Vid cards and SLI do you need it ?

Hey guys whats the reason for having two vid cards in sli is it so you can have two moniters or does it increase the performance or something
I'm planing on getting a http://www.newegg.com/Product/Product.asp?Item=N82E16814130237
and wanted to know why people are talking about it in sli so much.

|so you can have two moniters
Quite the opposite, in fact - SLI only works on a single monitor output. It's for the performance increase. And e-penis enlargement, of course.

cards in sli use a bridge to share the processing load, if you need it or not is really up to you and what you plan to do with it

ok thanks, but do you just plug your monitor into one of them or is there an adapter or somthing? I've never used or seen up close
an SLI configuration.

>>4

i've never used/seen one either but i would think you set one of them as the primary and that one would be where you input your stuff

The bridge between the two cards is just a small ribbon cable.  I assume the distribution of GPU load is managed by the drivers.  Other than that, just plug the monitor(s) into a VGA or DVI port on the first card.  I don't know if it actually matters which you plug it into, but if its anything like a multi-card system, you'd plug it into the "first" port on the primary card.

>>6
ok thanks that helps alot, I dont think I need to put two eVGA 256-P2-N529-AX Geforce 7800GTX 256MB GDDR3 PCI Express x16 Video Cards into sli I think one will do fine .