I am trying t find out if there is a way my DELL E6420 can run 3 external monitors?
I currently run 2 with the laptop screen as the third using a Dell docking station. The docking station still has one VGA port available.
You will need to get a USB -> VGA adapter in order to run three monitors or a more expensive solution. These USB -> VGA Adapters usually run $50. However, they suck for anything other than business use. Even then, it feels like you're "RDPing or VNCing" into that extra monitor. It is rather laggy.
I was able to run 3 24" monitors plus the laptop screen if need be on Windows 7 with a dock:
This is similar to situations where your laptop has a VGA, DVI and/or HDMI. You can have only two monitors running at the same time. This includes the laptop screen. You could run two external monitors or laptop + vga. Other than that, get a USB to VGA adapter. They are for the desperate though. Don't get if you're expecting to watch videos or play games.
I currently have a E6420 and was hoping to have two monitors and laptop display but it was a no go. I use the SIIG USB to VGA adapter. I work with spreadsheets and web pages so I am not looking for speed so it works for what I need.
I am running WIN 7 (64) and it works well. If you want to view videos and/or play games you can use the other monitor. Performance is a bit slow when dragging across screen but it is negligible.
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