The video card that you choose for your system largely depends on your requirements. If you use applications that are very heavy on the graphics, then you should consider a PCI express video card with SLI capabilities. However, if the most graphics intensive thing you plan on doing on your computer is watching a usb 3.0 pci cardDVD movie, then you don't really need one that's very powerful, any standard one should PCI Express card do. In many cases, you might even be able to make do with the card that came with your system.
If you're interested in purchasing a new video card, then it's important that you examine the current capabilities of your motherboard. usb 3.0 pci express card The older motherboards support only one graphics card at a time through an AGP slot. Motherboards today do not support AGP cards. Today, the new standard is PCI express, usb 3.0 pci card which has recently replaced AGP as the favoured graphics