Hi sorry to ask this but im not computer savvy at all( console player ) but i just bought me a pc from cbyerpowerpc and if i wanted to us 2 video cards how does that work, do they have to be the same brand and what advantages do they give over just one single card
First: Your motherboard has to support SLI (nVidia) or Crossfire (Radeon).
Second: You need a power supply that's good enough to handle both cards.
Third: They do need to be the same type of card (Both nVidia or both Radeon)
SLI: You can use two cards from different manufacturers (e.g.: EVGA and PNY) but they HAVE to be the same model (both GTX 460 or both GTX 475 or both GTX 260), you can't mix a GTX 465 with a GTX 460 for example.
Crossfire: They have to be from the same revision line (e.g. two 5770s or a 5770 and a 5750 or a 5830 and a 5850 or two 5870s). You can't mix a 5770 with a 5830 for example.
There's a connector that bridges the two cards that needs to be plugged in to both to make it work. Usually comes with the cards.
They do provide advantages in the form of increased speed and processing power, but they do not literally double the speed. The increase in performance is roughly 25-60% give or take. Depends on a lot of factors. Edited, Jul 29th 2010 12:27am by Mikhalia