Both your graphics card and your processor are much lower than ours.
To start with, you have an old i7 (2000 series) i have the latest i7 (7000 series), and i assume Amens i5 is at least a 6000 series, there is a huge difference in performance between them and yours.
As to graphics a big mistake people make with NVidia is thinking the higher the number the better the card, this isn't always the case.
The first number, in your case 9, just tells you what series the card is, basically how new the card is, unless there are major changes in the technology on a new series then it's only of secondary importance. The number you really want to take note of is the second part, in your case the 50, this tells you what type of graphics card it is, this number usually goes up in stages from 10 to 80 and is very important to take note of when choosing.
This is a very rough guideline, it's not always the case, but it's close enough:
x10 to x40 are generally mainly for web browsing, office work, and very very low end games
x50 is for very low to low end gaming
x60 is for low to medium end gaming
x70 is for medium to high end gaming
x80 is for high to extreme gaming
Because there is two numbers to think about when choosing a card it can be a little confusing, because you would expect a 950 to be better than a 780 because it's a newer card, but in reality a 780 actually beats a 950 at most tasks, obviously the bigger the gap between the series the less the difference is.
A 950 is actually the equivalent of a 760 or a 660ti, a 960 is roughly the equivalent of a 670 or a 580, and likewise a 970 is actually pretty close in speed and power to a 1060.
This is also a major reason people can't play some games very well, and why they flip out because they think they meet the requirements, a game might say "minimums graphics 780" and people think "ooh i've got a 950, my cards much better!" then suddenly after buying the game they say "hold on why am i only getting 20fps?", and flip out at the publisher, what they don't realize is that they don't actually meet the requirements at all, they just don't understand how the numbers work. That's one of the reasons when people say "i meet the requirements" on tech reports we always ask them to list their specs, because sometimes they think they meet the requirements, but actually don't.
and yes, using three monitors on a graphics card can cause its performance to lower.
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.