two monitors, the system has twice the amout of pixels to consider, more objects are visible in the sim at the same time that need to be computed and you have a slight overhead for the system actually managing the two or more monitor display (Nvidia surround needs some CPU cycles too...).

 

I'm running a 3 screen surround setup and it has noticably lower FPS than single monitor, especially in complex VCs with a lot of displays and dials.

I have a 23" LED now and wonder...How much of a FPS loss would I get if I add a second monitor to my GTX 780 (if I recall it's a 3 gig)?  

 

I have an 4770k at 4.7 ghz / 250 gig SSD / ASRock Z97.

 

I run almost the same setup as you. 4770K at 4.6 GHz and a GTX780. I use a triple monitor setup with nVIDIA Surround at 5910x1080 plus a fourth monitor for pop-up gauges. Going from one monitor to three monitors leads to a frame drop of 7-10 fps on average (never more than 10 fps). I still get 30+ fps in most situations so it is absolutely no problem for me. When flying GA I still have 60 fps even on three monitors. When I switched from one monitor to three I had the same worries that it might be extremely hard on the frames. But it's not. And it is absolutely worth it, because the immersion is a thousand times better with the larger field of view. Instead of using multiple monitors you could also buy one large 4K TV. However, this is even harder on the frames because 4K has four times the pixels that Full HD has.

I'm using 2 monitors as well, but one for my main outside view from the VC and one with a panel view, showing the basic 6 part of the VC panel (since 2D panels arent commonly used anymore)

In this setup, I'm running 2 full VC views on top of each other, so the system has to render the VC and scenery twice. If this is what you're planning to do, you have to count that the frame rate will be half what you get with one monitor.

 

I'm running a 4770k @ 4.3GHz with GTX780 and I still can keep my framerate above 20FPS in a heavy workload areas, running ASNext with 2 layers. In situations where the workload from scenery isnt that heavy., I can easily run 3 cloud layers and still hit 30FPS or more.

2 monitors here, and i see no fps loss at all 

I see this got moved, so should of added I'm on P3D.  It sounds like technology has improved since I last used  more than one monitor, sounds like I need to try...

 

Now to figure out how to get an old  50+ pound 19" monitor from the basement to upstairs (I have bad back and really cannot lift anything over 20 pounds).  In the past I rigged a pulley type system to lower a dehumidifer down the stairs...  There's actually two of them down there.