If your motherboard has a VGA connection, that means it has an onboard video chipset and no you do not need to buy a dedicated video card unless you want to play more modern games or are using any other program that requires a dedicated gfx processor.
Yes, you can. The motherboard is equipped with a PCI-e port so you can plug in a graphics card.
If your motherboard already has a VGA port, you do not need an additional graphics card. However, depending upon what you plan to do with your computer you may want one. Some motherboards come with fairly low-end graphics chipsets so if you plan to do much gaming, 3-d graphics or the like, you may find the onboard video is insufficient. The good news is that you can always add one on later if you discover you need one.
It is the Accelerated Graphics Port on a motherboard for attaching graphics cards.
NForce 590 sli motherboard will work with such card as far as it has an appropriate port (PCI-E).
Older motherboards often have a VGA port which allow monitors with a VGA cable to connect without the need of a graphics card.
yes, if your motherboard supports crossfire and your graphics cards support eyefinity (at least 3 of your monitors will need to support display port, or you will need to purchase active adapters for them)
The Accellerated Graphics Port card uses memory completely separate from the motherboard memory. They don't mix. Make sure you use the memory that the AGP card nees in the AGP card, and memory that the motheroboard needs in the motherboard. If you do that, everything will be ok.
Yes the PC will still run, however if the motherboard does not have an onboard video port you will not have any video at all..
it is a port or a connection for a graphics card. It is the second version of PCI express with a speed of x16. To use a graphics card with this, you will need a PCIe 2.0 x16 port on your motherboard. Most modern motherboards have this.
The expansion card
A Graphics Card
You can replace your LAN port with a wireless card if you have an ASUS P9X79 motherboard. However, it's a better idea to get a card that fits in a USB port so you can keep your LAN port.