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so i am about to buy a new computer and i hhave little experience with desktop hard wares.
so my question is:
1) if i have a mother board with a built in VGA output, and a graphics card with one vga output, then can i use those two vga outputs for dual monitors? or do i have to have a graphics card with two outputs?
2)if i have another vacant pci card on my mother board, can i add a second graphics card with one output and use the two graphics to run dual monitors?
 

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1) if i have a mother board with a built in VGA output, and a graphics card with one vga output, then can i use those two vga outputs for dual monitors?
Most times no , the presence of a gpu usually disable the onboard video on a motherboard.

2)if i have another vacant pci card on my mother board, can i add a second graphics card with one output and use the two graphics to run dual monitors?
You could but most any cheap gpu can support dual monitor so there would be a need for two gou's.
 

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Hi jasonlee91,

Most of the videocard now a days come with two DVI-Outputs so you can connect two monitors to the videocard via DVI. Or, some videocards too come with one DVI port and one HDMI port so you can connect your monitor into the DVI port and your LCD/LED TV to the HDMI port. If your computer monitor has an HDMI port then you can connect that monitor to the HDMI port as well.

I recommend purchasing from Newegg.com - Computer Parts, PC Components, Laptop Computers, HDTV, Electronics and Cameras! for great deals and prices for computer parts.
 
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