Please suggest a graphics card to run 3 monitors

I looked up your motherboard and found this:
https://www.gigabyte.com/Motherboard...ng-3-rev-10#ov

The pictures there show that you currently have a DVI port, an HDMI port, and a VGA port on your computer. In other words, you already have three video ports. Since you called your monitors "elderly", they likely have VGA ports. They may also have HDMI ports. You can use the VGA port for one of the monitors, the HDMI port for another one, and get an HDMI to DVI converter cable for the other monitor (it will need to convert a DVI output to an HDMI input). Something like this:
https://www.amazon.com/AmazonBasics-.../dp/B014I8UU2W

If you want to buy a video card, these look promising:
http://multimonitorcomputer.com/top-...-computers.php

But you won't need a video card if your computer already has the video ports I have listed above.

mrjimphelps said:

I looked up your motherboard and found this:
https://www.gigabyte.com/Motherboard...ng-3-rev-10#ov

The pictures there show that you currently have a DVI port, an HDMI port, and a VGA port on your computer. In other words, you already have three video ports. Since you called your monitors "elderly", they likely have VGA ports. They may also have HDMI ports. You can use the VGA port for one of the monitors, the HDMI port for another one, and get an HDMI to DVI converter cable for the other monitor. Something like this:
https://www.amazon.com/AmazonBasics-.../dp/B014I8UU2W

If you want to buy a video card, these look promising:
http://multimonitorcomputer.com/top-...-computers.php

But you won't need a video card if your computer already has the video ports I have listed above.

EDIT, mea culpa: Just had a look, the monitors appear to have one VGA port and one 24 pin DVI port. If I could have done your trick would the OS be clever enough to allow different things to be placed on individual monitors though? Intriguing! Thanks for the reply :)

Basil said:

EDIT, mea culpa: Just had a look, the monitors appear to have one VGA port and one 24 pin DVI port. If I could have done your trick would the OS be clever enough to allow different things to be placed on individual monitors though? Intriguing! Thanks for the reply :)

If each monitor has a VGA port and a DVI port, you could get a DVI-to-HDMI converter cable (the opposite of what I described above) to connect the third monitor to the computer's HDMI port. Both HDMI and DVI are hi-resolution digital video, so you can easily convert from one to the other.

In this scenario, you will tell the OS that your left monitor is the primary monitor, and that the display should be extended to each of the other two monitors. You will then have, in effect, one super-wide display distributed over three separate monitors.

In case the two extended monitors are reversed from what they need to be, the easiest way to fix it is to unplug the cable from each of those monitors and then plug each of those two cables into the other monitor. (If you aren't sure of what I just said, then don't worry about it.)

Hopefully all three of your video ports have the needed drivers installed in Windows.