SLI / NVidia Surround

[MonkGF]

I am interested in going to a 3-monitor Surround setup as I redo my desk space. I currently have an XFX GTX 285 1GB card in the system, but it has been discontinued:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814150334

Since I need to go SLI to do the 3-monitor setup, and this will be the first time I've gone SLI, I'm wondering about my options. Will another similar 285 card work, or do they need to be / should they be the same card?

[Chalenge]

Same chip different manufacturers will not matter but make sure the memory size is the same.

EDIT: http://www.slizone.com/page/slizone_faq.html#c17

[Tigger29]

Also make sure of the obvious.. you need a motherboard that supports it as well (with at least two PCI-e full length slots).

[MonkGF]

Same chip different manufacturers will not matter but make sure the memory size is the same.

EDIT: http://www.slizone.com/page/slizone_faq.html#c17

Thanks, and a headslap for me for not looking for that link.