I've finally after seemingly years of tweaking can run max display setting and get between 20 - 25 FPS with standard scenery, nice smooth flight. Slightly less but acceptable with DRZ New York. My Geforce GTX 600 will output to three monitors. If I had 2 additional monitors how might that effect my FPS.

What screen resolution are you currently using and what do you plan to use in the future (with 3 monitors)? Also, using 3 monitors will put a much bigger load on your CPU. What are your system specification?

Dont be sad, but with that card (you say GTX 600... 600 is the series, even if you have the 690...) forget the 3 monitors, if you use 3 x1080p monitors you gonna get a 5760x1080 resoultion, wich is huge for that card to handle with acceptable performance, unless you want to play with mid to low settings

 

 

Earlier today I put my GTX 960 up for sale for a very good price on Ebay - not sure where you are, I'm only shipping to people in the US). I ran three 23 inch LCDs and a 55 inch 4k TV on this card for 2 years without any problem at all (30+fps in P3Dv3 and P3DV4, much better in FSX) using payware scenery and payware airliners.  CPU was an i7-4770K running at 4.5GHz.

If you're interested, the link is:  https://www.ebay.com/itm/NVIDIA-GeForce-GTX-960-4096-04G-P4-3967-KR-04GP43967KR/122919401544

 

Its an Intel I7, Asus Z97 and 16G Ram.  I planned on upgrade to a limit of around $900 or so - GTX 1070. But later. Have been typically running PMDG 737 at 1080P, 1920x1080 and happy with current frame rate.

So it seems the consensus is that its workable but I will lose some indeterminate amount of FPS or run lower display settings. 

I am running three 

Ben Q EX3200R 31.5" 16:9 Curved Free Sync Monitors

 using  a 1080ti ASUS GPU and 5960 Intel chip with 32 Gigs memory. P3D version4 works very well with med to high settings. 25 to 30 FPS

i am using Orbx addons.

2 hours ago, tomdeleo said:

Its an Intel I7

But which one and is it overclocked at all?