For many PC gaming enthusiasts, the idea of having a dual graphics card setup is a mouthwatering prospect. However, while installing a graphics card as a stand-alone is relatively easy, installing a second card is a little more complicated.
Many PC users know how to install a graphics card, but when it comes to setting up your system in order to utilize a second graphics card, things can get a little trickier. But whether you are setting up a ATI Crossfire system or a Nvidia SLI system, the procedure is pretty much the same.
It's a fact that SLI and Crossfire are identical in concept, but in practice they do differ from one another. Because of the technologies involved, it isn't possible to mix-and-match graphics cards from the two, so you can't pair a ATI graphics card and a Nvidia graphics card together, nor can you run two Nvidia cards on a ATI Crossfire compatible motherboard. So, it's important to bear a few things in mind when considering making the jump to a dual graphics card system.
CPU-Z will be able to report on your motherboard model and manufacturer. Make a note of the reported chipset and visit the manufacturer's website to find out whether or not your motherboard can support dual graphics cards. Even though your motherboard may have two PCI Express x16 slots, it doesn't necessarily follow that you're system supports either dual card format.
Inspect the internals of your system. Firstly, check that there is sufficient room in your PC to house a second card and ensure that the second PCI Express x16 slot isn't obstructed by cables or other hardware. Graphics cards can be quite lengthy and those that are fitted with large heatsinks can take up two expansion slots.
Check that your power supply can provide enough juice to power your dual card system. Although some power supply manufacturers have certified their power supplies to be compliant with dual card systems, check the specifications of the power supply in your system. Ideally, the power supply should provide at least 500 watts of power, but it's wise to check the exact power requirements for your SLI or Crossfire setup. Also check that your power supply has a suitable spare connector should your graphics card require one.